Ski89Z28

Ok guys!

I went to my mechanic cause he wants to get into programing and has a 67 camaro with a 327 and wants it TPI, but this is another story.

But he drove the Iroc and was impressed but wanted to see the timing the chip had, it s a TPS Level V chip ( I know and that is why I got the programming stuff). Well it was 20* advanced and I have 8* base set so it is a total of 28*.

But what had us baffled was the the IAC count was at zero!!

So what so you guys think would cause this besides a bad IAC! He said a vacuum leak could cause this and by my track times I think he may be right. So I may get a vacuum gauge and check it out but I wanted to run this by you guys.

Also the EGR is programmed to off if that helps.

GregWestphal

iTrader: (1)

The IAC motor has zero'd out trying to bring the engine speed down to the requested idle speed. I'd say it definitely sounds like a vacuum leak unless you had opened up the throttle body blades using the set screw and went too far...