Question about GMC C1500
Check for vacuum leaks..get a can of spray
gumout, spray the vac lines and maniflod area, when the idle changes,
youve found the leak! You want the engine running and spray on the
outside but do direct the stream onto the hoses, if it is a vacuum
leak, the engine idle will change speed, then you have detected a leak,
repair the vacuum leak and see how it runs! If that doesnt do it, you
may need a new idle air control valve, it's bolted to the throttlebody.
If you have one of the oil soaked air filters, change the MAF, cleaning
wont work! I have done a few of these for this, and GMC has a TSB on
it.If this does not do it.
Pull the IAC off and see if it;s loaded up with carbon, if it is I replace them, cleaning doesn't usually work! Use some throttle body cleaner on it
Posted on Jul 15, 2009
The TPS may be bad, evin though it tested good. Before you replace it try this. Clean the throttle bore and do a basic tune up. The throttle bore is the part of the engine that takes in the air. This is where the throttle cable attaches. Clean the inside by spraying the inside with carburetor and choke cleaner and using a cloth to wipe it clean on the end of a long screw driver. Then the tune up is plugs, wires and a new fuel filter. This should get you back in business. Hope this helps. Please re-post with updates or more questions. If this answers your question then please accept and rate. Good luck. Thanks cj2176.
Posted on Jul 15, 2009
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Posted on Jan 02, 2017
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