Mercedes

Have Mercedes Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Mercedes

No power!! It started out fluctuating but is now consistant.

Customer Question
It started out fluctuating...

It started out fluctuating but is now consistant

Mechanic's Assistant: What is the model/year of your Mercedes?

2007 freightliner business class m2? Mercedes 926

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Yes! fuel filter...twice this week and new air filter

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Also we just replaced the air compressor, governor, new air lines bc it wasn't building air pressure....that is all working properly now just now power

Submitted: 1 month ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Customer reply replied 1 month ago
We have no power. Only code that its throwing is a high voltage code. We are down to only this truck and need help fast!!!
2007 freightliner m2 Mercedes 926 auto Allison push button tranny
Answered in 12 minutes by:
12/31/2017
Mercedes Mechanic: Matt, Engineer replied 1 month ago
Matt
Matt, Engineer
Category: Mercedes
Satisfied Customers: 22,614
Experience: Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing
Verified

Hello and welcome to Just Answer

I'd also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

If both of these are OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

If the above are all OK then try checking for airleaks after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for causing rough running. As its a mechanical fault it tends not to turn on the fault light and you can sometime hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas around each joint in turn. If the engine rev's up you've found your leak.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.
if the engine condition is the same then chances are the meter or the connection to it is faulty

its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no acc**t touch the sensor wires with anything physical as they are extremely fragile

I'd also suggest inspecting the throttle pedal sensor for corroded contacts and damaged wiring

and finally its worth doing a compression test on all cylinders just to ensure the that the base engine is OK

Ask Your Own Mercedes Question
Mercedes Mechanic: Matt, Engineer replied 1 month ago

My goal is to give you the best advice that I can and I hope that I've helped today. Please remember to rate my service by selecting from the 5 stars at the top of the screen before you leave. If you need more help, use the reply box to let me know.
If you're not pleased, also let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent further replies
Thanks Matt

Ask Your Own Mercedes Question
Mercedes Mechanic: Matt, Engineer replied 1 month ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! If you're not pleased, also let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent further replies
Thanks Matt

Ask Your Own Mercedes Question
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer
Category: Mercedes
Satisfied Customers: 22,614
22,614 Satisfied Customers
Experience: Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

Matt 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

3,771 satisfied customers

15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,131 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

22,614 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
The lift-gate is not working automatically.The latch of my
The lift-gate is not working automatically.The latch of my 450gl releases anytime I operate with the remote but the door remains down until I will manually lift it up. … read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
I am having a problem with my brake line. When I install the
I am having a problem with my brake line. When I install the brand new caliper on the rear right-side of my 2001 E320 Wagon Non-4Matic, the caliper threads on fine, but stops facing the wrong directio… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I have a W211 E350 2006 lately ive been having some minor
Hi i have a W211 E350 2006 lately ive been having some minor troubles , it began like 2 months ago with Alternator Serial Interface and Voltage to high And 02 sensor , i replaced the Voltage Regulator… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
350 mercades trim comg off inside. Mercades 350 trim coming
350 mercades wood trim comg off inside JA: What is the model/year of your Mercedes? Customer: mercades 350 trim coming off JA: What year is your Mercedes? Customer: 2014 JA: Are you fixing your vehicl… read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
I am working on a 2008 Mercedes GL450 replaced engine car
I am working on a 2008 Mercedes GL450 replaced engine car start for fusick in and dice I have a code 2289 you can help me … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,631 satisfied customers
Camshaft issue. S63 2010 WDDNG7HB3AA315103. I need to know
camshaft issue JA: What is the model/year of your Mercedes? Customer: s63 2010 WDDNG7HB3AA315103 JA: Are you fixing your vehicle yourself? What have you tried so far? Customer: I need to know if there… read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
I was removing the intake manifold in my 2009 Mercedes-Benz
Hi, I was removing the intake manifold in my 2009 Mercedes-Benz E350 so I had to unplug the wiring harness while I was reconnecting everything I have one plug that I can't find where it goes , can you… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
My mercedes e350 ESP and ABS light came on and its hard to
My mercedes e350 ESP and ABS light came on and its hard to steer at low RPM's … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Where will I find the fog light fuse for 2010 Mercedes c300.
Where will I find the fog light fuse for 2010 Mercedes c300 … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
I pushed a few buttons in the message area didnt have my
I pushed a few buttons in the message area didnt have my glasses. SRS came then drive to workshop without shifting gears i selected pushed again only to realize this is what the writing was … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
2006 SL500, trunk won't open with either the key fob or the
2006 SL500, trunk won't open with either the key fob or the switch in the drivers door but will open with the mechanical key. Top will not go down, it says the divider is not closed but it is. There i… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I put the break on too hard and when I went to take it off,
I put the break on too hard and when I went to take it off, it would not budge-- Mercedes benz cls 500 … read more
Bart Zorchets
Bart Zorchets
1 satisfied customers
I have a 2004 Mercedes Benz c230 kompressor and I have a
I have a 2004 Mercedes Benz c230 kompressor and I have a coolant leak in front of the valve cover, what should I look for leaks.… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,631 satisfied customers
Red battery icon visit workshop. It appears to be 12.6V.
nothing. just troubleshooting what could be possible solutions. I recently had to jump the car off due to it sitting for about 2 months in very cold weather … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,631 satisfied customers
I have a 2011 c300 sport. I'm getting a “check left low
I have a 2011 c300 sport. I'm getting a “check left low beam” message. I replaced the bulb and it comes on briefly when it's turned on, but shuts of after about a second. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
I am considering purchasing either a 2014 MBZ C250 sedan or
I am considering purchasing either a 2014 MBZ C250 sedan or a 2015 C300 4MATIC sedan. Both are CPO vehicles. Is one of these vehicles more reliable than the other? Which would you recommend for long t… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
2008 Smart car, sat in a garage for 2 years, frozen battery,
2008 Smart car, sat in a garage for 2 years, frozen battery, replaced, turn key, nothing but a click in the rear compartment followed by 13 beeps(like seat belt beep but always 13 after first try on i… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
My car has been parked and as soon as I started it. It said
My car has been parked and as soon as I started it … 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