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1994.5 - 1997 7.3L Power Stroke Diesel  

No power while towing.

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Old Apr 12, 2023 | 11:35 AM
  #16  
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Plenums can and do leak with age also. BTDT. Dump the OBOD quick.

I would check fuel pressure under load and gut the cat. Stock muffler is not a restriction at modest power levels. Consider efuel on the truck not only for more power but superior filtration.

Exhaust manifolds can leak (driver rear) and 220k you probably have leaking uppipes to an extent.
 
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Old Apr 12, 2023 | 12:01 PM
  #17  
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Originally Posted by knottyrope
Awesome! I'll post on some of my results as soon as I get everything squared away..

 
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Old Apr 12, 2023 | 01:48 PM
  #18  
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Originally Posted by Hit Man X
Plenums can and do leak with age also. BTDT. Dump the OBOD quick.

I would check fuel pressure under load and gut the cat. Stock muffler is not a restriction at modest power levels. Consider efuel on the truck not only for more power but superior filtration.

Exhaust manifolds can leak (driver rear) and 220k you probably have leaking uppipes to an extent.
Fuel pressure at idle is 60-75.

Driving at WOT it fluctuates from 14-75.

Getting stuff now to check boost leak.

Didn't see much of anything in that port, stuck a pick in there and didn't get anything out..

 
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Old Apr 12, 2023 | 01:57 PM
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14 to 75
i hope the average is more like 40 or that could mean pump or its supply could be impeded

 
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Old Apr 12, 2023 | 05:01 PM
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Originally Posted by knottyrope
14 to 75
i hope the average is more like 40 or that could mean pump or its supply could be impeded
Found a leak, the hose going to the MAP sensor was completely split, not sure how much that would effect anything?

I pressurized the exhaust also and didn't see any leaks from up pipes.

Truck appears to be fine.

Hooked back up to the trailer and attempted the route again, it definitely felt better, but I think my expectations were just higher than reality.. this is my first diesel, so my only towing experience is with my 95 with 460.

It's super windy today and had a head wind about 30mph and I was able to get to 65 with some better shift timing and getting the RPMs higher.

Fuel pressure was fairly stable on the pull, if I had to guess the average was 40s-50s.

I'll try again once this storm blows through and give it a real go.

 
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Old Apr 12, 2023 | 05:42 PM
  #21  
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You checked uppipes where?

When I was new to these I thought they leaked at the manifold. Nope. They do at turbo collector.

Busted MAP line makes you go slow.

What tune are you running with that TS6?
 
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Old Apr 12, 2023 | 05:55 PM
  #22  
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Originally Posted by Hit Man X
You checked uppipes where?

When I was new to these I thought they leaked at the manifold. Nope. They do at turbo collector.

Busted MAP line makes you go slow.

What tune are you running with that TS6?
I made a cap for my tail pipe and pressurized it with air, I sprayed soapy water at every joint in exhaust system before the cat and around the turbo.

Normal driving I'm on 75, towing I'm on 50.



 
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Old Apr 12, 2023 | 06:24 PM
  #23  
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Where are you getting your boost numbers from? It seems like if the MAP sensor line was cracked it would be impossible to pull 20lbs of boost. Unless its hooked up somewhere else.
 
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Old Apr 12, 2023 | 06:34 PM
  #24  
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Originally Posted by 96SD
Where are you getting your boost numbers from? It seems like if the MAP sensor line was cracked it would be impossible to pull 20lbs of boost. Unless its hooked up somewhere else.
I have it TEED into that line, I was thinking the same the same thing, but I've hit 20lbs.. It takes a long on ramp to get there, but it will eventually get there.. and even then, it just kisses 20lb

It's usually 2-3 cruising, and gets up to 10ish unloaded just cruising up hills.

The split was about a few inches before my T point.

Maybe not big enough to cause issues unless prolonged boost?
 
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Old Apr 12, 2023 | 09:26 PM
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Remove the kitty, I had a 6.0 cat that I installed a few years back and it was clogging and truck felt sluggish along with high EGT's, no crunk juice on WOT. Took it off problem solved had it so long that I had forgotten how fun my truck was empty and towing.

​​​​​​
 
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Old Apr 15, 2023 | 11:46 AM
  #26  
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Originally Posted by 96SD
Was just posting that. I use obd2 reader on my 1996 with no issues. l do select J1850PWM. Works great.
What are the common things watched on this? And what value should I expect to see?

I've selected battery voltage, HPOP, ICP so far.
 
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Old Apr 15, 2023 | 11:55 AM
  #27  
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Check HPOP duty cycle, IPR I think it is under. My old, beat pump did about 550psi hot idle at 15% or something. New Adrenaline is around 8-9%.

Maintaining rail pressure gives you power via fuel atomization.

I check uppipes on cold start. Hood open and no glow time. That way smokes pretty good. They leak at turbo collector. Check quick so will not burn yourself.

Unbolting cat from downpipe is easy to do.
 
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