2005 Pontiac Grand Prix 3.8 liter. Question: We have a 2005 Pontiac Grand Prix GT 3800 series engine and the car makes a whirring noise (Sound like a manual transmission in reverses) when accelerating from a stop. It first started only when turning but now does it heading straight also. Any ideas?
Answer: If the noise you are describing is related to engine speed, and not vehicle speed, then you may have low power steering fluid, or another belt driven accessory making the noise. Check the power steering fluid level first.
If that is ok, then a belt idler pulley or alternator may be the culprit. Removing the belt and starting the car for a few seconds will at least tell that it is drive belt related or not if the noise goes away.
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