7.3 powerstroke help!!

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7.3 powerstroke help!!

Post  gmsmkr on November 16th 2015, 12:48 am

My 99 f350 just recently started making a hissing sound under part throttle it goes away when I give it throttle and let completely off. Driving it down the road it sounds like it's coming from the dash... what could it be. Thanks for any help on this
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Re: 7.3 powerstroke help!!

Post  69F100 on November 16th 2015, 5:59 am

vacuum leak does your heat/ac controls work right
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Re: 7.3 powerstroke help!!

Post  richter69 on November 16th 2015, 9:26 am

Exhaust backpressure valve, normal in cooler weather. Mine has been deleted
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Re: 7.3 powerstroke help!!

Post  gmsmkr on November 16th 2015, 9:44 am

69F100 wrote:vacuum leak does your heat/ac controls work right
All the controls are working great as they should

richter69 wrote:Exhaust backpressure valve, normal in cooler weather. Mine has been deleted
I thought about the EBPV when I first heard it but even when the truck was up to temp it still made the noise only at around 1500-1700 rpm holding it consistent.

How do I delete the EBPV and will it hurt anything
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Re: 7.3 powerstroke help!!

Post  richter69 on November 16th 2015, 9:49 am

As long as the outside temps are cold it will still do it, unplug it to verify
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Re: 7.3 powerstroke help!!

Post  gmsmkr on November 16th 2015, 9:52 am

richter69 wrote:As long as the outside temps are cold it will still do it, unplug it to verify

Ok thanks I will do that this evening
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Re: 7.3 powerstroke help!!

Post  jbozzelle on November 16th 2015, 2:35 pm

Or the EBPV sensor tube from the exhaust manifold to the sensor could be clogged too. Fabio would know for sure. I know I had to clean mine once before because it was causing problems.

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Re: 7.3 powerstroke help!!

Post  BigRigTech on November 16th 2015, 2:52 pm

Delete it. Its a pain in the ass when it seizes closed at some point..LOL....I would check the up pipes too, they can his if they are leaking at the turbo collector.
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Re: 7.3 powerstroke help!!

Post  gmsmkr on November 16th 2015, 5:57 pm

Well I think found the problem the small tube has rust holes in it
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Re: 7.3 powerstroke help!!

Post  Bill Heard on November 19th 2015, 3:32 pm

How do you delete the EBPV ???
My truck started nocking going up big hill towing trailer. Runs fine around town and no hills.
I just took off the cat. converter, it was not plugged, you could see through it.
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