2003 Chevy Impala failed immssion test

Tiny
SCUBARAY
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
Hi, my chevy impala failed imission test and states that missing on cyln 6? But it runs great
Friday, December 12th, 2008 AT 6:16 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Misfire at no. 6 -check the sparkplug, compression and injector on that cyl.

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, December 12th, 2008 AT 6:29 PM

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