I boughta 2001 C320 for my wife about a week ago. I noticed a slight hesitation about two days after we got it. Now the car is just running horrible. If I excelerate any thing over 1/4 throttle the power is very flat and does not shift properly. The service engine light has not diplayed and when we ran diagnostics the only thing we got was a few tranny codes that the tech said would play no part in the behavior of the car and erased them. Does any one have any idea what this could be. This is my firstMercedes and I want to love it but I am having a hard time.

Thanks
Matt

 

the ignition coil pack wires tend to go bad and depending on how bad and how many cyl are affected it may or may not set a code. you may need to take it to a dealer since they have the equipment to properly diagnose it.

 

Our '04 C320 ran poorly and shifted roughly at about 30-35K miles. The shifting problem became worse over time & eventually the entire transmission was replaced under warranty. The Mercedes service tech said that it was probably defective since new. We heard a roaring type sound since it was new, but assumed that this noise was caused by the very low profile tires/wheel package. The car ran much quiter and shifted normally after the trans was replaced.

 

I figured it out!!! Most of the time after you repair a problem that the computor adapts to the car will reset the adopted runnig sequence and return to normal. SOMETIMES it doesn't and you must reset it manualy by disconnecting the battery cables and touching them together for ten seconds discharging all the computers in the car restoring them to factory settings.