C220 Cdi rough idle when warmed up

[Bjorn]

Hello,

Pls. help!... Anyone heard or know of this problem. At startup cold the engine run rough, only at low idle.

C220 Cdi year 1999

Rgd Bjorn

[engatwork]

Not real sure about your model - it is not sold over here BUT it sounds like a glow plug issue to me.

[Bjorn]

Thanks... is there any way to test the glowplugs? or just replace them

[blackmercedes]

Our 1998 E300 had the same problem. The glow plugs were bad. The car would run like crap whenever the car was cold started. It got to the point where it would barely start when cold, and even "warm" starts were effected. I don't know a test, as we had them replaced by the dealer. This seems a common problem with newer MB diesels. No idea why.