Question about Chevrolet Silverado 1500
Could be one or more of the injectors dribbling. I would cut open the fuel filter to check what sort of contamination is in there and if I found any suspicious crystals, water or very heavy amounts of dirt I would suspect injectors if all other tests were negative.
There was an area in America a couple of years ago where fuel was contaminated with sea salt and that caused lots of injector-related problems.
Posted on Apr 25, 2015
If all cylinders are working properly then the engine is being over fueled drastically. Check to see if fuel pressure regulator is leaking internally. Disconnect vacuum hose from regulator and see if there is fuel in the vacuum line. If there is the regulator is leaking and will certainly cause fuel in the oil and a very rich/poor running engine
Posted on Apr 25, 2015
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Posted on Jan 02, 2017
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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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