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 Mar 08, 2015 at 08:52 PM about the 2005 Chevrolet Silverado 1500 LT Crew Cab Short Bed 2WD

Question type: Maintenance & Repair

I have a Chevy 1500 LT 2005 with a 5.3 vortec

2 Answers

13,095

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.

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Black exhaust defines high carbon production, high gas pressure

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