2006 Chevy Trailblazer Cylinder#4 misfire

Tiny
BERRYG
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 63,000 MILES
Codes show a Cylinder #4 misfire. Have replaced the plug, coil and boot, and the #4 fuel injector. Still there. Runs great out on the road, but can feel the miss at idle. Changed plug and coil around with another cylinder, but the code stays with #4 cylinder. Any help where to go next?
Saturday, February 14th, 2009 AT 3:36 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the no.4 compression

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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Saturday, February 14th, 2009 AT 3:41 PM

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