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Engine miss

Tiny
YESROD40
  • MEMBER
  • 1997 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 265,000 MILES
97 grand am with 3.1 engine still has a miss after changing fuel pump, fuel filter, plugs, plug wires and pcv valve. Whats next to try?
Friday, January 21st, 2011 AT 2:55 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Run a compression test, could be a rocker, pushrod, bent valve.
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Friday, January 21st, 2011 AT 3:10 PM
Tiny
YESROD40
  • MEMBER
  • 2 POSTS
It very well could be a rod. When pump went and wife was trying to start it she said she heard a "pop" up under the dash at one point. The miss got bad after I changed the fuel pump. Didn't notice it before. The car runs with power but cant cet the niss out. Its most noticable when I have foot on gas peddle. The order of cures I tried was filter, then plugs and wires, then pcv valve.
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Friday, January 21st, 2011 AT 3:32 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Remove valve covers and plugs, rotate engine by hand and observe rocker arms.
The "pop" could also be a pushrod.
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Friday, January 21st, 2011 AT 3:40 PM

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