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Diagnosis Please


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Friends TDi has started making a funny noise....

It occurs rythmicaly with the engine revs, can be heard through the air intake. Sounds like a popping noise or as if you were knocking a stick against a wooden / bamboo tube in time with the engine.

(Removal of the air filter makes it quite loud.)

He believes engine performance may be down but not driven far since the noise started.

Any suggestions ?

Anything to check ?

Thanks in advance

Neil

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