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1997 Chevy Truck missfire

Tiny
SUGAR BEAR
  • MEMBER
  • 1997 CHEVROLET TRUCK
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 117,620 MILES
Trouble code P0300. Engine misses intermittantly. If code cleared, runs fine for short time. Service eng light comes on. Previous owner said O2 sensor gets wet. Was replaced but problem still there. I see there are 4 of them. Don't know which one was replaced. Unknown age of plugs and wires. Also, miss does not occur under hard acceleration.
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Thursday, December 24th, 2009 AT 2:38 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine misfiring 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
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Friday, December 25th, 2009 AT 2:29 AM

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