kambodianboi

I've been having this problem for quite sometime, like a year-ish. Basically my idle would go up and down here and there at a dead stop. Also coming to a stop, it will do the same thing.

Here is video I recorded, just bleeping throttle will also cause it to do it too.

Not sure if it's my MAF or IAC or some other sensor.

I've had the engine rebuilt 4-5 months ago and got it tuned 2 months ago. The car have no issue driving, I did a boost leak test and there isn't any leak at all (tested up to 25psi). Also there is no CEL.


Any idea what it could be.

Nohatn

iTrader: (1)

its saying drive me!!!

IDK mine does it to after driving a good amount of driving...

MrJuls

Mine did it too,and it was the IACV.

kambodianboi

Alright, I'll go ahead and get another IAC and see if that resolves the issue.

The Juice

I second the IAC. I know its a different platform, but the IAC is a common culprit of a hard to diagnose vac leak on MKII Turbo MR2's.

TurboTal

iTrader: (3)

IAC is what the video looks like but if that's not it.

Then it might also be a bad front 02 sensor. When in closed loop fuel trim operation (as it would be during idle) the front 02 is responsible for telling the ecu if its rich or lean. If the signal is skewed fuel could be added and leaned at the wrong reading, causing the idle to change.

kambodianboi

Took out the IAC and tested it, it works as it should. Also swapped from another EVO, still have the same issue. I'll see if I can get the car logged, possibly see if there is something unusual.