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bob

bob 8/19/2012

2003 GMC Sierra 1500 SLE 8 Cyl 5.3L

Engine

P0101

Light comes on run fine then goes away

1 Answer


CVO

CVO 8/19/2012

What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.
1. A dirty, clogged or inoperative fuel injector, restricted fuel filter.
2.A burned exhaust valve.

Replace the fuel filter and add a 16 oz Chevron fuel injector cleaner to clean it.

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