Cold start ok, hot start no, high idle,

[Pwrtrip75]

I got this 95 TSi and have never touched a DSM before and dont really know anything about them. I bought the car with a bad water pump and the head gasket poured oil out the front. It ran though... idled high, but ran.

I replaced the head gasket, went through the head, replaced the water pump and timing belt and all components.

Car starts up fine cold, idles to about 1500-2000, I took it for a short drive Idle at stop sign was now normal. It had a little sputter in the upper rpms (plugs maybe, i left the old ones in for now), Check engine light came on, drove back just fine. I shut it off in my driveway and it wouldnt restart. It would fire, sputter at 400rpms for a couple seconds then die. Would not stay running. Left it and went in for the night,.

This morning I wanted to see what it would do. It fired right up, ran smooth, and idled a little high.

Im at work now and havnt looked at this.. But it seems temperature related, and what previously happened by the old owner, water pump shaft snapped, over heated, stretched the head bolts/compressed gasket, cooled and thats how the gasket leaked, the head bolts I loosened with one hand.

Would the temp sensor possibly be damaged in overheating? ive never had it happen to me (never overheated anything like that)... has anyone else?

I dont know the codes, I have HP Tuners for my LSx cars and supposedly the scanner on it can do any OBDII cars... ? I will check tonight.

Thanks.

 

[robtheturbopric]

sounds like the idle air control motor might be bad. or at least going bad. this is located on the throttle body and makes an odd vibrating noise when working.

 

[Pom]

as rod say it might be the iac, i had the same kind of problem but mine was idling too high whe hot