93.5 7.3 Turbo defueling after getting to temperature

So I bought a 93.5 F250 with a 7.3 turbo IDI a few months ago. Up until recently, it's been running smooth as butter, save for the two times I ran it out of fuel. As of recently, when I get the truck to temperature, it starts blowing huge clouds of blue smoke (and occasionally white, especially if it's been running for a while and I've been traveling constantly at high RPM like on the highway), has little power, and make a horrendous rattling/gnashing noise, when either my foot is halfway to the floor or it's revved past 2,000RPM, sometimes as low as 1,500RPM. I have a hunch it's either the injectors or the fuel pump but I'd like to be sure before I replace either (eventually both will be replaced, but I need to know which needs to be done asap). Does anybody have any ideas as to what could be causing this?

EDIT: It starts just fine hot or cold. No excessive cranking. And it idles perfectly fine, no smoke out the tailpipe. It's only when the engine is revved or the go pedal is pushed halfway to the floor after it's been running and driving for a good 15-20 minutes.

EDIT2: During some of the longer drives I've made recently, when keeping the engine at 1,500rpm and above for over 30 minutes or so, it shakes and shudders like there's a misfire, but if I back off the throttle, it'll go back to purring like a kitten.

Exhaust back pressure valve.
Disable it/tie it open.

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Do you know much history on the truck/parts replaced on it? I believe some 7.3s that were in equipment had a very low governor spring, I wonder if someone pulled an ip off one of those and dropped it in the truck

Huh. When I first read this, I read 94.5 or something. As in a powerstroke. Lol
Pic of engine? (Just to be sure)

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79jasper said:

Huh. When I first read this, I read 94.5 or something. As in a powerstroke. Lol
Pic of engine? (Just to be sure)

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I just figured your mind was still in the psd forum

Welcome to OBN,Bear.A mid year build '93 is just considered a '93.
The reason the '94 year is split,is because the powerstroke was introduced mid year in '94 and helps people know which engine they have.

Sounds like you have at least some sticking injectors and the IP probably on it's last legs too.They're medium ware items on the IDI and should be replaced every 100-150k miles.
Call up CDI and Mel can help you,get the old gal running like she should,again.
Conestoga Diesel Injection

Thewespaul said:

I just figured your mind was still in the psd forum

Click to expand...

The symptoms were a exact fit too. Lol

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79jasper said:

Huh. When I first read this, I read 94.5 or something. As in a powerstroke. Lol
Pic of engine? (Just to be sure)

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Click to expand...

It's definitely an IDI.

Thewespaul said:

Do you know much history on the truck/parts replaced on it? I believe some 7.3s that were in equipment had a very low governor spring, I wonder if someone pulled an ip off one of those and dropped it in the truck

Click to expand...

I have no maintenance history on the truck. Only thing I know for certain is that it sat for a considerable amount of time before I purchased it. The governor spring wouldn't make sense though, as I've taken it out to 3,000-3,300rpm before it started running poor.

FORDF250HDXLT said:

Welcome to OBN,Bear.A mid year build '93 is just considered a '93.
The reason the '94 year is split,is because the powerstroke was introduced mid year in '94 and helps people know which engine they have.

Sounds like you have at least some sticking injectors and the IP probably on it's last legs too.They're medium ware items on the IDI and should be replaced every 100-150k miles.
Call up CDI and Mel can help you,get the old gal running like she should,again.
Conestoga Diesel Injection

Click to expand...

Gotcha, I was told it was a 93.5 because that's when they introduced the factory turbo (or something like that). Conestoga's parts I know are some of the best in the business, but I'm a student with limited funds and those parts are out of my price range. Is there a place I can get a quality rebuilt pump for less? Or if anybody knows of a diesel shop around central florida/ Brevard County that does rebuilds of the DB2's...

79jasper said:

The symptoms were a exact fit too. Lol

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Click to expand...

Was seriously scratching my head on that one

I don't remember ther price comparison between r and d and conestoga but they also have pumps, cheap usually means poor quality maybe possible someone on here has a spare pump that works they could sell you? I know about low funds and my credit card is still being paid off now I just consider it a truck payment since my trucks been paid off since day one. But quality is worth the price, buy two cheap pumps because one failed and you could have bought one good one that won't fail

Have you tried a fuel filter, sounds like it might be starving for fuel under a load.

I have a spare pump for sale for $150

Either of the two big names in quality pump rebuilding right now are actually very competitive in price on their stock rebuild levels to a junky parts house reman unit.

If you don't go used but known good, it doesn't make any sense not to buy from one of those two really.

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Thank you all for helping me with this issue. For all others with a similar issue, I suggest you check your boost elbows when the engine is at temperature. The issue turned out to be a combination of my air filter being clogged with oil (lift pump failed and covered it in oily mist) which was restricting air flow and the elbow connecting my bhaf to the turbo inlet had failed and would warp when the engine bay got to operating temperature. When the elbow warped, it would cover the turbo inlet and starve the engine of fuel, the blue smoke I saw was it sucking oil through the CDR delete hose.