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1999 Pontiac Grand Am popping sound

Tiny
JUAN356
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 168,000 MILES
When my car is on and in park after about a minute of running quietly and smoothly it starts wanting to shut off then u will hear a loud pop coming from some were near the back of the car
Tuesday, March 24th, 2009 AT 9:33 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Could be a lot of things, but I would have a backpressure test performed on the convertor, it may be clogged or partially clogged.

Is your check engine light on?

Other possibilities are EGR valve, fuel pressure.
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Thursday, March 26th, 2009 AT 8:38 AM

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