alamantia

iTrader: (10)

I installed a TR230 on my 2002 Z28 and sent the PCM out for tuning, I am happy with everything but one small issue.

On a cold start the car it idles just fine.

If I drive the car to operating temp and shut it off for a few minutes, to get gas or run into a store or something, when I get back in the car and start it, it hunts for idle for about 30 seconds.

I have heard of drilling the hole in the TB plate to a slightly larger diameter, would this solve this issue?

Why cant the PCM just be calibrated to give me a few more clicks on the IAC under hot start condition?

Darkman

iTrader: (2)

Do not drill the throttle body - the holes will be there without regard to temperature. The problem lies in your tune - it is not perfected yet.

(I have had that same symptom after a cam install & tune and ultimately my tuner was able to fix it.)

-Q-

iTrader: (10)

Mine did the same thing. Darkman is correct in saying that it is definitely in your tune...My tuner was able to get that out for me as well.

Sprayed1998

iTrader: (10)

Your base idle airflow table is based off coolant temp, getting it dialed in will go a long way in getting your idle dialed in. Also see what kind of timing your running at idle.