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04-27-2010, 05:56 PM
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#1 |
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Registered User
Join Date: Feb 2010
Location: North Augusta, South Carolina
Posts: 22
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Inconsistent Idle
I have a 87 Chevrolet Silverado with a 5.7L TBI. When I start the engine, it idles real low and tries to stall. If I increase the accelerator, it eventually smoothes out and runs fine. Once it warms up it idles high(no tachometer). When I put it into reverse or drive(automatic 700R4) it idles very low again and tries to stall. I have replaced the IAC, Positioning Sensor, and replaced all of the gaskets, o-rings, and filters in the throttle body. I replaced dual 16 gallon tanks with 20 gallon, with new sending units and pumps and fuel filter. I also removed the smog pump and system. This problem was occurring before I made all of these changes. Can anyone give me any suggestions? Thanks.
Last edited by skhurst18; 04-27-2010 at 05:57 PM. |
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04-28-2010, 11:42 PM
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#2 |
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Registered User
 
Join Date: Apr 2010
Location: Memphis, tn
Posts: 65
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Re: Inconsistent Idle
Does it matter if the AC is on or off? Mine sort of idles down when my ac compressor is running then will idle up when it goes off.
__________________
Tim   87 Short Wide 305 TBI 700R4 86 Honda 350x (Resto Project Almost Complete) 07 Trailblazer SS (My Wife's Grocery Getter) 94 Camaro Z28 |
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04-29-2010, 04:53 AM
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#3 |
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Registered User
Join Date: Feb 2010
Location: North Augusta, South Carolina
Posts: 22
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Re: Inconsistent Idle
It idles up if I increase the accelerator slightly for about 30 seconds and then maintains a high idle until I engage the transmission into reverse or drive. Then it begins to idle real low as if trying to stall.
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