I replaced blown head gaskets and surfaced the heads after car overheated. The car now runs great, but it idles to fast. I can not get it smog checked with fast idle. I switch out the TB with a good used one that I had. I cleaned both the TB and its IAC. There was no change in idle speed. I checked for vacuum leaks and could not find any. I checked the MAF sensor and it looked clean. I replace the PCV valve and checked the condition on the air tube between the MAF and TB (looks good). What the car does is idle at normal 750 rpm when cold at first start up, but when the car warms up, the idle goes as high as 1,300 (between 900 and 1,300 for it changes slowly). There is no engine code for the IAC and not even if I unplug the IAC. When the IAC is unplugged, the engine speed stays the same and no check engine light. Please, can you help me?
have the same problem?
Thursday, August 22nd, 2013 AT 12:00 PM