1999 Pontiac Grand Am Misfiring

Tiny
D76VETT
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 112,000 MILES
#1 & #3 clys. Are misfiring. I put a new coil pack cover on first, this seem to help, but I still got a bucking when I tried to pull out. Then I replaced the fuel filter. This seem to make it worst. Then I put both coils on, and a mougle, all new parts. Still missing on 1 &3. Took off fuel rail, switched injectors, still not firing on 1 &3. Could I got bad parts? Thank You
Saturday, February 14th, 2009 AT 7:41 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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 8:44 PM

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