Quote:
Originally Posted by vstol
I have a new LS3 427 which has been run and dyno'd. When I start the car it will idle around 1500 then after working the throttle it will pass idle and want to shut off. I have run it about 15 times up to temperature and I have heard it takes the ECM sometime to sync with the engine but you need to be driving it. One thing I find odd is when I put power to the car the throttle body flips open then back to closed, is that normal? Thanks
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If this is DBW the ecu will open and close the tb as part of it's start up procedure. DBW has no IAC, the throttle blade is used as the IAC. It sounds like the tune is really jacked up, usually an unmetered air leak will make it idle high.