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1999 Chevy Blazer 99 Chevy Blazer Multiple Misfire

Tiny
CROWNROYAL30
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I have a 99 chevy blazer that is misfiring very bad. I have replaced the cap rotor wires and fuel filter, also the Map sensor. I haven't any other ideas on what it maybe. The computer only throws a multiple misfire code at me.
Friday, October 30th, 2009 AT 7:02 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Multiple 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.
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Friday, October 30th, 2009 AT 7:24 PM

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