A while ago I was having problems with my 92 idling extremely low (250ish). A few days after this began, the engine would simply cut off if out of gear. To remedy this, I turned the idle screw on top of the engine. This seemed to get the idle up to the 500-600 range and I was satisfied. However, since then (about two weeks), it has dropped down to 400 at times and I am afraid that it will keep slipping. Any suggestions? Should I just keep opening up that idle screw or is there something else timing related that's going on here?

Any thoughts would be appreciated!

 

I think Jay mentioned that with a dirty throttle body, you can't adjust the screw out far enough to make it idle at the desired 800 RPM.

 

Corey,

Thanks for the response. I should have added that I checked the throttly body, and to the untrained eye (mine), I didn't see any filth. There was no dirt or gunk at all in there.

 

The only other thing I could think of would be timing is to low.
After that, I'm just scratching my head.

Jay should have the answer for why it's doing that then if it's not the TB or timing.
Corey

 

rpeAMP,

A buddy of mine was having the same problem with his Toyota pickup with the 22RE engine. He kept adjusting the idle screw only to have to readjust a week later due to the same problem. The dealership finally determined that the problem was a rubber grommet or washer that keeps the idle screw in a set position. Apparently, the washer had completely deteriorated and the screw would slowly vibrate out of position causing the idle speed to get slower and slower. He hasnt had any problems since they replaced the washer.

 

That's a good one Echo, and I bet often overlooked.
Corey

 

Check your TPS sensor. May be out of adjustment. Check the resistance of E2 and VTA it should hover around 200-800 ohms at idle.

 

Hey echo,


My 87 runner is doing the same thing.... You dont by chance have a part number for that grommet that was afore mentioned?

Thanks,

Mike

 

Hokie97,

Sorry, I dont know the part number. It way my buddies truck that was experiencing the problem and it was the dealership that finally diagnosed the problem and fixed it.

Echo