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2004 Pontiac Grand Prix check gas cap

Tiny
DOE773
  • MEMBER
  • 2004 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
My issue is my check engine light keeps coming on. Because the check gas cap light came on I replaced the cap three times (factory caps) and it still came on I dont understand what the issue is.I am burning more gas and dont no why. Please help.
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Friday, June 18th, 2010 AT 10:29 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Take off the purge solenoid and pressureize it. No flow should go through it. Then energize and it should allow flow. If it flows both times energized or de energized its bad.
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Sunday, June 20th, 2010 AT 10:46 PM

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