I have a 2005 Pontiac grand Prix GT that just started making a loud noise like a motorcycle while accelerating.Do anyone know what that can be?

Asked by Jun 03, 2015 at 01:56 AM about the 2005 Pontiac Grand Prix GT

Question type: Maintenance & Repair

3 Answers

104,235

The only thing I can tell you is try removing the serpentine belt then start the engine and listen, if the noise is gone then you know it is one of the accessorie drives, ie and idler, alternator, water pump, A/C clutch, etc. If the noise is still there with the belt off then it is engine internals. Don't run the engine too long with the belt off, as it turns the water pump.

135

Not trying to be a smart butt... Do you have a hole in the exhaust somewhere? Not completely sure what you mean by "loud like a motorcycle"

1 of 1 people found this helpful.
4,385

I agree, the info given is pretty vague, but a plugged catalytic converter comes to mind.

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