Thread: Idle sticking high...

Just future reference for anyone searching, regrounding the tps fixed this. Feels like a brand new car!

how did you ground the TPS? can you take a pic so i can see for my car doing the same thing

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It's the same thing as regrounding the MAF, just do the top(black) wire on the TPS.

edit: I'd make sure to recheck tps voltage after regrounding it, mine was right at 0.44v so I didn't have to adjust it

Defintley start messing with the idle adjustment screw. I think you should put the motor in timing mode and disconnect the TPS. From what I remember, turning clockwise lowers it, counter-clockwise raises it. I just did this on my '97 SE-R after installing Tomei cams, the idle was choppy as hell at 800 so I put it at 1000, all is good.

Yeah my base idle is set at 750

Interesting, yet it's still popping up high? What ECU are you running?

Nooo regrounding the tps fixed it. It runs so much better after doing that lol

Whats the voltage when its closed?

Mine does the exact thing, VE equipped with JWT ECU. Didn't happen in the B15 but happens in the '99 G20. Every time the outside temp changes significantly I have to reset the idle air learning. Try running the motor till it's good and warm. Then unplug the TPS, the idle should fall to 750/800 and stay. Then when you plug the TPS back in the idle should level to what the computer wants it to be, which should be around 800. Sometimes I have to unplug the idle valve as well. I think that is a clue.

I cleaned the idle valve a few months ago and had no change. The A/C sets it back to normal idle almost every time. For me, mostly happens when the motor is cold but yesterday it happened warm and climbed from 800 to 1,800 sitting at a light. I reset the idle air and had no problems so far. I'm pretty sure it the computer doing it, based of what, not sure yet but the wire harness is pretty old and I suspect attenuation, especially after the regrounding you mentioned.

The trick with the ac makes absolutely no sense to me, but it made my idle settle down when it was acting up. Unplugging the tps would let the idle fall to the base 750, as would unplugging the aac most of the time. When the ecu was getting a wonky tps reading while I was running with the aac unplugged for a while the idle would like hunt up and down a bit. You could try regrounding the tps anyway it couldn't hurt