Intermittent groaning sound when accelerating

25

Asked by nahmer Oct 26, 2007 at 02:48 PM about the 2007 Chevrolet Impala

Question type: Maintenance & Repair

This 2007 Chevrolet Impala with a 3.9L engine, makes an intermittent groaning sound when accelerating.  The dealer finally had the regional GM engineer ride with him.  He says that this occurs when the car shifts from 3 to 6 cylinders (a fuel saving measure) and nothing can be done about it.  Other than that, this is a wonderful car.  

4 Answers
84,375

littlehorn answered 17 years ago

Sounds like he is telling you the truth. It could just be the switchover from 3-6 cylinders. I would give it time and see if it becomes less noticeable.

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20

Ginger answered 2 years ago

Speed sensor just change the hub assembly its in your hub assembly and I get mine off rockauto there only like 30$ or u can go to AutoZone and its about 100$+ there depends on how long you wanna wait A few days or Now at AutoZone

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20

Ginger answered 2 years ago

Does it do it when you first move from a stop light or a stop sign sometimes in reverse u might not notice it in reverse like you do in drive

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20

Ginger answered 2 years ago

Or If its kinda grinding vibrate try tightening up your transmission pan if the gasket is made of corky material those some how have a way of vibrating loose

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