koolakat

Strange Idle
i just got a 91 n/a and i have some funky idling problems.
It wants to idle at like 3k and i can't trun it down
it's been ported. so i know that it will idle high but not that high i know with the 88's and down there's a jumper thing to set the idle is there one for the 89's and up some one help before i blow this thing up.

kick7ca

it's supposed to idle at 3k when started to warm up the cat, but should fall afterward.

check throttle positioning sensor for idle I think

koolakat

ya i know about the strat up but it just stays there i replaced the tps and tested it thats not it sorry

koolakat

any other ideas thanks for trying to help man

koolakat

BUMP

koolakat

bump

SureShot

Sounds like maybe an air leak?

Bruce

My car does this to sometimes. All I usually have to do is give the gas pedal a quick tap and the Rpms drop down to 1500.

Rx7Nub

It is probably a vacuum leak somewhere, spray carb cleaner everywhere in your engine bay and if the idle changes, then that's where the leak is.

jon88se

it could even be something as simple as adjusting the throttle cable...over time they get stretched and have too much slack etc...or they may stick, so check it out. also, 1500 rpm is way to high of an idle. A properly warmed 13B should idle around 750-850 depending on were u have it set. How smooth it is depends on TPS, vacuum leaks, or simply playing with the Lean/Rich idle mixture screw.