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Join Date: Jun 2001
Location: Kent. UK. 944s2--'89
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It's still there.

I thought I'd sorted this, but I haven't. This sound is getting to me! If you drove along a road that had a small diameter rope stretched across it at equal intervals you would get a sort of soft thud thud thud sound from the tyres, well that's the sound I'm getting, from a perfectly smooth road. It is most pronounced when approaching a junction ( possibly on the overrun ) to add to the mystery it isn't always apparent. Can any of you guys point me in the right direction for a cure? As usual all replies appreciated.

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Old 10-18-2003, 03:10 PM
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Any sound that is the same frequency as a rotating wheel is a bad tire or bearings or CV joint's. If it's a bad tire you may play hell finding it. If it's a bad bearing just jack up each wheel individually, put one hand on the backing plate and rotate the wheel. You should be able to feel it. CV joints you may or may not be able to feel it.
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Hugh - So Cal 83 944 Driver Person
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Old 10-18-2003, 03:19 PM
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I have checked the tyres, but will recheck, I had thought of bearings, but thought these would be noisy all the time, and after reading up on the changing procedure for s2 It seemed quite involved unless I was more convinced. If I had to point to the location I would say l/h rear. Will try your tests SoCal. The shafts move in and out a little but other than that no movement, but I suppose that doesn't prove much! Thanx.
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Old 10-18-2003, 03:50 PM
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is it really cold when you drive? sometimes a car sitting in cold weather gets flat spots on the tires, that would explain it's infrequency.
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Old 10-18-2003, 04:03 PM
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Sometimes you can isolate the CV noise by driving in tight circles in a quiet parking lot and listiening. The small tight circles will stretch and load the axles and the CV's. You will hear it for sure. Have your passenger stick their head out the window too.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 10-19-2003, 11:43 AM
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a nail in the tire, been there.
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Old 10-19-2003, 12:59 PM
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Suggestions noted with thanx.
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Old 10-19-2003, 01:23 PM
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If you could tow your passenger behind you on a skateboard, so much the better!
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Old 10-19-2003, 02:07 PM
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Is that an item of porsche diagnostic equipment, if so have you got the part number?
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Old 10-19-2003, 02:21 PM
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
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Providing ignorance one post at a time.
Old 10-19-2003, 03:21 PM
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How hot is it Todwic?
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 10-19-2003, 03:49 PM
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not right, at all.
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*Disclaimer: The person above is actually dumber than he appears.
my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements
'84 944 auto/ps/ac/cc
'86 951
Providing ignorance one post at a time.
Old 10-19-2003, 10:56 PM
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Quote:
Originally posted by hoover
I had thought of bearings, but thought these would be noisy all the time, ....
no sir, it is quite common for an uneven, rough, or less-than-perfect surface to mask many a vibration or noise within the drivetrain. hence, driving on smooth pavement can be a very good way to ascertain if all is well. the smoother the road, the more you'll hear. check SoCal's suggestions. they were my first guesses as well

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Old 10-20-2003, 12:01 AM
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