Okay here is the run down 2000 f250 7.3 bone stock other than k&n filter, straight piped, and boost gauge. Here is what it's doing, when it's cold at 1500 to 2000 rpms the boost gauge reads 10-13 psi as soon as I hit about 1600-1700 rpms the boost bleeds off and I get what I call a hollow sound in the exhaust similar to if you take a air hose stick it in a 5" peace of pipe and hit the air, sounds the same. now if I hit the gas it will jump back to 10-15 psi and the Turbo whistle comes back and runs fine till I drop back down to the 1500-2000 rpm range. When the trucks hot runs fine in all rpm range. I took the boost pressure hose off floored it and only made 23 psi. So what do you guys think the problem is. I was told new Turbo or rebuild it I have no clue. Please help thanks

 

It's not your turbo doing that. What you are hearing is the exhaust backpressure valve (EBPV) actuating. This is perfectly normal for cold weather operation, and is designed to activate until oil temps rise high enough.

The fact that the sound goes away when you hit the throttle means it's opening up as it should. If it didn't, it would indicate a plugged exhaust backpressure sensor.

So in all, don't worry about it. It's operating normally.

If you really are annoyed by the EBPV operation, you can easily disable it. Look underneath the very front of the turbo, at the front of the turbo pedestal (way down in the engine valley). There is an electrical connector on the front of the pedestal that controls the EBPV actuator rod. Unplug that connector, and the valve will remain open.

And 23 psi of max boost means you've got a chip or tuner. In stock form these trucks only max at 16-18 psi.

 

what Curtis said, all is well.....carry on.

 

See the truck has never made that sound before and its been -12 degrees and ran fine and its now in the 20's and its doing it. also when it makes that noise I have no power at all. And the truck has no tuner on it with the pressure line unhooked it should spike to 30psi and with it plugged in the truck should make 20-25 psi stock is what Midwest diesel told me. they do a lot of after market stuff, they said I may just need a new wasregate.

 

Curtis has you pointed in the right direction, sounds like normal EBPV operation to me too. Stock, I see about 18psi max, maybe a spike to 20 when it shifts. Chipped, I've seen around 25-26 max and 29-30 with the wastgate (red line) unhooked.

 

I just started hearing that same thing. Makes sense about the EBPV. It's been really cold the past two days.

 

The exhaust backpressure valve is standard equipment on these trucks. Here is a quick blurb about it's operation:

If you increase the load (roll into the throttle more) and it delays opening or doesn't open as it should, then you have a plugged tube leading to the exhaust backpressure sensor. That sensor helps to control the operation of the EBPV. If you suspect that the tube may be clogged with soot, here is a guide to clean it out:
Welcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page

They quoted you a load of BS. In bone stock form these trucks make 16-18 psi max. You can spike the boost 1-2 psi higher on a shift, and sometimes if you're lucky you can get it up to close to 20 psi sustained by pulling and plugging the red wastegate actuator line.

If you want 30 psi, you'll need a high hp chip. Even then, 30 psi on a stock turbo will kill it if you keep pushing it that high.

 

I have a bone stock 2002 F 350 . I have never had over 18-19 psi boost. I also have the same EBPV noise you have. others I know of have the same sound, and its normal. Your boost pressure will be different from day to day because of the barometric pressure, we are talking .5-1 psi

 

Welcome bo-tie etr, funny how a diesel shop can be wrong, seem's they want a handle on your truck so they can make some money. Now you have the correct information, stick around and learn from the people that drive and work on these trucks everyday..

 

I wanna thank you guys for all your help and I plane on sticking around for a long time you guys have helped out a lot. One more thing went to Napa today and for the 6637 filter they want almost $60 for it. And also can I get a link to where to buy the filter covers thanks

 

Riffraff Diesel: 6637

Here you go man, maybe this will help.

 

Clay posted ^^.He will get ya fixed up.Great guy/great service.He is a sponser here.Glad to have ya so hang around vwith us

 

A big X2, can't get any better than Clay's service and price.

 

i do not want to talk bad about a shop, i personally have never been in there or dealt with them, but i have worked on a few trucks that were towed to our shop after customers got tired of dealing with them. with that said there is alot of information to be learned on here and and great people always willing to help out. ask lots of questions and become your own judge. always good to see a member close by, hopefully when the weather warms up we can all get together.

 

Kccatpower where abouts are you located in kc