In idle time the engine is working well without AC but when it is on and I increase gas returning to idle time the engine is off can some one help me please

Asked by Apr 19, 2014 at 12:57 PM about the 2001 Mercedes-Benz C-Class 4 Dr C320 Sedan

Question type: Maintenance & Repair

4 Answers

101,385

Are you saying it won't idle with ac on? If so then it's probably a dirty/faulty idle air control valve or dirty throttle plate giving you problems.

1 out of 1 people think this is helpful.

Thanks I will check it now

120

For rough idle problem check the fuel pressure regulator (on injection system @ front top of motor) it has a small rubber vacuum line on it, with the engine running; gently pull off the vacuum hose and hold it about 1/4 inch away from nipple. If you see petrol coming from the nipple on the regulator into the vacuum hose - there's your problem! Replace the fuel pressure regulator and it will run like new!

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