Adjusting idle with the screw
Adjusting idle with the screw I need to bring my idle down about 100 RPM's, is it ok to try and use the screw in the T/B for this or do I need to have a tuner go in and do it through the computer?
It idles at around 900 and I just want to lower it like 50, maybe 100 RPM's to tame it down some.
Thanks
It idles at around 900 and I just want to lower it like 50, maybe 100 RPM's to tame it down some.
Thanks
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i think idle would be controlled thru the IAC motor only way to change it would be thru like hp tuners or something similar the screw is like a throttle stop with minimal adjustment
I need to bring my idle down about 100 RPM's, is it ok to try and use the screw in the T/B for this or do I need to have a tuner go in and do it through the computer?
It idles at around 900 and I just want to lower it like 50, maybe 100 RPM's to tame it down some.Thanks
It idles at around 900 and I just want to lower it like 50, maybe 100 RPM's to tame it down some.Thanks
Idle speed is controlled only by the pcm, you cannot change it with the screw on the throttle body. All you do by changing it's position is let more/less air in at idle.....the pcm will compensate and close the iac motor to maintain it's programmed idle speed.
If you want to adjust your idle, you will need to have tuning software such as HP Tuners or LS1Edit.
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Doing this will allow more/less air in at idle but will not adjust your idle speed. PCM will raise/lower IAC counts to acheive desired idle no matter where you put the screw.
I better go out and tell my engine that because it doesn't know. Raised my idle by adjusting the screw, got a code for unexpected high idle, cleared it went out did the procedure with the tps and haven't had a code or pending code. Idle stayed where I placed it.
If that was the case it would still throw a code, by unplugging it and having the pcm recognize it's not receiving a signal it throws a code. Plugging it back in causes the pcm to calibrate for the "new" sensor.
Last edited by mike13; Apr 21, 2009 at 08:12 AM.
