2011 GMC sierra 1500

Asked by Jan 14, 2017 at 03:11 PM about the 2011 GMC Sierra 1500 SLT Crew Cab 4WD

Question type: Maintenance & Repair

number 1 plug keeps going out. for a while we would replace spark plug and it worked for a while. now I replace the plug and it goes back out a few miles down the road. I replaced the wire. Thought maybe it was the wire because for a while everytime I would unplug and replug it would run for a while longer. I cant figure this our  please help. Also my temp fan will come on all by its self randomly. has left me stranded at home a few times due to coming on in the middle of the night. Please anyone have any ideas....

3 Answers

96,265

What do you mean by the plug going out? If it is fouling then run a hotter plug. If it is burning out then run a cooler plug.

96,265

The cooling fan problem might be a bad temperature sensor.

79,115

That fan coming on may be a bad relay, somehow power is getting let threw. The miss on the engine, make sure and check the compression. If you where to check for codes I'm sure this one would come up....P0301 GMC - Cylinder 1 Misfire Detected... Possible causes Faulty spark plug 1 Clogged or faulty fuel injector 1 Faulty ignition coil 1 Fuel injector 1 harness is open or shorted Fuel injector 1 circuit poor electrical connection Ignition coil 1 harness is open or shorted Ignition coil 1 circuit poor electrical connection Insufficient cylinder 1 compression Incorrect fuel pressure Intake air leak... The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem.

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