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Author: Subject: knocking noise help
smart51

posted on 11/7/14 at 08:38 PM Reply With Quote
knocking noise help

My RWD project car is making a knocking noise underneath. It's hard to say if it is the front or back. The noise is only quiet, only happens sometimes and only below about 15 MPH. I've replaced the propshaft and that made things a little better. I've inspected the rear diff mounts and suspension arms. They're fine. I can't feel anything through the gear lever or steering wheel. The noise stops when the brakes are on. What might it be and what should I try looking at next? Thanks.
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jwhatley

posted on 11/7/14 at 09:16 PM Reply With Quote
Sounds like backlash in the diff to me. Is it BEC or CEC?
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britishtrident

posted on 11/7/14 at 09:47 PM Reply With Quote
Strut suspension can give a low speed knocking noise if the struts are worn.





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smart51

posted on 11/7/14 at 10:32 PM Reply With Quote
I forgot to say that the frequency of the knock rises with road speed but is less than 1 knock per wheel rev.

The car has dual wishbone all round, so no Mc Pherson struts. I guess it's worth looking over the springs and dampers.

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19sac65

posted on 12/7/14 at 09:03 AM Reply With Quote
Tooth missing off the diff ?
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Angel Acevedo

posted on 12/7/14 at 12:51 PM Reply With Quote
How do you determine that is less than once per revolution?
No t trying to be thick, but have you checked wheel nuts properly tightened?
Best regards.
AA





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whitestu

posted on 12/7/14 at 05:47 PM Reply With Quote
Check your wheel nuts are tight.
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