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wierd hissing noise
my 2001 excursion make a wierd hissing sound from the engine compartment while under load. can't get it to do it unless I have the trailer hooked up and I'm towing. the more the load the louder the noise. not a whistle, and goes away as soon as I let off the throttle. any ideas where to start? Could it be a boost leak at turbo, if so what are the likely suspects?
thanks for any help
john
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Linear Mode
