2000 7.3L turbo Air Noise - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 09-06-2010, 04:47 PM Thread Starter
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2000 7.3L turbo Air Noise

have a 2000 F 350 7.3L turbo powerstroke. Has 104K Miles. Under load pulling up a long hill when the trans drops down a gear
and rpm kicks up and throttle increases the turbo stahts to hiss then makes a sound like a high pitch bugle. Sounds like air horn like noise. when you
back off on throttle and loud air whine lowers until it stops. sounds like a air valve either not opening or closing all the way and trying to force thru it.
Any one have any ideas. The noise is deafening!
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post #2 of 12 Old 09-06-2010, 04:50 PM
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Wastegate.....
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post #3 of 12 Old 09-06-2010, 04:57 PM
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The wastegate on the turbo releases drive pressure (exhaust) at a certain point to prevent excess backpressure and excessive turbine speed. Crud can build and cause a higher pitch noise.
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post #4 of 12 Old 09-06-2010, 05:06 PM
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Does it blow black smoke? I've never heard the WG opened up before. I know it works.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #5 of 12 Old 09-06-2010, 05:24 PM Thread Starter
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Maybe the wastegate actuator is getting weak? no black smoke that I noticed. thx
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post #6 of 12 Old 09-06-2010, 05:27 PM
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Anything been done to the truck or is it stock?
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post #7 of 12 Old 09-06-2010, 05:30 PM Thread Starter
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It is stock. I bought it about 2 months ago and only drive it about 3 times per month pull three horse trailer with living quarters. Going up incline and under load and throttle open is when excessive noise horn sound happens. thx
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post #8 of 12 Old 09-06-2010, 09:23 PM
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Sounds like you have a loose clamp or a blown hose between the turbo, aftercooler, or intake, I would tighten all clamps and look for a torn hose.

Its the long skinny pedal on the right Cupcake
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post #9 of 12 Old 09-07-2010, 03:36 AM
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Quote:
Originally Posted by cowpuncher View Post
Sounds like you have a loose clamp or a blown hose between the turbo, aftercooler, or intake, I would tighten all clamps and look for a torn hose.
That's what I been thinking. Except it doesn't blow any black smoke so it's getting enough air. Must be a REALLY small hole.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #10 of 12 Old 09-07-2010, 05:26 AM
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A loose clamp wil make a high pitched noise and not much smoke and it only happening under load from the sounds of things so I gave him the cheap and first place to start point if that checks out then OP can post for more ideas. Good luck

Its the long skinny pedal on the right Cupcake
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