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Old Oct 29, 2007 | 11:01 AM
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one44magnum's Avatar
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Default running problems
i have a 89 z71 4x4 that starts and idles rough when cold,then idles to fast when it warms up...anybody got any ideas?
 
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Old Oct 29, 2007 | 11:03 AM
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Default RE: running problems
89z71 that starts and idles rough then idles to fast when it warms up..any ideas??
 
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Old Nov 2, 2007 | 08:28 PM
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Default RE: running problems
Howdy, one44magnum. The throttle position sensor (tps) has gone bad from your description.
 
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Old Nov 7, 2007 | 07:58 PM
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Default RE: running problems
89? tps wasnt introduced till 04 I believe, argon could shed more light on that. Check your basics first, fuel filter, air filter, spark plugs, wires, injectors?
 
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Old Nov 8, 2007 | 05:49 AM
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Argon's Avatar
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Default RE: running problems
TPS was introduced in 1987 on pickups...

as for the problem..it may be overfueling...maybe a map hose....any codes/?
 
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Old Nov 8, 2007 | 06:55 PM
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Default RE: running problems
Thanks for that info, I heard someone else mention the tps before, and ive never seen a tps on a pre 04 truck.
 
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Old Nov 9, 2007 | 05:15 AM
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Default RE: running problems
any pcm controlled engine has a tps...throttle body pickups...even older caprices and stuff with carbs
 
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