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nock-nock noise in the engine 900

The car is a 1993 940 with a Regina fuel injection. I can hear a nock-nock-nock noise in the engine. Not very loud and only when the engine is warm at normal temperature. Any suggestion? Thanks






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New nock-nock noise in the engine [900]
posted by  carlosh-r  on Mon Feb 2 07:58 CST 2009 >


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