cold idle

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Nov 30, 2009 | 08:18 AM

Prin

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From: Huntsville, AL

cold idle

Ok, I recently did more work to my ride. I did the whole forged rotating assembly as well as added a FAST 92/92 combo. Well, now, the car will not hold a cold idle. I replaced the IAC motor and still nothing. It will go dead if you let off the pedal. Once it warms up, I can hear a huge vacuum take over and the car then idles on its own. What do you guys think?

Nov 30, 2009 | 08:20 AM

teke184

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From: Key West, Florida

the vacuum sound is likely just the added noise from the FAST intake.

i noticed it as soon as i put mine on....sounds like a vac leak...but it doesn't appear to have one.

Nov 30, 2009 | 08:48 AM

Prin

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From: Huntsville, AL

Yeah, I think that is what it is. But, what about the cold idle?

Nov 30, 2009 | 09:28 AM

youguessit

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From: Houston

check to make sure the map sensor on the back of the manifold is not leaking vacuum. This could give it a hard to start till it warms up.

Nov 30, 2009 | 09:30 AM

ramair21

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From: Cali

I just replaced my TB with a S3 polished TB. After i installed it i could hear my intake suck so much air, i thought it was also a vacuum leak. I had to use HPtuners to tune the Idle Airflow and IAC steps for start up since i was sucking so much air. I also installed the LS6 intake after the TB. You might be in the same boat i was in