1996 Chevy Blazer Miss Fire #1 cylinder

Tiny
TRUTECH
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I have a miss fire on #1 cylinder. I replaced the plugs, whire, cap and roter. Compression good, needle fluexuates slightly on vacume test. Replaced upper intake gasket. Fuel pressure is on the lower side but still in range. Could this be lower intake, valve or just a fuel pump?
Wednesday, January 6th, 2010 AT 11:43 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check injector no.1

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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Wednesday, January 6th, 2010 AT 11:56 PM

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