Hydro

My car was sitting for about 2 weeks, and when i started it up it idles very low, at about 100rpm, instead of the usual 900-1000rpm, does anyone know what the problem could be?

thanks

imported_zc_hatch

100rpm?
did it even run?
injectors dirty?

cee_mon

Unplug the IAVC and with that disconnected it should run at 550 or so.
The IAVC connector is on the backside of the intake manifold. With that unplugged you can then make changes to your idle with the Idle screw right on the throttle body.

Hydro

thanks guys, do you know what the ideal rpm for idle is when the car is warm?

dee123

About 500-650.

1sloweg

750 is stock idle. 500 is too low

cee_mon

750 is right around the magic number. The car will stall out at anything below 500....trust me I know, I went through this all before. On your tach gauge it will seem like it is in near even 100-200...when really it is about 500 or so. Did you try and unplug the IAVC and see what your idle is WITHOUT the help of your computer? This way you can see if your computer is the problem or mechanical.

imported_kIeRaN

did this work for u? the same thing is happening to my car now and i wanna know if it fixed the problem

cee_mon

I dont know if you were asking me....but if so....Yes it did fix all my idle problems...It also fixed the in-motion stall when i push in my clutch and the rpms fall to fast.

imported_esp

my RPM sits at 500-600 after the first year of owning my car. And I bought it brand new. Should I be worried. I have driven it 6 years and 255XXX km now?

Once in a blue moon, when I have the A/C on a hot day, coming to a hard stop, the RPM drops to 200 and comes back up to 600.

imported_kIeRaN

i ahve been having idling problems ever since i did my swap, at first, the lowest it would idle is 3000 rpm so i unplugged the IACV thingy and now my car idles at about 600 rpm, i need help

imported_GoldBadge

Idle at 3 grand?

dee123

Vacuum leak.

imported_kIeRaN

yup, idles at 3 grand, i unplugged the idle control valve thingy on the back of the intake manifold, now it runs at 500 rpm and thats the highest it revs at

dee123

did you check power and ground to the iac? Also check for damaged wires. On GM 3.1's, if you disconnect the battery, the iac goes nuts. If you take it out, it has aplunger that gets gummed up. Spraying 'cleens' on it and pushing the plunger all the way solves the problem. Try that on yours. Make sure plunger is moving freely.

p.s. the engine looks good. thanx.