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View Full Version : 90mm TB idling at 3000rpm



ls1vt209
December 9th, 2010, 07:39 PM
Ok trying to help a mate tune his car, it has a 226 234 113 cam and have just put a 90mm Pro Comp throttle body and TPIS 90mm lS6 manifold.

I cannot stop the thing from spiting the IAC valve out of its housing (It comes all the way out where we have to remove it and put it back together then reinstall. It also upon firing idles at 3000rpm and will not settle. Please find attached a log and the tune. I have tried many different things to stop it but can't seem to make it idle normally.

95609561

odd boy
December 9th, 2010, 11:01 PM
sounds a mechanical issue with the TB

johnv
December 11th, 2010, 08:42 PM
Or manifold not seated properly, or maybe a vacumme or breather hose problem.

usually cammed cars struggle to get enough air at idle, sounds like you have way to much. is the throttle blade cracked open to much when on the throttle stop ?
is TPS reading zerrow when throttle is closed, may need TPS reset.

SirNemesis
December 12th, 2010, 12:33 AM
If the IAC is spitting the needle, perhaps it is the wrong IAC? It shouldn't do that as the throttle body should physically stop it.

5.7ute
December 12th, 2010, 04:46 PM
Sounds like a manufacturing error in the TB to me. Measure the distance from the IAC valve mounting face to the seat in both TB's to confirm.

ls1vt209
December 13th, 2010, 10:45 PM
All sorted guys, was a problem with the blade and the IAC.