idling kinda high

[ManYaiK]

Yo,

 

My 87 spfi is idling between 1500 and 2000 on cold start and between 1000 and 1500 on warm start in park and neutral. Is this normal for spfi with 3spd slushbox?

 

 

Thanks

 

Dave

[ManYaiK]

Major whoops.....could a mod please move this thread to the older gen soobs section?

 

 

Thanks!!!

[MorganM]

The EA82 SPFI has its own 'choke' system so yes it will idle high when its cold. This is to warm up the engine so it can go into open loop and run more efficiently. It should hold the idle pretty steady however, not bounce between 1500-2000. As the engine warms up the idle will slowling come down to 800 and again should be pretty solid. No osilation or misfireing at idle.

[mr.radon]

I had posted about my idle problems. this weekend I solved it. I took the advice I had gotten and took off the IAC valve (I think this is what it is called). It is bolted to the SPFI throttle body. Easy to find, there is an airbypass pipe going to it.

The ECU senses the throttle is at idle and uses this valve to regulate air past the throttle body to the engine. There is a screw on the side of the housing where you can make a few fine adjustments. First off ignor the screw, remove the electrical connector and bypass hose, then the four machine screws (phillips) to get the valve in your hands. Clean it out with carb or brake cleaner. Mine was sticky and when cycled wouldn't come back quickly causing my engine RPM's to zoom sometimes.

Clean the valve up nice and neat then reassemble the unit. Get someone in the car to start it up when warm. If not warm drive it around the block a few times. While idleing tell them to watch the tach or hook up a technicians tach yourself. Next to the IAC valve is a screw (flat) clockwise will lower your idle slightly. I'm humming at 750 +- 50 after it is warm. No more wild swings in idle. Took about ten mintues.