2006 Chevy Trailblazer Cylinder#4 misfire

2006 CHEVROLET TRAILBLAZER
63,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BERRYG
  • MEMBER
  • 1 POST
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?
Feb 14, 2009 at 7:36 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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.
Feb 14, 2009 at 7:41 AM
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