2002 Chevy Avalanche P0300 code

Tiny
LDLETTERS
  • MEMBER
  • 2002 CHEVROLET AVALANCHE
  • V8
  • 4WD
  • AUTOMATIC
  • 88,000 MILES
Pulled P0300. Changed sparkplugs and wires, cleaned sensor near the air filter. Put water remover and STP fuel injector error still get P0300 error
Sunday, January 20th, 2008 AT 10:40 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfire

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

A Random Misfire code usually indicates a vacuum leak or bad gas.

NOTE: If a misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.
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Sunday, January 20th, 2008 AT 11:07 PM

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