Quote:
Originally Posted by Yorkshire GOC
Sounds like you have a blocked plenum chamber - is the sound predominantly from the passenger side behind the dash/bulkhead - if so points to a blocked plenum. If your car is a diesel its important you get the chamber drained ASAP or your ECU will be damaged - not so critical for a petrol ECU as these are sealed and waterproof.
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The Plenums are dry, Its only when I blip the throttle, like it surging around the cooling system....