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Hanging idel

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Old Aug 20, 2011 | 09:54 AM
  #1  
Marv02's Avatar
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Joined: Dec 2010
Posts: 109
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From: Cal city
Car: 1986 Vett, 2001 Expedition
Engine: 383SBC 435 H/P, 500 TQ
Transmission: 700R4
Axle/Gears: 307
Hanging idel

The motor runs great but the Idel has always done this even when the car was stock.

When comming to a stop or getting off the gas to Idel hangs about 1000 to 1200 RPM's for a minute or 2 before drops down to the set idel of 750 RPM is this normal.

I set the base idel when motor hot set the TPS, reset the ACV, and timming each time it works out great but when drive the car the idel still hangs.


Anyone know why and how to fix this.
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Old Aug 20, 2011 | 03:36 PM
  #2  
skibum2100's Avatar
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Joined: May 2010
Posts: 259
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From: Boulder Colorado
Car: 1988 GTA
Engine: 5.7 TPI w/ Bosch III's
Transmission: T56
Axle/Gears: 3.27 Borg Warner 9 bolt
Re: Hanging idel

Yes, it is normal. I believe that is a design feature of the factory ecm.
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