03' 7.3 10psi max boost? New turbo - Ford Powerstroke Diesel Forum
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Old 11-01-2013, 01:42 AM
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03' 7.3 10psi max boost? New turbo

Hey guys, this is my first post but I've been lurking around for a few months

I have a 2003 F-450 with a 7.3L, truck has hardly any guts, just a pig really... I took it to a mechanic and he told me the turbo was bad, I paid to have the turbo replaced and still only getting 10psi of boost (same as before the new turbo) so i did a boost pressure test of the system, no leaks. Replaced the ICP sensor, Air filter, tried disconnecting the wastegate line, replaced the #8 injector (failed test on scan tool) and no dice so far. No cat on the truck....WG seems strong but I haven't wired it shut yet...

I have a new set of up pipes coming, in case a leak is causing this? (but I don't hear any leaks).

I'm reading the boost using a ford scan tool (rotunda with ford SW)

Any ideas what might cause such low boost?
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Old 11-01-2013, 06:42 AM
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same boat your in...tryn to find my lost pressure for 2yrs.

Try unplugging the redline at wastegate and see what happens. I'm thinking mines' at either the plenums or the collector, but doesnt show soot stains.
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Old 11-01-2013, 08:01 AM
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Up pipes can cause a huge loss in boost and power. You can usually see soot around them if theyre leaking. If you replace them i would suggest doing the International bellowed pipes. Could also be your intercooler. I'd pull it and pressure test it. the plastic is known to crack expecially in the Cold
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Old 11-01-2013, 12:42 PM
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do yourself a favor and buy a boost leak detector from dieselsite.

that way you can hear all your leaks (you could have a few) and be sure where its leaking from.
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Old 11-01-2013, 09:47 PM
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why buy a boost leak detector. Go to Home Depot andbuild one yourself for 5 buks.
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Old 11-02-2013, 05:49 AM
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Have you replaced your fuel filters? What's your fuel pressure?
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Old 11-04-2013, 09:25 PM
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I love how over half of the people who replied did even read my post, yeah check for boost leaks, I ALREADY DID, ARE YOU BLIND? LOL...

So it ended up being several issues, the up pipes were leaking bad and I didn't even notice it but now they're replaced it's so much quieter, that was the boost issue but it didn't solve the issue at first because the vaccum line was on the wrong side of the 3 way bleed valve (follow the red line on the WG to the bleed valve)...

So even if you don't think your up pipes are leaking, they probably are!!
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Old 11-04-2013, 11:41 PM
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up pipes leaking is a boost leak

up pipes are a easy diagnosis
whether its soot on the firewall or exhaust fumes/smoke coming from under the hood.

hope you got it fixed.
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Old 11-05-2013, 04:29 AM
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Quote:
Originally Posted by blue99stroker View Post
:
up pipes leaking is a boost leak

up pipes are a easy diagnosis
whether its soot on the firewall or exhaust fumes/smoke coming from under the hood.

hope you got it fixed.
up pipes leaking, is "exhaust" leak :

OP, i think that may be my problem as well...no soot or smoke anywhere ,but think, there leaking....have them dormans' on the bench for a while now
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Old 11-05-2013, 01:10 PM
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i didnt have any noticable exhaust leak, noise, soot, etc once the turbo was out you could see some minor soot on the up pipes though. once i changed them the engine was much quieter, so i could hear it but didnt realize it was leaking ... whoever said an exhaust leak is a boost leak is retarded....
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