Question about Chevrolet 1992 Chevy Pickup Body T E Maxx Rock Crawler Rc Truck

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My 92 K1500 5.7L TBI has a high idle and when at operating temp it wants to die in drive

My truck starts with high idle then when wormed up it while driving it wants to die. starts fine but when it gets worm it idles down and wants to die in park

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Could be a voltage problem or an idler pulley problem.

Posted on Nov 23, 2013

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1988 Suburban with 5.7 TBI runs fine until warms up. Goes to fast idle and when it comes off fast idles won't start back until cools down.


Lets start at the beginning. Is the check engine light on ?
You have an idle air control valve which could be sticking open or shorted to ground. You should be able to unplug it to test. There also could be a gasket or hose that is opening up and causing a huge vac leak.

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I have a 90 silverado 5.7 an it just started to idle very high then low cutting out popping an dying on me. I noticed it will start an run fine until it gets to operating temp. Then it acts like sumone us...


Have you tried cleaning the MAF sensor. This sensor is by the air filter box. The mass air flow sensor has to be cleaned with a special spray that you can get at any auto parts store. Do not, I repeat do not use carb cleaner this will ruin it. It is basically a thin filament housed in a grid where the air flow goes through and if it gets coated by dust, oil, or burning to rich black soot this will throw the signal off just enough at the computer.

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Fuel injection needs 20-30 pound pressure to fire the injectors. Try to check pressure before filter. If its low your pump is no good. If its ok then you have pressure drop after the filter. Filter on backwards or clogged.

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Your egr.valve may not be functioning good chanse its got carbon build up, or there is no vacume to it, remove it and clean it with carb cleaner, both the valve and the intake.

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You could have a bad gasket under the TBI that is allowing uncontrolled air to enter the engine or an Idle Air Control Motor that is not working properly.

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1 Answer

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Check your idle control valve. You might have to replace it, 80-90 bucks new. Or see if there is an air leak from the intake manifold. had the same problem.

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