W202 C180 backfiring at cold idling

[hopeclarkie]

I would appreciate any help here. C180 1997 62k miles. The car starts ok from cold and then within a few seconds or so the revs climb to about 1200rpm. The engine then hunts and pops like small backfires until it warms a liitle a few minute later and returns to 700rpm. The car then drives smoothly and is ok. During the hunting there is smell of fuel from the exhaust.

I have cleaned the throttle body and the air filter is new. The air sensor is clean and looks ok.

Any ideas would be most welcome. Thanks

 

[hopeclarkie]

Well it did not get any replies so perhaps its an unusual event? Anyway if anyone does want to know its now solved. It was a sticking valve at start up and resolved with cleaning fluid sprayed in to the air intake. My garage sorted it in minutes. Happy days.

 

[bennesspipers]

What cleaning fluid did they use ?

 

[C230kompressor]

hummmm a sticky inlet valve?