1998 Chevy Blazer random missfire

Tiny
JOHN GILLENTINE
  • MEMBER
  • 1998 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
I have replaced fuel pump, spark plugs and wires to no avail, exhaust smells bad
Tuesday, January 26th, 2010 AT 9:14 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Randome misfire normally indicates a vacuum leak and bad fuel

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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Tuesday, January 26th, 2010 AT 9:19 AM

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