[Guest]

I'm goin' NUTZ! I replaced the air idle adjuster in the throttle body and spray'd the whole thing out and have a new O2 sensor in this thing and it STILL acting like it has a mind of it's own. No air leaks noticed so far. My '90 either wants to rev up or just die at idle and it seems to almost lock in 4th gear and "push" me into traffic especialy when cold. I'm starting to think the computer is fried.....HELP?

 

[NIX]

And you checked the EGR and diafram and vac harness O-rings in connector) and solenoid? (Does a '90 still has one?) Is there a pattern in the idling problems? How high does it Idle? Dit you reset the computer? Your system has new components.

 

[Guest]

I replacrd the 'O'ring on the stepper valve and cleaned out the hole with (the most expensive) throttle body spray NAPA had. BUT I NEVER UNHOOKED THE BATTERY! If you think this will reset the thing, I'm all up for that. How long does it have to be off? 10 minutes, enough?

 

[NIX]

I'm not sure. I read stories of 10 minutes up to an hour and even guys that ment they needed to put the key on crank for 10 sec's and putting the + terminal onto the ground. I usualy simply unhook it while i'm busy, so it's longer than an hour. But 30 minutes should be enough, I think....

1 Extra tip is to clean the grounds on the passenger side of the engine. It might help a bit. At least your sure to count that out. (and while you're busy, disconnect the terminals...)

 

[316]

If its a 91 or newer did you check the codes????????

 

[Guest]

As I said on the first call for help, it's a '90 model. My nephew said all the guys where He works at, insist that it's the TPS, next to it, that's causing all the riff raff under the hood. He went on to show me one he had and how they worked and if the voltage went under a certain point in its movement, the 'Puter would do crazy things on the GM's too.... After this, I guess she's going to the shop........

 

[NIX]

Didn't you tell in a former post that you also replaced the TPS? If so simply adjusting the thing, reset and drive for 15 minutes should help. Did you ever put your rig on the computer for a diagnosis?

 

[Guest]

My 90 had the exact same problem as it would erratically rev to 2000 or so and stay there. Great for the transmission when not moving

. I remedied it by blasting the throttle body with cleanser as you did, and replacing the pcv hoses that exit the valve cover. Mine were so encrusted that nothing could get through. I suspect yours are the same.

 

[Guest]

The hoses are flowing fine. I get smoe out of one and the other is on a vacuum line on the intake and doing fine. NO I haven't replaced the TPS on the '90. Just the (stepper valve)idle air adjustment valve with the plunger in it with the 4 lead wiring harness attached to it. I'm off to go get one today....

 

[2853]

I had the same problem. Replaced the TPS and no crazy idle.