Hi All:

I have been chasing a major ghost in my car. I have a high idle and I have checked everything that would normally be wrong....none of which is the problem so I am suspecting the PCM is screwed up.

Anyhow, I have a question:

Does anyone know what the normal IAC counts should be for a 2002 2.4L Z24 while at idle?

Thanks in advance
radarcav

you ever switch out your tps?

oh, and do you mean the voltages for the iac?




Peace Out!!!

what are normal iac voltages? as far as iac counts, before my car got all screwed up, my iac it idle like around 20-30... now its up to 60.... and im trying to figure it out

Enrique:

I measured the idle and WOT TPS voltage and they were 0.45V and ~4V. The TPS is working fine.

The PCM controls engine idle speed with the IAC valve. To increase idle speed, the PCM retracts the IAC valve pintle away from its seat, allowing more air to bypass the throttle bore. To decrease idle speed, it extends the IAC valve pintle towards its seat, reducing bypass air flow. A "Scan" tool will read the PCM commands to the IAC valve in counts. Higher the counts indicate more air bypass (higher idle). The lower the counts indicate less air is allowed to bypass (lower idle). A garage down the street measured the counts on my car and it was 60. Also, if you open the TB (going from idle to WOT) the counts "should" change, but in my car they are frozen at 60. This means the IAC pintle is being instructed to stay in one spot all the time. This is not normal.

z24buzz7

Sounds like you may have the same fried PCM problem that I do. But I would check everything else before making that decision. I checked every single thing (sensor, valve, hose...).