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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Knocking noise - road speed relatedViews : 1148 Replies : 15Users Viewing This Thread : |
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Apr 16th, 2018, 13:29 | #1 |
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Knocking noise - road speed related
Fix one problem and another appears.....
One the 'new' V70, it's just started developing a knocking noise that's road speed related and only audible below 40ish mph. Clutch in/out makes no difference. I've checked the hub bolts, both are tight. Can't seem to replicate it in the drive on axle stands. I've noticed there is more lateral movement in the offside drive shaft than on the car I'm selling, could this be a clue? Any suggestions on next port of call? Could a CV joint knock under normal driving, rather than on tight turns? Assume that after fixing the engine problems, it's now developing power/torque as it should and has stressed something on the transmission. Car is an '03 V70 D5 (manual) with 202k on it. |
Apr 16th, 2018, 15:29 | #2 |
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Hi,
Two things I would check; First check for a stone or nail in the tyre. Next the ABS wheel sensor might be just clipping the toothed ring on the drive shaft. Good luck. bob
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V70, 140BHP 2002 AUTO. XC60 2015 AUTO |
Apr 16th, 2018, 15:47 | #3 |
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Might sound silly but I had that problem before and there was a stone stuck in the tyre thread.
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Apr 16th, 2018, 16:55 | #4 |
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If no stone is found....check your drop link....
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Apr 16th, 2018, 17:12 | #5 |
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and it's now refusing to do it, although only been round the block today. Hoping it was something silly that has cleared itself - time will tell.
Have noticed a slight knock (unrelated) coming on/off throttle, guessing a mount or 3 will be in need of inspecting. Was a definite and heavy knock that you could almost feel on the car floor - Hmm, scratches head! Last edited by reggit; Apr 16th, 2018 at 17:19. |
Apr 16th, 2018, 18:25 | #6 | |
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Quote:
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Apr 16th, 2018, 18:51 | #7 |
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HAHA - sounds familiar, been hunting a suspension knock for ages at the back of the old V70 (the one I'm selling), finally found it - the exhaust heat shield had a broken fastening and was knocking on the back box on bumpy roads - which is all the roads round here! May be worth checking on yours
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Apr 22nd, 2018, 06:50 | #8 |
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Just a bit of an update;
Found a bit of time to get under the car and have a good inspect of everything. All the ball joints seem good from the best I can lever things with a big screwdriver. Founf that there is quite a lot of lash in the driver side (RHD) driveshaft and I can definitely hear a metal on metal clunk from the outer CV joint at certain positions. Have ordered a new (used) driveshaft to see what that does to alleviate the issue. |
Apr 22nd, 2018, 12:36 | #9 |
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I'm a little bit thinking engine (or due to the engine mounts). Hopefully not some knocking due to a loose cam belt or a problem with the pulleys on the serpentine belt. Maybe give these a check (if the cam belt was replaced by someone else, I'd make sure he used quality parts)
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Apr 22nd, 2018, 13:21 | #10 |
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Its road speed, not engine speed related. Can dip the clutch and the noise continues at the same frequency. The only play I can find is in the driveshaft. Time will tell I guess.
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