How JustAnswer Works:

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

Ask Billy Your Own Question

Billy
Billy, Trainer/Master tech.
Category: Mercedes
Satisfied Customers: 3279
Experience:  Trainer 8+ years, Master tech. 10+ years, SAE member
30385560
Type Your Mercedes Question Here...
Billy is online now
A new question is answered every 9 seconds

Mercedes-Benz C280 98 c280; goes into limp-home mode during

Resolved Question:

'98 c280; goes into 'limp-home' mode during normal driving. (I assume it's limp-home, because full throttle will only achieve very light acceleration and has excessive peddle play) After reseting the throttle it works normaly, for a while, but eventually the throttle becomes almost inoperative.
simptums are:
Extremely timid acceleration
No passing gear
No 'Check-Engine" light
Will (eventually) reach full RPM and shifts normally or manualy
Any ideas? I'm desperate! I really hate this "feature". Someday it'll get me killed when I step on the gas and nothing happens.
Submitted: 3 years ago.
Category: Mercedes
Expert:  Billy replied 3 years ago.

Billy :

Hello and thank you for using Just answer! I'm Billy and i will assist you with this. Feel free to ask if further info is needed.

Billy :

I would appreciate some further info on the matter:

Billy :

- please confirm that check engine light or no other warning lights are on..........and that check engine light does turn on with ignition and then off

Billy :

- how are you resetting the throttle?

Billy :

- did you check anything yet?

Customer:

No 'Check-Engine' light.

Billy :

- how are you resetting the throttle?

Billy :

Given the info i already have, i can tell you the following:

Billy :

- if check engine light is operational (turning on for a second, with ignition on, and then off all the time), then you are not experiencing the limp home mode......

Billy :

You have a lack of power, which could be caused by a number of factors, but in my opinion, it is a faulty throttle actuator motor.

Customer:

check engine light comes when ignition is turn to 'On', goes off on start-up.

Billy :

You should have the throttle actuator inspected, and if possible, connect the vehicle to a scan tool, and read the live data while driving the vehicle, and this should show the faulty component.

Customer:

resetting throttle: turn ignition to 'on' wait 5 secs, press peddel to floor, turn ign off, wait 5 min, restart

Billy :

ok

Billy :

Again, you are not experiencing limp home mode.............but you are having reduced performance, due to a faulty component......

Billy :

I would first suspect the throttle actuator motor, as it is a common issue on your model, and it would cause the same symptoms..........however, i think you should have a scan hooked, read the live data, to figure out what sensors are reading etc...to get to the faulty item.....

Customer:

That makes sense, I'll follow up on having it scanned and focusing on the throttle actuator.

Billy, Trainer/Master tech.
Category: Mercedes
Satisfied Customers: 3279
Experience: Trainer 8+ years, Master tech. 10+ years, SAE member
Billy and 5 other Mercedes Specialists are ready to help you

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 P Elm City, NC
< Last | Next >
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, 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. Jim Castleberry, 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
 
 
 

Meet The Experts:

 
 
 
  • MB Paul

    Mercedes Technician

    Satisfied Customers:

    3450
    Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
< Last | Next >
  • http://ww2.justanswer.com/uploads/MB/MBpaul/2013-8-21_204936_paul.64x64.jpg MB Paul's Avatar

    MB Paul

    Mercedes Technician

    Satisfied Customers:

    3450
    Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    Mercedes Technician

    Satisfied Customers:

    22931
    Bosch Certified Master Tech. Over 35 years experience.
  • http://ww2.justanswer.com/uploads/RA/Racer76916/2012-5-8_6855_justanswerprofile.64x64.jpg Michael Warfield's Avatar

    Michael Warfield

    Factory Mercedes-Benz Technician

    Satisfied Customers:

    2807
    Mercedes-Benz Master Certified technician
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Mercedes Mechanic

    Satisfied Customers:

    2556
    Over 15 years experience as a Mercedes dealer technician
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    Mercedes Technician

    Satisfied Customers:

    642
    MB Tech. since 1997. ASE Master. MB Factory Technician. MB Antique Specialist.
  • http://ww2.justanswer.com/uploads/promerc/2009-01-04_220431_ja_pic.jpg promerc's Avatar

    promerc

    mercedes diagnostic technician

    Satisfied Customers:

    487
    Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech
  • http://ww2.justanswer.com/uploads/73bbchevy/2009-12-8_232724_Picture_006.jpg Lou P. master tech's Avatar

    Lou P. master tech

    Mercedes Technician

    Satisfied Customers:

    418
    10 years master certified 100% fix rate knows mercedes like the back of my hand!!!!!
 
 
 
Chat Now With A Mercedes Mechanic
Billy
Billy
Trainer / Master technician
387 Satisfied Customers
Trainer 8+ years, Master tech. 10+ years, SAE member