what causes the humming in 2005 grand prix


Asked by Jul 25, 2014 at 10:05 AM about the Pontiac Grand Prix

Question type: Maintenance & Repair

4 Answers


Your alternator.

Norm Davis

Common whining/humming noises with engine running in neutral are: belts, vacuum leak, bearing, power steering pump, alternator, AC compressor, fuel pump. With car in motion: wheel bearing, CV joint, transmission gear/bearing, tires. Less obvious humming noises: heater fan, wiper motor. If you can give us the source - where the noise seems to be coming from - it will help a lot.

1 out of 1 people think this is helpful.

I hear it on the driver side under hood or in the car . Sounds like it could be electrical . Doesn't do it in park . I have new belts . kinda loud .


The harder I press the gas the louder . Like its a bad ground for a stereo . I do have a blown speaker I dont know how bad it is . I really want to up the HP on this engine. It does get hot quick I live in Florida . Are there performance parts for a Pontiac 2005 Base model 3800 series 3.8 L . I've heard about bigger injectors ? Is the a chip I can buy to in tune it .

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