When the motor heats up, the spark plug on the driver's side become black and the exaus smoke comes out black too. What can cause this problem?

5

Asked by Danny Mar 08, 2015 at 08:52 PM about the 2005 Chevrolet Silverado 1500 LT Crew Cab RWD

Question type: Maintenance & Repair

I have a Chevy 1500 LT 2005 with a 5.3 vortec

5 Answers

50,605

This sounds like your burning oil in the cylinder. Either you have a broken piston ring, or you may have a valve guide letting oil into the cylinder. When you say the spark plug on the driver's side becomes black, do you mean on the outside of the plug, or on the plug itself when it is removed from the cylinder head? If it is on the outside, you may have a valve gasket leaking on it or you have a cracked cylinder head that is leaking oil into the cylinder and onto the plug itself on the outside. Have a compression check done on all cylinders. If there is a crack, leak or bad valve guide it will show up. You also may have a hole in the cylinder. Does the engine run ruff? Check the oil and see if water is getting into the oil. That may indicate a head gasket or cracked head. Good luck.

1 people found this helpful.
10

I’m having similar issue but mine just blacks out rear plug causes miss haven’t figured issue yet also strong fuel smell. I think bad injector

1 people found this helpful.

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