just put in a lightly used (90,000mile) stock LS into my 99 integra, swapped EVERYTHING over from the old motor to the newer one, only thing i didnt swap over was the idle control valve, a week later and the car was starting to have idle problems, (would idle at about 250-300 instead of 750) once it warmed up it would idle at the tuned 750. i then swapped the idle control valve from the old motor over, which was clogged with debris, cleaned that up and installed it, seemed to work fine. about a few days later. i went to start my car in the morning after not being driven for a night, the car wouldnt start. it would turn over, but would cut off. same thing the old ICV did. now if i put my foot on the gas and hold it at about 2500 for about 2 minutes and slowly drop the rpms down it will hold idle and i can drive off. any ideas on what this is?

 

You from Charlottesville? Just checkin'.

 

yep sure am.

 

Have you checked the coolant temp sensor?

 

which coolant temp sensor?

 

The coolant temp sensor that the ECU uses to sense the coolant temp.

The other coolant temp sensor (the sending unit for the engine temp idiot gauge) is not capable of affecting how the engine runs, therefore that wouldn't make any sense to check.

 

thats what i thought, had a blonde moment lol.. ill check that too