I have a 99 Pontiac Bonneville the problem I am having is their is a knocking noise when I drive and when I stop it makes a popping noise. please help

Asked by Dec 02, 2014 at 11:25 PM about the 1999 Pontiac Bonneville 4 Dr SE Sedan

Question type: Maintenance & Repair

3 Answers

385

Read the "Service Issues" on the Pontiac V-6 here: http://www.underhoodservice.com/servicing-gm-s-3800-v6-engines/ The sounds you described remind me of a worn timing belt/jump timing, but it could be caused by many things. I would get a mechanic to check the engine timing, then move through other possible causes like a dead coil pack, gasket leak, ECU problem, etc.

It doesn't have the check engine light on

385

Could be poor/bad gasoline causing knocking and detonation, but I would still have it looked at even if check engine light is not on.

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