still low boost after boot leaks fixed - Ford Powerstroke Diesel Forum
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Old 05-17-2014, 10:26 AM
Zen Zen is offline
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still low boost after boot leaks fixed

ok, I did a boost leak test and fixed all the leaking boots. I still am only getting 17 at WOT with the red tube disconnected and plugged. I don't see any dusting from up pipes, but honestly don't know exactly what dusting looks like.
What are other sources of low boost other than
boots
turbo wheel
up pipes?

Waste gate seems tight, although I guess I could wire it shut as a test

I don't want to pull the turbo just to inspect it and don't want to throw up pipe parts at it right now if I don't need to.

Boost did go up a couple of PSI after fixing boot leaks.

Or is 17 normal? I thought 20-25 especially with red tube mod.

Thanks
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Old 05-17-2014, 12:11 PM
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tuned or stock? up pipes will have soot streaks more than likely where they connect to back of turbo. the firewalls may also have some soot on them too. leaking manifolds is another source of boost lost. how many miles are on your truck?
http://i117.photobucket.com/albums/o...haust_Leak.jpg

that's what it will typically look like.
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Old 05-18-2014, 05:19 AM
Zen Zen is offline
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Only mods red tube egrv disconnected, straight pipe.
215k miles

Will look for streaks today

Would the up pipes up during a boost leak test?
Are you talking exhaust manifolds or intake manifolds?

Thanks

Last edited by Zen; 05-18-2014 at 05:37 AM.
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Old 05-18-2014, 06:24 AM
Zen Zen is offline
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Drivers side up pipe is definitely leaking so time to order parts. Could a leaking up pipe make a ticking sound like an exhaust leak as well? Any other mods I should do while I have the up pipes out or things I should check?

Thanks
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Old 05-18-2014, 10:32 AM
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You mean red tube for wastegate. You don't have an EGR on a 7.3. Up pipes wont show up on boost leak test. Exhaust manifolds NOT intake. Resurfacing them and using new gasket and bolts will fix them if they're leaking.

A leaking up pipe will make a ticking sound like an exhaust leak because it is an exhaust leak. Replace them with international bellowed up pipes. I got mine from Riff Raff Diesel. Go ahead and order the turbo pedestal orings (upper and lower) since you'll have the turbo off. If you want to now would be the perfect time to delete the EBPV and either mod your current pedestal or order the non EBPV pedestal for 115 bucks. I wish I had done this when I did up pipes. If you want to keep the EBPV order the EBPV pedestal rebuild kit. Pedestal orings and EBPV are two very common places for oil leaks on 7.3's.
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Old 05-25-2014, 04:12 PM
Zen Zen is offline
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ok, up pipes replaced and EBPV deleted. Still only getting about 18 of boost pulling a trailer at WOT. Since the EBPV has been deleted do I need to worry about the EBP sensor and tube as far as creating a lower boost condition? Any other thoughts? How do I test the waste gate?

Thanks
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Old 05-26-2014, 07:41 AM
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EBPV delete wont affect the EBP sensor and tube, just make sure the tube is free from soot obstruction and the sensor isn't plugged with soot. You could wire the wastegate shut to be sure it isn't opening. What I would do though is hook your red line back up to wastegate and see what kind of boost you're getting. 15-17 on stock is normal.

EDIT: How's the turbo wheel look?
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Old 05-26-2014, 09:05 AM
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turbo wheel looked good on both sides with no play.
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Old 05-27-2014, 04:46 PM
Zen Zen is offline
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ok the EBP tube and sensor were totally plugged and the tube was broken. Boost is now up to 19max at wot. I can't test putting the red tube back on as the vacuum boot disintegrated when I took it off. Would bad vacuum seals around the red and green tubes cause any issues? they are all shot and need to be replaced. Anybody have a part number for the rubber boots?
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Old 05-27-2014, 05:47 PM
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Did you put a cap on the red line since the boot dry rotted? I believe the green line that runs to the intake tubing is just the excessive boost pressure that is bled off by the wastegate. So it won't affect boost. However the red lines are pressurized anytime you're making boost so dry rotted boots could have an effect on boost pressures. Sorry, I have no idea on the part numbers though.
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