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760 B280F 'knocking' 700 1989

posted by  89_760_driver on  Thu Apr 29 17:35 CST 2004
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last visit: Wed Feb 18 21:40 CST 2009
[RELATED]

Hi again,

Another annoying thing with the car is an unven knocking sound that occurs when warm and idling in drive. It sounds a bit loke someone knocking on a desk. It is loud enough to be annoying. I have checked the exhaust shields and all seem ok. it appears to be coming from somewhere around the left rear of the engine. The sound does not happen when idling in park, or while driving. I have tried using a hose to listen, but cannot isolate the sound exactly. What could this possibly be?

Thanks again,

Tim, Australia.








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    760 B280F 'knocking' 700 1989

    posted by  someone claiming to be rollei35guy on  Thu Apr 29 22:46 CST 2004 [RELATED]

    I'm not sure but I have a knocking sound in my 760/B280F. It occurs in drive at idle. I am pretty sure mine comes from the vacuum pump. That would be in the right front of the engine though. It goes away eventually.

    Carter








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      760 B280F 'knocking' 700 1989

      posted by  89_760_driver on  Fri Apr 30 05:51 CST 2004
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      last visit: Wed Feb 18 21:40 CST 2009
      [RELATED]

      Thanks for the reply. I'm fairly certain it isn't what you describe, as I don't think this engine has a vacuum pump, although the symptoms sound the same. I'll have to look and listen closer. It appears the B28 has a vacuum pump in the location I'm describing, but my version of the B280F does not. When I first heard the sound it appeared to be coming from around the bellhousing, so at the moment it's a mystery.

      Thanks again, Tim







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