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D5 warbling accelerator

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Old 04-02-2008, 10:38 AM
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Join Date: Apr 2008
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Default D5 warbling accelerator

2003 s80 D5 strange warbling sound when throttle depressed, more throttle higher the noice. almost like a pressure valve. only does it when under load, ie. selecting higher gear a bit early. stops when revs reach normal for that gear. thought about changing fuel filter as car has done 102k. any help most gratefully received.
 
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