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hi, i have a 1990 j plate t4 2.4. I have the most annoying droaning noise from in the cab. When sitting at idle and you rev it its present. The noise isnt present from under the bonnet. it is like a vibration being applified. I have replaced cylinder head, fuel pump, injectors, engine mounts both sides not the rubber one under neath. all parts are brand new from vw and the timing and valve timing is perfect. i have tried foam all round the engine etc. still no cure. all the exhaust mountings etc are ok. HELP!!!
 

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I'm no expert does the noise go away when you put the cluctch in ? I think it maybe releated to the brake vacum or possible clutch issue.

Hope you get it sorted !!
 

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Hi Mate. Have you checked the heat reflector plate above the exhaust downpipe. Mine had a similar prob to yours and it turned out to be that. The fixing screws rust out over time leaving it flapping about making all kinds of noises
 

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Same as above my plate was lose but made more of a tingle sound and very bad when driving
 
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