LT1-LT4 Modifications 1993-97 Gen II Small Block V8

high idle

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Jun 1, 2009 | 01:30 AM

#1

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high idle

i have a lt1, and i started the car the other day, and out of no where, i had i high irratic idle. I tried to adjust the idle screw down, but the idle did not go down, It is idling at like 1800rpm. I think it is something along the lines of a sensor. Does anyone know, what could be the problem? Thanks in advance

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Jun 1, 2009 | 01:50 AM

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try the TPS sensor and the IAC. those are the 2 most common.

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Jun 1, 2009 | 02:50 AM

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TPS and IAC would be the most likely sensors to cause that, but check for vacuum leaks too.

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Jun 1, 2009 | 08:54 PM

#4

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i had that problem too when i put on my 58mm throttle body on my non bored intake and had all kind of surging / high idle issues. now that i got my motor back together with a ported lt1 manifold and ported for 58mm, it idles fine and no issues.

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