My Cooling Improvement Project (hopefully)

[quote="Dart67";1969981904]
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I will have to send my XFI ECU back to FAST to have the IAC drivers repaired.

For now I am going to go back to a carb temporarily.

Herb[/quote]

You should run this by FAST before returning the system. I don't see how the IAC could cause it to overheat. The IAC controls air flow to the motor. The computer will sense that (via MAP, then O2 sensor) and add the appropriate fuel to keep the mixture proper. The result is that your idle speed will be too high, but it will not run lean.

If you don't believe this, try a simple test on any of your modern cars. Pull the vacuum hose off the brake booster, which simulates a stuck-open IAC valve. The engine will speed up, but will still run smooth, without the shaking of a lean condition.