Richard Cranium Posted June 4, 2009 Report Share Posted June 4, 2009 Heya guys. The 383 is finally together and we fired it up today for the first time. She fired up and seems to be running well except the idle is high. She should idle at 875, but is idling around 1500 - 1600 RPM. The map sensor reading with the engine off is .99 and with the engine running is between .3 and .35. We assumed a vaccum leak, but all the hoses are new, we've checked and rechecked them (and again). We've sprayed brake cleaner around the intake with no change. What else could cause a high idle like this? Details: 95 Z28 M6 Golen street/strip 383 shortblock Ported stock heads and intake (stock valves) Stock throttle body (until I can get an ASM unit) 42 lb injectors stock fuel pressure regulator Comp Cams XFI cam Long tube headers emissions deleted K&N FIPK Stock MAF PCMforless tune Other than the idle she is running well, no leaks, no smoke, fires right up. What else am I missing? .Rick Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted June 4, 2009 Report Share Posted June 4, 2009 iac motor stuck, or gummed up..make sure the throttle blades are closed all the way. Quote Link to comment Share on other sites More sharing options...
smokin5s Posted June 4, 2009 Report Share Posted June 4, 2009 what's your idle set at on your tune? Quote Link to comment Share on other sites More sharing options...
Richard Cranium Posted June 4, 2009 Author Report Share Posted June 4, 2009 what's your idle set at on your tune? Idle is set in the tune at 875. Quote Link to comment Share on other sites More sharing options...
Richard Cranium Posted June 5, 2009 Author Report Share Posted June 5, 2009 We didn't get a chance to work on it yesterday. Today we should get a chance to look at the IAC, but we'll probably also take a look at the block off plates on the back of the intake. Probably also take another quick look at the throttle body gasket. Quote Link to comment Share on other sites More sharing options...
Richard Cranium Posted June 5, 2009 Author Report Share Posted June 5, 2009 Was a bad IAC. Pulled the throttle body, and plugged the IAC into the harness. Turned on the car and the pin didn't move. Tried another IAC and the pin moved. Installed the working one and she starts up and rumbles now. When we finish getting broken in we'll head over to Dynotune and get her dialed in. Thanks guys. Quote Link to comment Share on other sites More sharing options...
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