Question about 1997 GMC Sierra
Try to check that the fuel injector, using a fuel injector tester, is getting an electrical pulse as indicated by the tester lighting up and blinking periodically.
Also, one can check the injector by putting a stethoscope on the injector and listening for a loud click.
Also, check that antifreeze is not leaking into the cylinder causing the plugs not to fire. How did the plug look that was replaced? It should have had a light brown dry appearance if normal.
Posted on Oct 07, 2010
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Posted on Jan 02, 2017
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