hey guys,
I have been having trouble with a hanging idle only on startup when HOT.The car when u start it will hange about 1500 for about 2 sec then drop down to 1300 hand for about 4 sec the goes back to normal. I have tryed cleaning the IAC vale and replaceing it to. I was wounding if it is something my computer reprogramer, PCMforless could fix ? if not what else could i try?
Thanxs grant



THe engine
355 11 to 1
cc305 cam,some porting on stock head

 

Isn't that normal on startup? I thought the computer does that to build some oil pressure.

 

The PCM sets the idle based on coolant temp. Make sure your coolant temp sensor is reading correctly. If its reporting a temp colder than actual on HOT startup, it could affect the idle speed.

 

coolant temp sender is ok already check that.