weird noise at idle? - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 10-03-2009, 01:01 PM Thread Starter
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weird noise at idle?

i had just started my truck and it was sitting idling in my driveway for a few min then out of no where it sounded like a loud constant whoosh of air coming from the exhaust. I have no cat or muffler just a straight pipe but i have never heard it do this. any ideas? i just installed a dp tuner yesterday and everything has been working fine. When i heard this noise i shut the truck off and restarted it and the sound was gone.
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post #2 of 2 Old 10-03-2009, 01:20 PM

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Its your exhaust back pressure valve. Its a butterfly valve right after the turbo outlet that closes when cold to quicken warmup times.

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2000 F-250, forged rods, 38r turbo, BTS trans, TW tuning and Bad Night Special 50 horse Caterpillar injectors

2002 F-350, remote engine mod

Originally Posted by alberta 7.3 View Post
Yeah, I'd probably feel a bit drained after firing twice in rapid succession.
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