High idle
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Joined: Sep 2007
Posts: 1,356
From: CA, home of the smog nazi
I thought about that, but it used to idle around 1000, 900 when at operating temp. Plus, the RPMs come down slower than they used to with the clutch in. I think I am just going to replace the IAC and see what happens.
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Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
Stock M6 idle is 800rpm fully warmed up. But it has a cam and a program, so without using scan software or asking the tuner, its hard to tell where it should be idling.
When you load the engine with the power steering or the A/C, the IAC motor should open up to keep the RPM within spec. But if the engine is already idling higher than the target set in the program, the IAC isn't going to move in response to the added load, and the engine will slow down. High idle typically indicates the IAC is closed, but the engine is getting air from somewhere else. Or, the PCM has told the IAC to close (counts = 0) but the IAC valve isn't responding.
When the car is rolling, and you put in the clutch, the engine is not going to drop to the "car is standing still" idle speed. When the VSS is indicating the car is moving, the PCM elevates the ilde speed.
When you load the engine with the power steering or the A/C, the IAC motor should open up to keep the RPM within spec. But if the engine is already idling higher than the target set in the program, the IAC isn't going to move in response to the added load, and the engine will slow down. High idle typically indicates the IAC is closed, but the engine is getting air from somewhere else. Or, the PCM has told the IAC to close (counts = 0) but the IAC valve isn't responding.
When the car is rolling, and you put in the clutch, the engine is not going to drop to the "car is standing still" idle speed. When the VSS is indicating the car is moving, the PCM elevates the ilde speed.
Registered User
Joined: Sep 2007
Posts: 1,356
From: CA, home of the smog nazi
To 2manyToyz: Did you ever figure out your high idle problem?
Thread Starter
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Joined: Jul 2008
Posts: 72
From: Upstate ny
^ hey bro I don't think it's ever an issue of high jacking a thread when the info shared helps us all but i appreciate you mentioning it.
as for the idle i thought i solved the problem by retightening the intake and block off plates but within 10 seconds the idle climbed back up over a 1000. Now the SES does not come on until closed loop though were as before it would come on at start up. EGR is throwing codes and I'll need the tune to zap it. Don't know what else is stored because I've not gotten it scanned. Went to AZ and they said they do not do obd I. Had to correct one of the guys when he suggested using a paper clip. So I'll live with it until I can get scanning equipment. The z is not my daily driver anyway.
btw check out my ride along from a few nights ago http://www.youtube.com/watch?v=c4fy2s9zWfU
as for the idle i thought i solved the problem by retightening the intake and block off plates but within 10 seconds the idle climbed back up over a 1000. Now the SES does not come on until closed loop though were as before it would come on at start up. EGR is throwing codes and I'll need the tune to zap it. Don't know what else is stored because I've not gotten it scanned. Went to AZ and they said they do not do obd I. Had to correct one of the guys when he suggested using a paper clip. So I'll live with it until I can get scanning equipment. The z is not my daily driver anyway.
btw check out my ride along from a few nights ago http://www.youtube.com/watch?v=c4fy2s9zWfU
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