Question about 2004 GMC Canyon
I had the fuel filter replaced recently but suspect they never really changed
it. I am experiencing rpm variations while idling. Idle is rough. But runs great. Not showing the "old fashioned" bad fuel filter symptoms. Filter looks super east to replace but is it?? How are lines removed?? This is my first "modern age" vehicle. HELP!!
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Posted on Jan 02, 2017
Tips for a great answer:
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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