My 1996 Mercedes C280 will occassionally lose acceleration, pick back up, and lose it again

10

Asked by Aug 18, 2012 at 01:31 PM about the 1996 Mercedes-Benz C-Class C 280

Question type: Maintenance & Repair

Unfortunately, my mechanic cannot reproduce the problem.   I will be driving at normal speed.   I stop for a stop sign or light, and when I accelerate it tops out at maybe 20 mph and then slows down to 5-10 mph, speeds ups to 20 mph, etc.  The accelerator is held at a constant depression.  If I put the car in Neutral, the engine cycles through the same loss and pickup of power.  If I stop the car, and let it sit for a few minutes, it typically does not reoccur on that trip.   It is not easily repeatable, but the 3-times it has happend to me seem to have the same pattern:   I drive the car for about 30', I park for about 15' (i.e., the engine is still warm), I start driving again and it occurs.  I have had several refills between incidents so I don't think it is bad fuel. My mechanic's only guess is the fuel pump, but they are hesitant to replace it without knowing for sure due to the expense.  I am trying to get the problem to occur again so that I can drive it (slowly!) to the mechanic to experience it first hand. Thanks for any ideas.

7 Answers

10

A bit more info. My mechanic actually identified several other possible culprits including the Mass Airflow sensor, but without knowing did not want to just start replacing parts willi-nillie. They had the car for this last week, tried to reproduce the problem, to no avail.

1 of 1 people found this helpful.
20,405

I would check the ECT (Engine coolant temperature) sensor. Also check of vacuum leaks. For some reason when my car had a vacuum leak it ran worse at times like you describe. When it was restarted at a temperature in between cold and operating temperature.

2 of 2 people found this helpful.
10

Thank you Andrew. I know my mechanic checked for vacuum leaks but he didn't mention the ECT as a possible culprit - I will mention this to him!

5,325

I would first get the codes read off the ecu, it should be throwing a code, and that would lead you in the right direction into solving the problem. It sound to me like you have a failing throttle actuator. These cars have a drive by wire set up. The accelerator pedal is not connected directly to the throttle body, but instead to a module that sends a signal to the computer which in turn controls the opening and closing of the throttle through an electric motor. It's all electrical and prone to failure.

7 of 7 people found this helpful.
20,405

I was unaware the car was throttle by wire. If so that is a definate possibility. Thanks Lorne

10

Hi Lorne, thank you. That is useful information that I was not aware of!

10

my 96 Mercedes i just bought is having this SAME problem, but this happens to me Once or Twice per week. i noticed either the ASR or ASD light comes on as soon as i stop at a light or stop sign, then i cant accelerate at all ,if so hardly. I Read that the ASR and ASD are Anti Skid protection by the cars CPU. I ALSO read that you can Remove or Disable it. and being i dont live in the heavy rain or snow it shouldnt matter... Does anyone know how i go about disabling the ASR/ASD?????

1 of 1 people found this helpful.

Your Answer

C-Class

Looking for a Used C-Class in your area?

CarGurus has 26,005 nationwide C-Class listings starting at $1,500.

ZIP:

Mercedes-Benz C-Class Experts

  • #1
    Lorne Grandison
    Reputation
    5,240
  • #2
    PPC123
    Reputation
    3,770
  • #3
    zabi
    Reputation
    2,770
View All

Related Models For Sale

Used Mercedes-Benz E-Class
605 Great Deals out of 22,149 listings starting at $1,999
Used BMW 3 Series
1,128 Great Deals out of 33,127 listings starting at $1,428
Used Mercedes-Benz S-Class
115 Great Deals out of 7,634 listings starting at $1,200
Used BMW 5 Series
456 Great Deals out of 16,104 listings starting at $1,032
Used Audi A4
255 Great Deals out of 11,991 listings starting at $1,899
Used BMW M3
41 Great Deals out of 1,942 listings starting at $5,999
Used Honda Accord
925 Great Deals out of 78,229 listings starting at $1,295
Used Ford Mustang
445 Great Deals out of 42,042 listings starting at $1,488
Used Chevrolet Camaro
526 Great Deals out of 31,057 listings starting at $1,450

Used Cars For Sale

2017 Mercedes-Benz C-Class For Sale
214 Great Deals out of 4,075 listings starting at $24,998
2016 Mercedes-Benz C-Class For Sale
31 Great Deals out of 985 listings starting at $20,999
2015 Mercedes-Benz C-Class For Sale
234 Great Deals out of 3,783 listings starting at $17,990
2014 Mercedes-Benz C-Class For Sale
82 Great Deals out of 1,538 listings starting at $12,595
2013 Mercedes-Benz C-Class For Sale
65 Great Deals out of 1,334 listings starting at $9,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.