Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Story here but I will do my best to explain. Working on a…

Customer Question
Hi, long story here but...
Hi, long story here but I will do my best to explain.
Working on a 2009 C63 with 167k miles.
The vehicle was sent to me by another shop. A used engine was installed but I do not know anymore background info.
The vehicle has headers with NO front or rear catalyst.
The engine runs but poorly. On acceleration the power cuts in and out very badly one second and accelerates normally the next. It feels as if the throttle is snapping shut and opening rapidly.
Also the idle is poor
Submitted: 3 months ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Customer reply replied 3 months ago
Also the idle is poor.So far I have replaced the intake manifold assembly, flashed the ME to a stock tune, replaced the front o2 sensors, replaced the air filters, smoke tested the intake system multiple times for leaks, and replaced the cam adjusters and bolts. I did not replace the diamond coated washers between the cams and adjusters (although I should have). I did set the timing with the proper tools and I did inspect the cams and lifters for wear.I have also reset and performed all adaptions multiple times with xentry (cam timing adaptions, throttle adaptions, sensor rotor adaption, etc).All parts used were genuine MBZ.I do get faults for the air mass not correlating with the throttle angle and I get intake cam adjustment faults on both banks.When driving the engine pulls one moment and the next cuts in and out badly as if the throttle is snapping shut and re-opening. At idle it is okay one second and then either rough or too high (1000 rpms) and will stall randomly.I replaced the front oxygen sensors because the looked fouled out, as do the rears currently. I assume because the car has no catalysts.
Customer reply replied 3 months ago
Also I have inspected the flex plate sensor rotor for damage and found none.
Answered in 3 hours by:
3/11/2018
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,014
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
Verified
Hello my name is***** am going over your request now and will reply back soon with some info OR a few questions that would help me better determine how to help you. Keep in mind I have no idea of your technical ability or what you do and do not already know. So the more info you can tell me the better. I have been on the site for almost ten years and have oustanding 5 star ratings so trust that I will do everything I can to get you taken care of, Lou
Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago
Can you give me the fault code numbers and or screen shots showing the fault codes?
Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I can but not until tomorrow
Customer reply replied 3 months ago
Also my technical ability is high and tool availabity is very high.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago
OK sounds good I will be online all week and I figured your technical ability was high that is just my standard opening sentence LOL I get a lot of I already know that and you didn’t tell me anything I didn’t know LOL
Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I will provide the fault codes numbers tomorrow of course. I did look them up in WIS and followed Xentry test plans which were not helpful. They basically said Check for false air, which I have done several times. The M156 has no actual values for air mass sensors.Although the running problem is so drastic it feels way beyond a small vacuum leak, etc. 1/2 the time it dies immediately upon start up.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok sounds good.,

do you have a smoke machine?

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I smoked the intake several times and found no leaks.I also removed the air pump hose and tried to blow through the air pump check valves to make sure they were not stuck open.Fault codes:
See attached photoP3729 The measured left air mass is implausible compared to the position of the throttle valves (P010B)P1351 The measured right air mass is implausible compared to the position of the throttle valves (P0101)P0271 Continuous camshaft adjustment (right): incorrect position of intake cam (P0011)P0275 Continous camshaft adjustment (left): incorrect position of the intake cam
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

did someone install aftermarket air filters in this engine?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok you said something strange that i thought i read, this engine DOES have mass air flow sensors.

there are in the intake pipe. the one on top of the engine.

can you send me a few pictures of the top of the engine.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

oh NO actual values, sorry , misread

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
the engine does have air flow sensors. They are however a strange type and Xentry, Autologic, or any other scan tool does not have an actual value reading that you can view for them.Correct no actual values
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok, there is a way to see them, i forget at the moment but i can try through my sds later tonight, you have to go to tests or fault codes and perform the test and it will show you the values.

i used to have issues where people installed K&N air filters and there was TOO much airflow, can you verify the air filters?

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
Do you know if the rear oxygen sensors are used for mixture calculation by ME9.7 or if they are only to monitoring the front sensors and converters?I can’t seem to find that info
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

primarily to monitor cats.

the front ones adjust as well as the mass and map

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I went through every possible menu of the SDS and found no possible way to view the air mass readings. I even followed the test plans for them and it just gives pin out information which I followed.The air filters have been replaced by me and are original
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok,

gotcha.

and you dont know what happened before this engine right?

can you see the engine number on the side of the block? should be near the motor mount bracket on one side. ill have to see where.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

sorry see you got new air filters as well.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok, i see you replaced the cam adjusters, but did you replace the solenoids?

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I was told the old engine had a knock.... but I am unsure since I did not see the car previously and I trust no one but myself.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

thats for sure lol

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok, so when you said you followed the test plans for the mass air flow, did you process the fault codes by pressing f3 on the fault code?

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

if you have access to the internet with your scan tool maybe download teamviewer and I can jump on your scanner and walk through it with you.

i am wondering if the engine is correct for the car.

you cant just slap any old M156 amg engine in any car.

at least im pretty sure.

sorry I dont have a quick fix for you.

this will take some diag, i am willing to help,

let me know your thought.s

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

teamviewer is free for use.

Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

hey make sure the mass air flow sensors are facing the correct way just to be sure, the air has to flow through them the correct way.

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
The air mass sensors are positioned properly.I do have a SDS with teamviewer installed already. But it may be hard to do in the middle of my shop day.Yes I processed the faults with SDS test plans.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

ok,

do you stay late? ever?

i am on all day every day basically

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I stay late often but I am on the west coast. I can log you on between 5pm and 6:15pm Pacific
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

k that might work.

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
Or I can come early tomorrow morning 7am Pacific
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

i will be traveling at that time.

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
I can set up SDS around 4:30 Pacific today if that works for you.Team viewer 7 or 13?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago
That might work, that would be 6:30 my time , ill send over the offer
Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago
It might make you updste to the newest one anyways
Ask Your Own Mercedes Question
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 3 months ago

and no worries if we cant figure something out i have no problem releasing the questions to others,

Ask Your Own Mercedes Question
Customer reply replied 3 months ago
Did you already refer me to someone else?
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 MB Paul Your Own Question
MB Paul
MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3,567
3,567 Satisfied Customers
Experience: Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

MB Paul 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

29,009 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

6,014 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

3,131 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

602 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 want to chat with. MB changed my front rotors and pads on
Hello I want to chat with . MB Paul changed my front rotors and pads on my 2010 E350 4mqtic, now brake pedal seems to have a lot more travel than it did before, seems to stop the car just fine ,but su… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
705 satisfied customers
Mercedez ml500, 2005 I need to replace brake pads and rotors
Mercedez ml500, 2005I need to replace brake pads and rotors Front and back I never done this to this car, is there something different/ special that i need to account for?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I need to replace my brake rotors & brake pads. My car. 208
I need to replace my brake rotors & brake pads. My car. 208 Mercedes C230. Please quote a price, including labour & all taxes. With thanks, ***** ***** Bartel. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
2014 MBML BTC. changed rear rotors and pads- but getting
2014 MBML BTC. changed rear rotors and pads- but getting message"conditions not correct" the red park is flashing and the orange P is lit … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,014 satisfied customers
Changed brake pads and rotors on 06 cls500, now the reduced
Changed brake pads and rotors on 06 cls500, now the reduced brake light and all kinds of bells and whistles. Also brakes are hard.… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,014 satisfied customers
Cannot get the rotor to release on the distributor. seems to
cannot get the rotor to release on the distributor. seems to be baked on as it is very fragile and flaking apart as I try to get it to loosen up so I can change it. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
I'm attempting to change the rear rotor on my 2017 GLE 350
I'm attempting to change the rear rotor on my 2017 GLE 350 my concerns are the electric parking brake … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,014 satisfied customers
Yo just replaced distributor, wires, rotor and my gas milage
yo just replaced distributor, wires, rotor and my gas milage went south! was going to start if I gapped the plugs right It's a 1989 mercedes benz 300sel. I use to get 400 miles on a tank of gas really… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Have a code P22a1 oxygen sensor bank1 sensor2. Vehicle runs
Have a code P22a1 oxygen sensor bank1 sensor2. Vehicle runs fine when cold but after it heats up has a hesitation with an squeal ( like its sucking air) around 1800-1900rpm. Any ideas? … read more
Wolfgang
Wolfgang
8 satisfied customers
How much can I expect to pay to get brake pads and rotors
How much can I expect to pay to get brake pads and rotors replaced in my 2015 mercedes ml350… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Just wonder if w210 has oxygen sensor fuse ?? Becouse i have
Just wonder if w210 has oxygen sensor fuse ?? Becouse i have faulty oxygen sesnors (Upstream) both.. I am curious what can cause them go bad.. iv just cleaned MAF with electrical connector.. but I sti… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2003 CL500 did a front brake job.. rotors & pads.. when I
2003 CL500 did a front brake job.. rotors & pads.. when I took for a test drive the power steering was coming in & out… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I had bra new ceramic pads and new rotors installed
I had bra new ceramic pads and new rotors installed yesterday, went to pick car up today and the pedal went all the way to the floor. They are not grabbing properly. So I had to leave it there and tak… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
6,014 satisfied customers
Have done a complete brake job, rotors, pads, rebuilt 3
have done a complete brake job, rotors, pads, rebuilt 3 calipers - replaced 1 calipers, master cylinder. Did pressure bleed. Pretty sure I've got all the air out of the system. I don't like the way th… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Will not start ,cranks over. 1986. Cap, rotor, coil
will not start ,cranks over JA: Have you checked the engine's fuel supply? And the spark plugs -- are they all working? Customer: yes JA: What is the model/year of your Mercedes? Customer: 1986 JA: Ar… read more
rpmdiag
rpmdiag
High school
7,668 satisfied customers
Lou, I replaced the rotors, distributor caps and forward cam
Lou, I replaced the rotors, distributor caps and forward cam sensor in my 1990 500sl. I put 2 containers of Techron in a full tank of gas and let it sit for a week. It started right up (rough idle) an… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Why dc I need to replace pads and rotors on a 15000 mile
Why dc I need to replace pads and rotors on a 15000 mile 2013 S 63 that I absolutely do not drive hard. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
I have a 2007 ML350, just replaced the brake pads & rotors.
I have a 2007 ML350, just replaced the brake pads & rotors. Upon leaving it seemed that on slight acceleration the tires were slipping (but with the sound of ABS vibration). We replaced the speed sens… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 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