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Noise upon acceleration

 
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Old 03 Dec 2009, 06:31 am
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Cool Noise upon acceleration

Can someone point me in the right direction? I have had two mechanics check my 2003 PT (non-turbo), standard model, and found nothing substantial wrong with it. There is a rattling, almost roaring noise upon acceleration but it does not (thankfully) affect the performance. It's not the transmission. They are thinking perhaps catalytic converter or cv axle. The brakes are new, the transmission has been rebuilt as of two years ago. Water pump replaced one year ago. When they put it on the lift and run it, you cannot hear the noise.
Any ideas? Thanks
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Old 03 Dec 2009, 02:05 pm
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Default Re: Noise upon acceleration

Welcome.
Not much to go on. If it didn't do it on lift (I assume in neutral), the driveline components are suspects - CV Joints, wheel bearings, etc.
An intake or exhaust leak would be there whether in drive or not.

Any vibration felt?
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Old 03 Dec 2009, 04:30 pm
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Default Re: Noise upon acceleration

A bit of a vibration on the floorboard but not enough to upset me! I know, it is a mystery!
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Old 03 Dec 2009, 07:08 pm
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Default Re: Noise upon acceleration

My money is CV joint, possibly wheel bearing. Converter would do it in neutral, and not give any vibration.
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Old 03 Dec 2009, 09:53 pm
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Default Re: Noise upon acceleration

The last mechanic said either CV joint or wheel bearing. But then decided probably CV joint and not wheel bearing. He is hesitant to start repairing things without knowing for sure. Which I appreciate; however, I want the car fixed. I had a friend ride with me today and we turned the wheels sharply to the right and then left and he decided it was not the CV joint based on that. But I honestly do not know and am very frustrated. Thanks for your input. Should I put it in neutral and rev it and see what happens?
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Old 04 Dec 2009, 07:22 am
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Default Re: Noise upon acceleration

Quote:
Originally Posted by ncbeachchick View Post
The last mechanic said either CV joint or wheel bearing. But then decided probably CV joint and not wheel bearing. He is hesitant to start repairing things without knowing for sure. Which I appreciate; however, I want the car fixed. I had a friend ride with me today and we turned the wheels sharply to the right and then left and he decided it was not the CV joint based on that. But I honestly do not know and am very frustrated. Thanks for your input. Should I put it in neutral and rev it and see what happens?
Yes- put it in park and rev it. Point is to see if it is engine or drive components. If noise is there in park, then it's something in the engine.
While it is good that the mechanic didn't want to just throw parts at it, it would seem to me a drive would tell him which it was. Ask around for a good mechanic.
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