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Why does my car shuff off after running for thirty seconds?

Tiny
JMANCILLA
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 110,000 MILES
I crank the car and its runs for thirty seconds then it shuts off.I replaced the fuel pump and filter. There is NO security light that turns on after it shuts off. Only the battery, oil, and ABS symbol light up after it shuts off. If I press the gas pedal right before it shuts off it will run longer(15 secs more) but it will again try to shut off and I repeat the process. Help!
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Friday, February 17th, 2012 AT 8:49 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure first thn clean throttle plate with choke cleaner on both sides as well as iac valve. Freeze frame teh running and see if any sensors reading out of whack like a map sensor. Check for holes in air duct, if there are duct tape them until you replace the duct. Also check for holes in pcv valve hose as well.
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Friday, February 17th, 2012 AT 9:00 PM

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