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
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.
Thanks I will check it now
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!
Thank you for your help
Looking for a Used C-Class in your area?
CarGurus has 31,744 nationwide C-Class listings starting at $1,900.
Search Mercedes-Benz C-Class Questions
Mercedes-Benz C-Class Experts