Question about 1998 Mercedes-Benz C-Class

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Lack of accelerating performance

Hi, my c200 automatic does not rapidly increase in speed when you put the accelerator pedal to the floor. The gearbox changes down and car revs at around 3500rpm but no further increase in revs or performance?

I suspect there is a problem with the accelerator cable sticking?

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This could be one of many problems or even a combination, most common are: clogged air filter, clogged catalytic converter, malfunctioning ECM, faulty mass airflow sensor, plugs/wires. take the vehicle in to have it diagnosed professionally. hope this helps.

Posted on Sep 30, 2009

Testimonial: "I will certainly take the car in for a diagnostic check up to see if they can identify the problem, it seems no straight answer to this problem."

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I had simaler prob with my car u cud pick up sped only by being easy on the throtle it turned out to b the air flow meater was easy to repair and cheap

Posted on Feb 01, 2010

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Maybe the exhaust is expierd by closed

Posted on Sep 21, 2016

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Not dumb, it's a good answer. The floor mat can slip forward (and has) in two of our new vehicles when we were driving on the highway. It had worked its way off the anchors and slipped forward, causing the vehicles to accelerate. I put the gearshift in Neutral, pulled off the highway and that was the problem, both times. I don't think it was on top of the gas pedal, underneath, but still pressing or I guess, pulling the pedal down.

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Next question is it automatic transmission or CV transmission
With automatic as you increase rpm the car will accelerate and you will feel ratio changes up to the point where road speed = engine rpm for that throttle setting
With a CV transmission ( constant velocity transmission ) there is a torque converter but that is where the automatic action ends
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Question to Toyota Ed: How would you explain Toyotas with Sudden unintended acceleration in cars that have the Denso pedal in them? I have heard that Volkswagen Jettas are also using the Electronic...

Hello, Zman777.

According to the material provided by Toyota, the Denso pedal does not have the alleged acceleration issue.

Also, according to information that has been provided by Toyota, the alleged acceleration issues is being caused by two possibilities;

One is additional placement(s) of floor mats on top of the factory floor mat. The extra mats are not secured, and can move around the driver side footwell, and, in the worst case scenario, move on top of the accelerator pedal, and trap in into the 'applied' position. I myself have experienced this mat/entrapment issue during a road test.

The other possibility is that certain accelerator pedal mechanisms may mechanically stick in a partially depressed position or slowly return to the idle position. Over time, the internal mechanism in the accelerator pedal my become worn. As a result of this wear, combined with certain operating and enviromental conditions, friction in the mechanism may increase and intermittantly result in the accelerator pedal being hard to depress and/or slow to return or, in the worst case, stick in a partially open position, increasing the risk of a crash.

In short, according to what we have been provided, the issue is mechanical, not electrical. The modification that Toyota dealerships are performing rectify this issue, and, this modification has been approved by the NHTSA.

Nowhere has it been found that the vehicles with the alleged acceleration issue have 'accelerated' without warning, as in sitting still, and the car is suddenly going 100 mph. None.

What 'could' happen, if the pedal 'was' sticking, is, in my opinion, an 'Unexpected Non-Deceleration' condition.

If you were going 15 mph, and the alleged issue appeared, when you let off of the gas pedal, the car would continue at 15 mph, and NOT accelerate to 100 mph, as has been falsely mentioned in the media.

Regarding VW, sorry, I cannot comment on VW, or any of their systems, I am not a certified VW mechanic.

I hope that this info helps you out.

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