As soon as the engine gets a little warm my idle goes up and down. I put on a brand new MAP Senor that didnt help. If I remove the connector to the MAP Sensor while its running the idle is fine(runs normal). If I put it back on the engine will still run fine, however when I restart the car the problem returns. Does any one have any suggestions? Thank You. P

96 civic 5pd dx

 

The main reasons for that are that the IACV is dirty, or the cooling system is not completely full. Check in the radiator with the engine cold-- must be full to the top. (The reason why that matters is if it is not full, the ECT sensor will output varying readings as the coolant splashes around in the head. The ECU is programmed to vary the idle speed based on temperature read from the ECT.)

 

Thank you very much for the quick reply. I will check these symptons. P

 

Dude Thank you so much! That worked! I took off the whole throtlle body took very peice off cleaned it put it back on problem solved. The coolant was filled to the top. I even had a problem where I needed top give it alot of gas to get it into first gear that problem is also solved I guess its all connected,