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Old 15-11-2008   #1
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Unhappy Erratic knocking noise

Any thoughts on this one. My B has developed a strange knocking sound. It does not happen all the time. It does not appear engine related as the engine revs smoothly when stationary.
It appears to come from the front offside wheel area. (I have recently changed the tyre here that was badly worn on the inside - it had started before this was changed).
Sometimes I can drive 40 miles without any sound - then on the way back you get this alarming knocking noise.
It seems to be when the the engine is under load - if you come of the gas it frequently stops.
Sometimes I get it when travelling slowly when taking a sharp turn i.e with the wheel on full lock.
Have had the brakes checked recently and no problems. I do need to replace a rear wheel bearing.

I have checked the cv gators these are ok.
There is some play on the drive shafts both sides .. but only a couple of mms.



Any guidance would be appreciated.
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Last edited by Norbiton; 15-11-2008 at 15:52. Reason: Update
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Old 15-11-2008   #2
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Re: Erratic knocking noise

check the wheel nuts are done up.
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Old 15-11-2008   #3
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Re: Erratic knocking noise

Sadly not that simple - all nuts are tight.
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Old 16-11-2008   #4
Ban the Mongol rally
 
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Re: Erratic knocking noise

There are loads of posts on this topic. When in the Barchetta section below the heading and to the right there is a "search this forum" tab, lot's of usefull previous posts will emerge.
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Old 17-11-2008   #5
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Re: Erratic knocking noise

Quick update to this post : I have determined that the knocking is getting worse !! However it stops when I press the clutch down. So I guess it isn't a suspension issue.
Looks like clutch or drive shaft ?
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Old 17-11-2008   #6
Rosso Corsa of corsa!!!
 
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Re: Erratic knocking noise

Quote Originally Posted by Norbiton View Post
Quick update to this post : I have determined that the knocking is getting worse !! However it stops when I press the clutch down. So I guess it isn't a suspension issue.
Looks like clutch or drive shaft ?
Release bearing?
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Old 18-11-2008   #7
Ban the Mongol rally
 
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Re: Erratic knocking noise

but should still be noisy with the engine running and stationary.
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Old 12-01-2009   #8
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Re: Erratic knocking noise

Thanks to all suggestions - It turned out to be a drive shaft bearing wearing out. Re con fitted by Fiat in Estepona and good a s new.

Thanks again
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Old 12-01-2009   #9
Rosso Corsa of corsa!!!
 
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Re: Erratic knocking noise

Good stuff!
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