Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 94 SL500, was low on gas and on the way to the

Customer Question
station it started to loose...
i have a 94 SL500, was low on gas and on the way to the station it started to loose power, pushing down the gas peddle almost to the floor kept it running for 100 yards but then it died. It cranks but won't start, I can almost start it by pressing the gas pedal to the floor but after 20 seconds it of cranking and almost starting it dies. I checked fuel pressure during cranking and its at 50 to 60 PSI. Checked to see if I had spark and it does. if I have spark and fuel then thought oxygen could be the problem. I have ordered a new Oxygen sensor along with new CPS's. The CSP's arrived without the O2 sensor. I installed the CSP's but still won't start. should get the O2 sensor today but I'm not optimistic. Any help would be appreciated.
Submitted: 2 years ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 58 minutes by:
1/29/2016
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,016
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
Verified

hello, so how is the flow of fuel ? does it come out of the fuel rail at a good rate of flow?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I haven't done any visual inspections of the fuel flow. I have a pressure gauge and assumed the flow would be adequate if the pressure was nearly 60PSI. How should I test this, remove an injector?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

no, does your fuel gauge have a button to release the pressure? if you do then hold the button down to allow fuel to flow out and into a bucket of sorts, and crank the car while holding to see how much flow comes out. pressure is not relative to flow.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
It does have a pressure release button and attached tube. Let me do that test and I will be back with you. I need a few minutes.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok let me know. :)

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I tested it with the release button pushed. The pressure remained at 40 psi through cranking and pushed about 2 to 3 oz of gas
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, do you have starter fluid to spray to see if it will start with starter fluid?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I tried that and it does not work.
Customer reply replied 2 years ago
I didnt want a call just the next suggestion.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok so the car does not start off of starter fluid ?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
It does not start when I spray starter fluid in the MAF
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok then you have no spark. BUT just to re confirm. You ran out of gas then put gas in it. And then this happened Right?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
no, I didn't run out of gas, the reserve light had not yet turned on. Also, I have checked to see if I have a spark by pulling off one of the wires to one of the cylinder plugs and putting a new plug into the loose wire that is still connected to the distributor. It sparks on a regular interval.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok well if the car does not run off of starter fluid then that tells me the spark is not enough or the plugs are fouled. I suggest remove a few plugs and check for wetness on them after trying to start it about 4 times. If it does not run on starter fluid then we're after spark.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Ok, I'm on it. I will let you know shortly.
Customer reply replied 2 years ago
the plugs are moist with gas.
Customer reply replied 2 years ago
The plugs were changed less than one month ago, so they are not coated with excess carbon.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok so we know we are at least getting gas. So it's one of two things. Weak spark or bad gas. So clean all the plugs. Then while they are out. Crank the engine a few seconds so it clears the cylinders. Then put only one plug into the wire or coil and lay it against the block to see if it sparks wen it cranks. If it does then reinsert the plugs and see if it starts.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
should I do this for all 8 cylinders?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Yes. Tedious I know lol but it needs to be Done

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
ok
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Done. Each plug sparked. after doing all 8 it still won't start. it doesn't get close to starting until I floor the gas pedal and one time it started for 2 seconds then after that it would only get very close to starting but doesn't.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, so what happens when you floor it is the computer actually cuts out fuel delivery , so your gas may be the issue., go ahead and pull out just one plug and check it. see if its wet

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
it is wet.
Customer reply replied 2 years ago
I actually pulled 2 plugs and both are wet, one is clean gas and the other looks dirty, not the color of oil but dark.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok so i think we have a fuel issue, do you know where the fuel pump relay is at?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I do. In fact I changed the fuel pump and canister filter 20K miles ago. I didnt touch the filter that is part of the fuel drain plug though and I have never drained the fuel tank of any sediment.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok so pull the fuel pump relay out.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
ok its out
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok now crank the car and verify no fuel pressure at the rail

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
there is still 58PSI at the rail
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

then the fuel pump relay was not pulled. is it green? ill check the location, if it is pulled then bleed it of with your tool and see if it comes back up.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
its green with a 30amp fuse in the top. it is located behind the bank of fuses for the rest of the electrical system. I did bleed the pressure gauge and it came up to 58 psi again. I will repeat and see if it is the same
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok its on the passenger side of the trunk behind the panelling is what i am seeing, near the battery

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

that is the one. and you still have fuel pump activation?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
apparently so.
Customer reply replied 2 years ago
what next?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok sorry, disconnect the fuel pump(s)

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

what we need to do is stop fuel flow so we can see if the car will run off of starter fluid. or let me see if there is a fuse for the fuel injectors.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok there is no fuse, so either unhook the fuel pump grounds or unplug all the injectors, i think we may be working with bad gas

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I unplugged all of the fuel injectors then sprayed some starter fluid in the MAF and it started for 1 second and as I crank it almost starts like it did before when I was flooring the gas pedal. the fuel gauge still reads 60psi in the rail. What do you think?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok so do you have someone to help to keep spraying starter fluid little at a time so to see if it keeps running ?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

And also I want you to get a fuel sample into a glass jar. And let it set and see if it separates. I think you have bad fuel.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
unfortunately it doesn't start when I have someone crank it while I squirt starter fluid in. I am trying to get the sample of gas now. I assume you want it directly from the tank, right. Not from the pressure gauge after it has been filtered.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

No from the Guage is fine water will not filter in the filter.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
The gas is mostly the same constancy (viscosity), but at the very bottom their is a 1/32 of an inch that is another layer. Does water appear at the top or bottom?
Customer reply replied 2 years ago
I have a 1/2 bottle of SeaFoam. should I pour that in or simply drain the tank and put fresh premium in?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Gas floats on water. That is water. That is the issue. You will need to drain the tank. Then clean or replace the plugs and fill with fresh fuel and some heet additive. That's the issue my man. Good work !

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
got it! Thank you!
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

No problem ! Please take a second and click the box and rate my service GOOD OR EXCELLENT SERVICE if you feel I have been helpful and please request me in the future. If you feel I have not been helpful please DO NOT RATE BAD OR POOR AND WASTE YOUR MONEY , I will opt out to see if another expert can provide more or better assistance so you're not wasting your money!!. Thanks for choosing just answer. Lou. also , if you feel i deserve one , BONUSES are GREATLY APPRECIATED ! 😉

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I am draining the tank now but I want to be sure I understand. i have about 6 oz of gas in a glass. at the bottom of the glass their is 1/32 of an inch that appears to be a clear but separate liquid. i am sure i don't have 5 and 3/4 oz of water and a small bit of gas. if water floats I don't think this is water. I will let you know how things go after I purge the old gas and replace with treated gas.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

No it's gas at the top and water at the bottom.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Either that or you have a mixture of gas and diesel

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

And just because it's separated in the glass does not mean it separated in the tank it will mix and that's what will cause the engine to not run and the plugs be soaked

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I drained the tank, put 10 gallons of Premium chevron gas with a 1/3 bottle of Sea Foam and then cranked it and pressed the release value on my pressure gauge and ran a half a quart through into a bucket, cleaned all the plugs and tried to start it. It tried to start but only if I press the pedal to the floor. I ran some more gas into a cup to make sure no water or other was in the gas and it looks clean but still won't start. Any thoughts?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

yes, your car is the devil, no seriously, let me think on this a sec.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

you plugged the fuel injectors back in correct?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

and you probably need to check the plugs once again to make sure., now that we have fresh fuel , if the plugs are wet we know we have a spark issue. we can have spark but it be weak , you should have individual coils so its hard for me to believe we have a spark issue, but we need to rule that out, man i was for sure we had a fuel issue. sorry for the time spent .

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Ok, I need to run some errands. Ill check the plugs and then the coils, what should be the output of each coil?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

We don't have specs to ohm coils. What you can do is plug the plugs into the coils and lay them on the head and crank and see if they are all sparking.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I have tested both coils by removing the center wire on each distributor, putting a plug in the wire and setting that on the block. In each case the plug fires in rapid succession. Whats next?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, unplug the mass air flow sensor,. its the big round sensor in the middle of the engine, it will have a round plug on it i believe, it will not be easy to unplug but it needs to be .

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
ok done
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK see if the car will start. of course if all the plugs and coils are back in

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
it it hard but I starts for about 10 seconds, again only when I floor the gas pedal
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK, try again with the injectors unplugged .

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

and when it does start with the pedal floored does it run well or does it just start and die ? what does it do?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

WOULD you be up for a phone chat? I think we can clear some of this up faster for both of us. i will be available to chat after 5pm central time. i can send over the offer.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
ok, tried starting it without injectors and it would not even come close to starting. When I started it with just the MAF sensor unplugged it start after cranking for 10-15 seconds, it builds up to it then starts all while I am flooring the pedal. When it starts it sputters for a few or last time 10 seconds. it does not and idle then die.
Customer reply replied 2 years ago
it does not start and idle then die. sorry
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK , mass air plugged back in, injectors plugged back in, plugs and coils all installed, make sure fuel pump relay is in and also fuel pumps are connected (not sure if you ever disconnected.) then turn key on, wait 5 seconds, turn key off wait 5 seconds, turn key on wait 5 seconds turn key off wait 5 seconds, repeat about 10 times, then see if it starts without pressing the gas pedal.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Ok, I plugged everything back in and tried the on/off key sequence. it almost started but didn't. I then tried to start it by pressing the pedal down and it would not start. I repeated the key sequence again but this 2nd time it didn't come close to starting.
Sorry this is so much trouble. What should I do next?
Customer reply replied 2 years ago
Any thoughts?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

well, even though we have good pressure, i think the flow may be a issue, so far we concluded that fuel and spark are ok, so it must be a lack of fuel,. but first i want you to see about getting a noid light to plug into the injectors so we can verify the injectors are firing when cranking. you can buy or rent from a autozone.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Ok, I checked each injector harness plug and the light flashed at regular intervals on all eight.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, what the hell is going on lol. we have spark, and fuel......... ok do you have a second person to help you?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, have someone crank it while you plug the exhaust to see if you have air flow. it should make some decent pressure. use rags or towels.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I plugged it with a towel but couldn't tell if much so I covered each exhaust with my hand/plastic glove and felt airflow but not a ton.BTW, I would like to work through all possible ideas and testing through the day and if we need to do a call after 5:00pm Central time, I am ok with that, unless we fix it before.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, i am just running out of ideas here. none of this adds up. we are missing something.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Could it have something to do with the Engine Management System? The Bosch LH/EZL Computerized Engine Control System and/or the Advanced electronic control units (ECU)
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

yes BUT with the car cranking and injecting, it doesnt make sense. at this point it will have to be scanned with a scan tool to see what values the computer is seeing while its cranking. to me it sounds like a electrical or sensor issue. i dont think we can do anymore at this point without a scan tool.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
my 94 doesn't is pre-OBDII. I have a X11/4 round port that there are scan tools for but I don't have one and I believer they are hard to find. I do haver a scan tool i built from some radio shack parts that can read the codes via blinking lights. have you ever heard of this type of a scan tool? see attached files.I did read the codes prior to starting and here are the results:Port 6 - 26 blinks = Upshift delay 1 to 2 (model 123.034) , 2 to 3 (all models)
Port 7 - 2 blinks = Heated Oxygen sensor inoperative
Port 8 - 6 blinks = Idle speed control inoperative
Port 17 - 8 blinks = Engine coolant temperature sensor, open/short
Port 19 - 3 blinks = Lambda control inoperative
Port 21 - 6 blinks = Idle speed control inoperative
Port 22 - 2 blinks = Heated Oxygen sensor inoperative
Port 23 - 15 blinks = Wide open throttle information defective
Port 30 - 2 blinks = Heated Oxygen sensor inoperative
Port 31 - 2 blinks = TN-signal (rpm) at LH-SFI control module (N3/1) defective
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

yes sir, its what we used in the shop until the computer system came out. i like the coolant temp code ! that could be a issue, also i forgot a very vital piece of info, have you heard of the wiring harness issue? if you move your wiring harness does the insulation of the wires crack off??

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Great, I want to make sure I captured all of the codes and blinks properly. I had good instructions how to build the scan tool but not on how to use it. After turning the ignition on so all the lights appear on the dash, I put the Red wire in the port 3 and black in port 1, then I take turns placing the yellow wire in all the other ports and recording the blinks. Is that correct?
Customer reply replied 2 years ago
Also, yes I am unfortunately aware of the wiring harness issue with Mercedes 1990 to 1998 harnesses. I do not yet have a content ASR issue so I have not replaced the harness (very expensive anyway) Could the harness cause these starting issues I am experiencing or is it more tied to the ASR randomly coming on?
Customer reply replied 2 years ago
BTW, I purchased and replaced the temperature sensor and both CSP sensors. I have also purchased a new Bosch Oxygen sensor but have not replace it yet.
Customer reply replied 2 years ago
Also, the last item i listed above was actually 11 blinks not 2 but the diagnostic was correct see below:Port 31 - 11 blinks = TN-signal (rpm) at LH-SFI control module (N3/1) defective
Customer reply replied 2 years ago
OK sorry for over loading you with all of that info. What is my next step???
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok yes overload haha. Next step is to check the wiring for cracking. Did you find any bare wires anywhere ?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
It doesn't appear to be full of cracked or falling apart wire insulation
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok. Well that's a good sign. I'm out of ideas. Even though we have codes they don't mean nothing without seeing some actual values , codes are helpful in a sense but I'm not sure we can diagnose this here. At least I can't. If you wish we can stop now and you can have a shop look at it? Or I can opt out and see if another expert can help. But I am out of ideas at this point and don't want to guess at anything. I appreciate your Patience. Let me know how you wish to proceed.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
i am unfortunately not in a position to spend a ton of money on a shop right now. I would really appreciate you sending me to another expert. One that you believe is he best and willing to go through this one step at a time again. Thank you again and I really appreciate your help!
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok I wish you the best. Good luck.

Ask Your Own Mercedes Question
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1,532
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
Verified

Hi there. Expert Lou P. is one of our best and, as such, a tough act to follow. He's basically touched on every possible cause for the existing condition. The only thing I can think of adding would be to check the injector pulse signal in case the LH-SFI has gone bunkers and is keeping the injectors open by constantly grounding them - other than that I just couldn't explain why the spark plugs are getting wet.

Would it be possible for you to rig an LED or get a Noid light (less than $20 at most auto parts stores) so we can check and see if the the ground signal to the injectors is constant or intermittent?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Hi Juan!I have a noid light to plug test kit. I checked each injector plug and the light flashes at regular intervals that seem to be matching when the distributor would be sending the spark to that plug. I did this on all eight of the injector plugs and they all responded the same. Is that the appropriate behavior?
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

That is the proper behavior indeed.

I'm grasping at straws now, but how many miles are on that engine? could we have a stretched timing chain causing compression issues?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I am the original owner I have put all 190,000 miles. It has been well maintained but i have seen a puff of smoke occasionally when I start the car but it doesn't really burn oil. It has always has great acceleration but I have has some idle issues off and on for 6 months. When this happened I was almost out of gas, I do mostly city driving. I was on a city street going 35 mph and all of a sudden it seemed like it ran out of gas. It lost power but kept running for about 200 yards then it died. I was 25 yards from the station and has a gas can so I filled it up and put it in the car but I couldn't get it started
Customer reply replied 2 years ago
Lou instructed me to empty the gas tank when it seemed like their was water in the gas. i pulled the plugs and cleaned them off but i didnt check to see if the plugs were wet again after cranking it. Should I do this.
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

It can very well be more than just one thing causing the issue, that's why I don't see any harm in pulling the plugs again, specially when I'm about to ask you to perform a compression test. If compression varies 10-15 % or more from cylinder to cylinder, we'll know we have a stretched timing chain.

Best Regards.

Ask Your Own Mercedes Question
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

Oh, Oh... wife is giving me "the look". I got to put the laptop away and come to dinner. I'll try and check on you later tonight or tomorrow.

Best Regards.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
Ok, I know that look. Thanks and speak with you tomorrow.
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

I ate like a good boy so I was allowed to check one last time. Talk to you tomorrow...

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I did a compression test and all were at 120psi until I got to the last cylinder (#7) passenger side closest to the fire wall, it read as below 60psi. is that my issue?
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

I'm afraid so. Just to confirm, disconnect the fuel pressure regulator vacuum hose and connect a vacuum gauge. Have a helper crank the engine while you monitor the gauge; if you don't get at least 3.5-4 "Hg I'd say valve timing is off and it's time for a new timing chain set.

Best Regards.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
I don't have a vacuum gauge so I will need to rent or buy one to complete the test. I am fairly handy and have attention to detail but is replacing the timing chain something I should attempt to do?
Mercedes Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

Timing chain replacement on a M119 is not something I would recommend doing unless you are an experienced tech and have all the necesary tools.

Best Regards.

Ask Your Own Mercedes Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercedes mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Juan Crespo Your Own Question
Juan Crespo
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1,532
1,532 Satisfied Customers
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European

Juan Crespo is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,459 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

6,016 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
I have a 1992 Mercedes Benz SL500 which doesn't run. The
I have a 1992 Mercedes Benz SL500 which doesn't run. The symptoms are (1) it stops running while it's being driven, (2) it won't start up again until an hour or so after it's cooled down, (3) when try… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
I have an 03 sl500 and I removed the battery under the hood
I have an 03 sl500 and I removed the battery under the hood not the key won't turn the ignition what should I do. I know its an easy fix, I just don't remember. also is there a manual way to let the r… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I am trying to change the spark plugs on my 2012 ML350.
I am trying to change the spark plugs on my 2012 ML350. Videos on this all appear to be 2011 and earlier models. I am stuck on how to remove the unhinge cover to access the coils. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,487 satisfied customers
The abc warning light came on my sl500. I noticed a ticking
the abc warning light came on my sl500. I noticed a ticking sound in the front of the engine. Is it save to drive to the dealer about 30 miles away? … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
My 2003 SL500 volume control works on the steering wheel but
My 2003 SL500 volume control works on the steering wheel but not the knob on the head unit. … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,016 satisfied customers
Radio volume knob just keeps spinning on sl500 year 2000.
radio volume knob just keeps spinning on sl500 year 2000 … read more
Anthony P.
Anthony P.
high school
584 satisfied customers
I have a 1998 mercedes benz sl500 and its showing a error
Hello , I have a 1998 mercedes benz sl500 and its showing a error code 1900 and its a control module n15/7 faulty,basically what is that control module,thank you … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
My 1996 SL500 Hardtop will not unlatch. I've re-sync'd the
I've re-sync'd the windows. checked the hydrolick fluid level. and manually unlatched the rear latches. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2001 SL500 secondary air turns on trouble light. Replaced
2001 SL500 secondary air turns on trouble light. Replaced dead pump with bosch factory equivalent. Is there a relay somewhere that could cause failure? … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
1998 sl500. right hyd cylinder on roll bar leaking. how to
1998 sl500. right hyd cylinder on roll bar leaking. how to safely remove the cylinder? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Sl500 2001 sport. The ragtop has a magnetic switch in the
sl500 2001 sport. The ragtop has a magnetic switch in the header above the mirror thats broken … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
Lou this is with the 2001 sl500 r129 and the no air from
hi Lou this is frank with the 2001 sl500 r129 and the no air from center vents. Is there any electrical scamatic that I can get or buy best reguards frank***@******.***… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,016 satisfied customers
Will a front turn signal assembly off a sl500 fit a sl280
will a front turn signal assembly off a sl500 fit a sl280 year 96 … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
Sl500 top was stuck in slightly open position after not
sl500 top was stuck in slightly open position after not having any problems. Would not go up or down. Brought it to mercedes and they said everything needed to be replaced at a cost if $14,000. that's… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,016 satisfied customers
05 SL500 trunk lid will not latch. Initially it latches then
yes, key fob, emergency release, manual key, cabin release etc, per owners manual. … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,016 satisfied customers
Where is the heater fan relay located on 2003 SL500 located?
where is the heater fan relay located on 2003 SL500 located? … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
2003 MB SL500 Convertible Took it out of storage for the
2003 MB SL500 Convertible Took it out of storage for the winter started right up but says Electric Consumers Off Line and Top will not go down ??? … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,459 satisfied customers
My trunk on my SL500 is open and will not close. Also the
my trunk on my SL500 is open and will not close. Also the Convertiable top is down. … read more
Danny
Danny
Owner, lead mechanic
High School or GED
3,963 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x