Upand down idling :-S

[livewire]

Hi everyone

I got my new car yesterday and i noticed a couple of times when idling it will just start adling up and down without anything being touched after a while and sometimes it will sit at around 800rpm steadily and then sometimes around 5/600. Is something wrong? or do they just have dodgy idle sensors or something cause my last 1996 series 2 gts-t didnt do it but this is a 1995 gts-t

[J_R32]

sounds like a tps (throttle positioning sensor) problem, do a search on the forums. other problems could be afm, could be dirty, but most likely your tps on its way out.

[miniofsound]

i have the same problem to 1993 gtst help me if you no what it is plz

[Blue_R32]

i have the same problem. I have found that a quick blip on the gas makes it settle down.

Must be TPS or Idle control valve..??

Mine happens when I am warming car up.

I start it cold, she runs for about 5 minutes just fine, then starts hunting between 500 and 1200 rpm..

[blind_elk]

Usually, a problem in the TPS is a constant high (around 1500 - 2000 rpm) idle. Usually caused by the sensor getting out of alignment and not sending the "throttle closed" signal to the ECU.

Variable idle is usually caused by a dirty / sticking AAC valve. That's the little cylinder on the back of the plenum chamber. It can be removed, disassembled and cleaned out with a bit of Car-B-Clean, then re-assembled and re-fitted without too much drama.

[SERIES_II]

i had the same problem but da thing was dat i took out the screw/bolt out of my plenum thinking it was a point for a boost gauge :S

ur car should be sittin on about 800-1000 rpm so adjust the the screw/bolt until the revs pick up dats wha i did and my idle is fine now

[Jolinator]

could be a vacume leak,

blind elk, thats true however my tps was out of wack in the other direction, what would happen, is it would idle fine, but you woul pull up to a stop sign, dip the clutch and the idle would **** around for a few seconds, worth checking, also the

and low speed driving was a bitch, car runs like crap, i dont think it will see 100% throttle either when you nail it

if your going to adjust idle , disconnect the brown plug on the solinoid behind it when your finished, reconnect it

[SRG33]

Just had my 33 serviced not even a month ago, and after 3 mnths of pretty crappy idling, apparently a vacuum leak near idle starter motor was fixed, afm cleaned, tps adjusted, and timing reset.

Just last week it started ranging again from like 200-1200 rpm up and down as if i was stepping on and off the accelerator...

I have a non-oil blitz pod filter, and a blitz 3inch exhaust.

Any ideas on what else could be causing it in my particular case would be appreciated.

Cheers

-Serge

[The Dan]

Use the force!

also listen to J R32 and blind elk.