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96 s10 4.3 vortec high idle please help

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Old 01-01-2011, 07:31 PM   #1
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96 s10 4.3 vortec high idle please help

I have a 96 s10 vortec that idles up when you are driving it and when you stop or push the clutch in it goes to 2000 for a few seconds then drops to normal ive replaced the tps when the check engine light was on it is now off and still idling high this is aggrevating but looks like a lot of people have this problem anyone know what is causing it
Old 01-01-2011, 07:38 PM   #2
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Re: 96 s10 4.3 vortec high idle please help

Yes very common and annoying symptom the 4.3's have with the 5spd. For me I just try to keep my throttlebody, MAF, TPS, and IAC all very clean. I try to clean all these up often and then disconnect the battery to reset them all after you have cleaned them. This seems to help, but what helped mine the most and now it pretty much is completely gone is I had my tuner make some idle air flow adjustments and it acts much better now.
Old 01-01-2011, 07:39 PM   #3
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Re: 96 s10 4.3 vortec high idle please help

Also forgot to mention check all of your o-rings like on the IAC and TPS sensor as well as the gasket for the throttlebody and just make sure there are no vac leaks anywhere.
Old 01-01-2011, 09:52 PM   #4
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Re: 96 s10 4.3 vortec high idle please help

yea I have checked all of that and made sure everything was clean its just to the point now its aggrevating as heck and I cant afford to keep spending money on that one problem everything is new just about
Old 01-01-2011, 11:02 PM   #5
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Re: 96 s10 4.3 vortec high idle please help

Cleaned the MAF lately?

Check the voltage output of the TPS at idle spot (engine off, key in run). Should be near 0.7vdc IIRC..... Assuming here that maybe you didnt get it installed quite right or new one is defective.....
Old 01-02-2011, 12:05 AM   #6
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Re: 96 s10 4.3 vortec high idle please help

I got a new maf and I thought I may have bought a bad tps but went and swapped it everything checked out fine with that im baffled
Old 01-02-2011, 12:38 AM   #7
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Re: 96 s10 4.3 vortec high idle please help

did you try driving with the iac unplugged
Old 01-02-2011, 03:09 PM   #8
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Re: 96 s10 4.3 vortec high idle please help

it stays on 3500 rpm when you unplug the IAC
Old 01-02-2011, 05:20 PM   #9
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Re: 96 s10 4.3 vortec high idle please help

What I did was not saying this is correct but it's better then a high idle... I let the motor warm up and kept it running and unplugged the IAC. Then I use the set screw for the throttle blade to set the idle like you would a carb. I live on the east coast so when it's cold out I have to give it a lil gas to start and let it warm up a minute before I let all the way off the gas.
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