Celica Forums General Discussion General idle is going up and down

when @ idle my car goes between like 500rpm and like 1200rpm just going up and down up and down. wtf is going on here? that happen to anyone here on their celi.

MAF sensor. It is the sensor on your intake. Mine did it, and many others did it when they got dirty. Just take that sensor off and give it a good cleaning, and you will be ready to go.

yups clean the MAFS

Clean your IAC (Idle Air Control) valve. It's a little square inlet inside your throttle body, facing towards the front. It gets clogged by oil and gas vapors from the PCV system, and gets stuck every now and then, causing an irratic idle.

if thats not it i had to change plugs once and that worked

Thanks a ton. I"m almost done changing motors.

Yeah thats what i just went through with my GTS. I cleaned the MAF and IAC and still had the problem. The dealer wanted $1100 to replace the IAC but i bought the part myself for $190 and installed it.

can someone take a picture of the IAC, just to have a better idea of what i will see, also do i used the same stuff that we use to clean the maf, to clean the IAC??

i'll take a pic and someone can tell me if it's the right thing.

ok maybe I won't. my camera is in jeep and jeep is out of town w/ wife.

yeah clean throttle body too..

WTF are they smoking?

The actual IAC housing is bolted to the bottom of the throttle body. The inlet to it is inside the throttle body, on the bottom half facing the front, right before the throttle plate. It's a square shaped hole. Just spray a ton of throttle body cleaner into it and let it sit for a few min, then start up the car and let it idle for a while to flush out all the gunk.