Question about 1993 Chevrolet C1500

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I can spray startr fluid and it runs. But idle speed is high. Any ideas C1500 5.7l Silverado

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If the engine has Throttle body Injection TBI, I believe there is an idle speed module on the side of the throttle body which may be bad. Try unplugging the module and see if the idle changes.

Posted on Jul 23, 2009

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Throttle gasket leaking or vacuum leak of some sort

Posted on Jul 23, 2009

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check for vacuum leak or intake gasket spray starting fluid around vacuum line if it speeds up check that line also I believe that is carb. check base gasket

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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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My 91 chevy silverado keeps stalling out when i put it into gear. idles fine and will drive sometimes normaly stalls at initial start. once it has gotten warm dosent seem to die out. we have checked the...


This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 (1996 and newer) or a OBD1 (1995 and older) fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control


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I have a 1984 nissan 720 pickup truck that i noticed idles high when stopped, then the idle goes low then high and back and forth. What is causing it?


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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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I would look at the EGR valve and test whether the diaphram is ruptured. Then if not successful look at any idle speed "motor".

If that is not successful, look at the intake manifold. With the engine running, get a old spray bottle and spray water around the seams of the intake while the engine is running. Any opening will draw in the water and stall the engine or reduce RPM. That is how you find the leak.

The reason your car is idling high is when you open the throttle, more air goes in the engine. If there is an air leak that does not belong there it will raise the idle just like your foot pressing down on the accelerator.

The car is hard to start because the air/fuel mix is flooded with air. You are not getting enough fuel for the volume of air that is entering the engine.

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ngine stalling and rough run issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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With the engine running take a can of aerosol spray WD-40 and spray it at the vacuum lines, the throttlebody and the intake manifold gaskets. At one point you should here the engine speed decrease. If you do, concentrate the spray around the area until you are able to pinpoint the vacuum leak. If you don't find a leak, try clamping the line to the brake booster with your fingers and see if that makes a difference in the idle speed, if so the diaphram is at fault and needs replacement. Thanks, Dana

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Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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2 Answers

99 Dodge Durango Dies When Slowing


Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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