7.3l blow off valve?? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 01-03-2008, 07:17 PM Thread Starter
 
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7.3l blow off valve??

Ive got a 00' f250 7.3l and for about the last week here my truck wont build any boost until i get down the road for about 5-8 minutes. it sounds like air is just blowing in the engine compartment. could this be my blow off valve sticking?
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post #2 of 5 (permalink) Old 01-03-2008, 07:20 PM
JUCK FEEP
 
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Sounds like the choke, mine sounds like a jet for the first 5 min if it's cold enough out side.


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post #3 of 5 (permalink) Old 01-03-2008, 07:33 PM
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Choke is not the correct word or concept at all. "choke" is a butterfly valve in the intake a carb'ed gas engine that closes to pull in more fuel during a cold start. Try again.

Anyway, what you're describing sounds very much like your Exhaust Back Pressure Valve, or EBPV. It's a hydraulically actuated butterfly valve in your exhuast that your engine closes to raise backpressure to help the engine warm up in cold weather. Yours sounds like it may be sticking, as mine will usually open right up when I press the accelerator, and close back when I'm at even throttle, coasting, or idling. The actuator rod gets all gunked up and even leaks sometimes. A lot of people just delete the whole thing if they've got the turbo out.

If you do a title search on EBPV, you'll get enough hits to keep you busy for days.

Good luck,
Paul

edit: BTW, we dont have a blowoff valve. They're needed for turbo'd gas engines to allow boost to escape when the throttle plate closes...and we ain't got no stinkin throttle plates.

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post #4 of 5 (permalink) Old 01-03-2008, 07:52 PM
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Quote:
Originally Posted by paulkeith
Choke is not the correct word or concept at all. "choke" is a butterfly valve in the intake a carb'ed gas engine that closes to pull in more fuel during a cold start. Try again.

Anyway, what you're describing sounds very much like your Exhaust Back Pressure Valve, or EBPV. It's a hydraulically actuated butterfly valve in your exhuast that your engine closes to raise backpressure to help the engine warm up in cold weather.
my bad :bow:


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99.5 Audi A4 1.8T Quattro Sport pkg 5spd GT2871R FMIC MBC 22psi 3" intake 19x8.5's JL Audio system and more.....

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post #5 of 5 (permalink) Old 01-03-2008, 08:16 PM
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If the guy knew what a choke was, and you called it a choke, he'd be sent in the 100% wrong direction, looking for problems in the intake rather than exhaust. Not trying to bust you up...just use the right words. Attention to detail is key, and wrong advice is worse than no advise. Anyway, I dont want to start a pissing match in this guy's thread. End hijack.
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