Question about 1993 GMC Sierra K1500

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I am working on a friends car it was idleing up then down up then down i took the I.A.C sensor off and cleaned it with some throttle body cleaner. and it fixed that problem but one other problem it is having is when you press the gas pedal it bogs down and wont rev up im thinking it might be the fuel pump but im not to sure. i know that it is making some sounds.

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Ck the tps

Posted on Nov 17, 2009

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Could also be a fuel injector, ohm out the injectors, if there is a bad one the value will be way off.

Posted on Nov 17, 2009


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Why does my 94 Cherokee laredo idle high?

Vacuum leak, idle air control motor and solenoid, stuck throttle cable if equipped, throttle position sensor

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How can I fix high idle?

In theory once the desired idle speed is programmed into the management system, in the absence of such faults as air leaks, sticking idle air control valve and suchlike it should be impossible for the idle speed to be much different from the programmed value because the ECU should continue closing down the amount of air bypassing the throttle butterfly until the idle is around the correct value.

I think you need to go back to basics and double-check the work to ensure everything is as it should be. In the absence of mechanical faults and ignoring the possibility of electronic problems a high idle must be caused by too much air entering the engine, either because the idle air control valve is not closing properly or because the throttle butterfly is not closing fully.

It is worth noting air can enter the intake through leaky diaphragms, split vacuum hoses or faulty pcv systems. It is also worth checking the egr valve if fitted.

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On a dodge neon 2004 the code reads P0507 idle control system. Is that a sensor?

No, it's not a sensor. The engine computer controls idle speed by an "actuator" called an IAC -idle air control -motor or valve. It sits right on the throttle body where the air hose, the big boot, connects to the top of the engine. It controls the idle air passage-smaller air passages besides the larger throttle plate opening- according to computer command.
Probably your IAC motor or valve has a problem. A good cleaning often helps. Remove it and scrape off gently the deposits. Don't push the end piece, the pintle, back and forth, and don't spray cleaner up towards the little motor. Check the air passages where it mounts on the throttle body and clean as best you can. If it needed cleaning, take off the big boot and use a sensor safe cleaner, like throttle body cleaner, and old rags and old toothbrushes, and clean out the inside of the throttle body and the big butterfly valve, the throttle valve, inside. Note that when it is at rest, no gas pedal giving it gas, the throttle valve is almost completely closed. Those separate air passages in your idle control system, what the IAC motor controls, is the only way for the engine to get enough air to keep running. If they clog up, or the valve or motor doesn't work anymore, anyway the computer sees a wrong result from engine rpm sensors, and what it is commanding from the IAC motor, so it alerts you the problem is in the idle cntrl system. Have at it, friend. It's either do it yourself or pay labor costs for a pro.

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The engine computer controls idle speed through the idle control valve. Sometimes the air passages this valve controls get gunked up and don't perform well, don't let enough air through. Cleaning them out may help, also give a good cleaning to the throttle body assembly. Use a throttle body cleaner, a good sensor safe cleaner, not regular carburetor cleaner.

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Engine fluctuating and cutting out all the time when slowing down to stop cos the revs drop too low


If engine revolutions are going up and down even when you are driving, then you have a problem with the EGR valve.

If problem is only when engine is idle, most common fault is the IAC (idle air control) valve, which regulates air when engine is idle. If IAC is OK, check air intake and the sensors installed in the air intake (MAF and IAT). The sensors detect the amount and temperature of air coming into the intake and determine the right amount of air to be mixed with fuel and injected.

There are more problems that even if less frequently can cause rough idle. A good thing to do would DBII DTC scan can be done for free at the nearest Autozone.



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2006 chevy express 2500 van with 4.8L idles really low, when you floor it it bogs down, after you let off the gas it dies, replaced the fuel pump already

Clean the throttle body with throttle body cleaner and make sure the air filter is not dirty or plugged.Also clean the mas air flow sensor with mass air flow sensor cleaner.Give this a try and let me know if it took care of your problems.Hope this helps.Good luck.

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Wont idle down

your IAC idle air control sensor is probably gunked up and if it is so is your throttle body...also check all vacuum line for integrity..i found a bad hose going to my MAP sensor..both of this caused problems.
Clean the IAC with throttle body cleaner not carb cleaner, and dont clean the map sensor its contolled by air vacuum, just replace the hose if found cracked, if its bad you have to replace it it cant be adjusted.

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Will not hold idle, runs fine at speed

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Will not idle

I had the same problem... frustrating.

I picked up a repair manual at the parts store. I took off the throttle body and cleaned it with throttle body cleaner spray. I changed the Idle Air Control Valve (idle speed motor) which was very clogged. While I had the throttle body off I also changed the Map Sensor and Throttle Position Sensor. The manual will walk you through the steps. I had never done anything like this before. If I can do you so can you.
My Jeep has never run better. Good Luck

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