8 valve idle problem
My 155 8v idles fine when cold.
When it gets to about 70ºC the idle gets lumpy like it's got funky cams on it.
Generally the car drives fine although I feel it should be quicker through the revs.
Checked for air leaks in the induction, everything has been off and resealed from the intake manifold forward.
The idle is also a little high (about 900 - 950 rpm).
AFM is good and so is the ICV.
I'm suspecting it might be the engine temp sensor telling the ECU that the engine is colder than it really is, so it's overfueling slightly when warm. I'm pretty sure the Lambda is OK as on constant throttle the car is smooth.
What are your thoughts ??