Rough idle

Asked by Nov 05, 2017 at 07:54 AM about the 2004 Mercedes-Benz C-Class

Question type: Maintenance & Repair

Hi there, when i had the car in park gear the revs
would jump up and down and the car would make
a funny noise. This happened when the engine was
hot! Any advice would be much appreciated. Thank
you.

2 Answers

269,735

Is the check engine light on? If so scan for the codes. Could be many things. The key is to isolate the funny noise first.

Hi tom, there is no engine light on. The" noise" is related with the air intake. Is like someones accelerating the car. Could this be because of a bad spark plug?

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