What causes moan at 4000 rpm

Asked by Sep 19, 2010 at 04:32 PM about the 1999 Buick Regal 4 Dr GS Supercharged Sedan

Question type: Maintenance & Repair

With the engine in neutral, when I accelerate to 4000 rpm, I experience a moan and shaking at the front of the car. It will reoccur each time at 4000 rpm. What's the
problem.

1 Answer

7,835

sounds like full rpms... shaking might be loose mounts. engine should not move more than 1/2" when shifting the gears.

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