2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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idle jumping

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Old 04-28-03, 11:50 PM
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idle jumping

my idle us jumping up and down when my car is idleing, what can that be? TPS
Old 04-29-03, 12:01 AM
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yup
Old 04-29-03, 12:08 AM
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which tps is better to get s4 or s5 or is there anything upgradable ?
Old 04-29-03, 12:09 AM
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s5 is a two piece......so the wiring is different from an s4.
Old 04-29-03, 12:11 AM
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STUCK. I got SNOWNED!!!!!

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You have an FC right? That's why the idle bounces.
Really.

I've done just about everything I can think of, cannot figure it out. I'm removing all my emmissions crap next and seeing if that does it

my tps works PERFECTLY and is adjusted EXACTLY to spec
Old 04-29-03, 12:34 AM
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yes i have an fc, so most all fc's do it then
Old 04-29-03, 01:51 PM
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Don't forget - the ECU need good grounds so it's weak little signals can make a circuit.

Bad grounds make it and you go crazy..
Old 04-29-03, 01:54 PM
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Its called a vaccum leak. My car used to do it only sometimes then I removed the rat's nest and went with pre-mix now my idle is at 700 rpms if you don't want to do that then replace all the vac lines with new ones. ALL
Old 04-29-03, 02:01 PM
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Originally posted by Bebesito21
s5 is a two piece......so the wiring is different from an s4.
It's one piece. Just two sensors mounted on a single metal bracket.
Old 04-29-03, 02:17 PM
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check the resistance on your bac valve too...that can affect your idle.

john
Old 04-29-03, 02:23 PM
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mine...

mine has idled funny ever since I installed a BOV.

If I leave the heater on it idles pretty good though, still a little bouncy, but I don't know how bad the TPS is out...I know it is though.
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