Question about 1984 Chevrolet S-10

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Idles high when warm

Its an 86 2.8 2wd three weeks ago i was running it first thing in the morn. it was doing fine for about 5 min then it shut down, check engine light came on.. since then traced it to, bad fuel lines-replaced new map sensor- new idle controll module, new egr valve- removed and cleaned all air and fuel cavities inside the carb. new fuel pump and filters, tank included. and last but not least all vacum lines replaced still gets stuck at about2000rpm when warmed up. and i have to floor the gas to get it started, when warmed up. runs rough and spits black and blue for short period then clears up if i rev it up high anyone can even give me a good lead, You rock! thanks

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  • drewmercer23 May 22, 2009

    its the first year they had the tbi/carb so it is a throttle body but has several electrical components to tell it what to do. such as a throttle position sensor. idle air controll iac valve thats electrical. those are both operated by the computer to mix the air fuel mixture. out of the two i havnt changed the throttle position sensor truck runs great when cold or not warmed up all the way no miss no smoke great power. idles smooth took it to auto zone did a code retrieval after changing the fuel pump and it didnt read any codes although the check engine light was on.

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With the age of the vehical it might be a good idea to do a compression test first. I would check the timing. Sounds like the engine is advancing for some reason, if that checks out then recheck for vacuum leaks( it could be leaking past the base gasket, vacuum booster, or intake), The vehicle has a carb. not a throttle body injection? Also if you can retrieve that engine code it may be helpful.

Posted on May 21, 2009

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Warm up


The high idle is caused by the choke and the high idle on the carb. It is working normal and you do won't to warm up this motor before going. When it is warm and you hit the gas it activates the choke pull off to bring the idle to normal. Your mechanic is used to fuel injection that will control the fuel/air mix according to temp. I still let my injected cars warm up so the oil can thin a little. If you jump on the highway with cold thick oil it can all wind up in the to of the motor.

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