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2003 Pontiac Bonneville p300 p420

Tiny
KNISALAD
  • MEMBER
  • 2003 PONTIAC BONNEVILLE
  • V6
  • FWD
  • AUTOMATIC
I've had this problem for over a year now. Sometimes car idle smoothly, others it chugs hard, almost stalls itself out/ battery fluctuates. When accelerating easy it runs normal. When accelerating heavy there is a loud chirping/ squeeking noise, then the engine shakes violently, and has very little power. Replaces MAF sensor/ air filter one year ago. Spark plugs/ fuel filter 2 years ago.
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Saturday, April 18th, 2015 AT 9:27 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Code 300 is a misfire and a pro should diagnose this as it can lead to buying a lot of parts that are not needed. Code 420 is a converter code which means if it's not a bad O2 sensor or air leak prior to converter you need a new one which you didn't post mileage so I suspect it's a lot on the car.
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Saturday, April 18th, 2015 AT 10:32 AM

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