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

idle rpm problem

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Old Apr 30, 2013 | 08:59 AM
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Default idle rpm problem

Long story short i'm wanting to get my car dyno tuned here soon, Now i notice while im driving coming to a stop or even just changing gears my rpms raise to about 2000 rpms. Things i have noticed about it is that the rpms will settle but they only settle once my speedometer hits 0 mph. Im curious if this is a mechanical issue or a tune issue, i've researched and couldn't find much on it for lt1 but have found that mustangs have a secondary idle speed to match mph i was wondering if the same was true for lt1s?
mods are in sig and have a mail order from mad tuner


I just want to make sure the car is running relativley decent and in good shape before i have it dyno tuned and everything is all funky.
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Old Apr 30, 2013 | 09:07 AM
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My preview 97 lt1 did the same thing, I think it normal cause I have no performing loss or anything. is your car still run and drive normal ? how long have you had that car.
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Old Apr 30, 2013 | 09:10 AM
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i've had the car for almost 4 years i only noticed this since the head and cam swap, i don't driv eit much and have been rather busy with other events in life to really worry about it. Still drive strong feels great on power, but with longtubes ory and a slp loudmouth 1 it makes you look quite retarded when you come up to a stop sign and your car starts reving up until your speedo hits 0
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Old Apr 30, 2013 | 09:12 AM
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its 6 speed right ? check IAC and TPS
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Old Apr 30, 2013 | 09:14 AM
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tps is good, unfortunetley my scanner doesnt read gm iac counts though, so im not sure on that, i've done the reset procedure though

edit: yes car is 6 speed
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Old Apr 30, 2013 | 09:24 AM
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check vacuum hose, mabe a vacuum hose crack or get loose.
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Old Apr 30, 2013 | 09:25 AM
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i checked for vaccuum leaks back when i first got the car together and couldn't find anything....
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