How de-tuned was a 460 U-Haul box truck? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 12-06-2017, 11:35 AM   #1 (permalink)
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How de-tuned was a 460 U-Haul box truck?

I recently picked up a 1997 F350 retired U-Haul box truck. I am curious to know if these things were detuned on purpose, Or if thing really does not have any power. Eventual plan is to make a RV/tow rig.
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Old 12-06-2017, 12:35 PM   #2 (permalink)
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Have you checked out all the vitals: plugs, compression, vacuum...? U-hauls tend to have a rough life... The one's I've run in the past with the 460 never seemed to be short on power, but I wouldn't call them race trucks either... And they had that annoying "economy meter" gauge that always felt like a tattletale if you romped the crap out of them too much.
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Old 12-06-2017, 01:36 PM   #3 (permalink)
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I don't know if they are detuned but with other companies, I know they set the cruise and max road speed at 70. When the truck is sold they do away with that. My bet is it was used hard and put away wet. Uhaul doesn't maintain their shit very good and it stays in their fleet for almost 10 years before they replace them.
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Old 12-06-2017, 05:42 PM   #4 (permalink)
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I've always found fuellie 460's to be guttless wonders compared to a carbed engine.
The numbers say different but my 86 always felt much stronger than any of the fuellie rigs I have driven.
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Old 12-07-2017, 07:43 AM   #5 (permalink)
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could be a mass air motor if its a 97', so upgrades are actually pretty easy compared to the speed density stuff.
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Old 12-07-2017, 08:25 AM   #6 (permalink)
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could be a mass air motor if its a 97', so upgrades are actually pretty easy compared to the speed density stuff.
Only if it's Cali spec. Rare but much nicer to work with
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Old 12-07-2017, 08:55 AM   #7 (permalink)
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Quote:
Originally Posted by 82F100SWB View Post
I've always found fuellie 460's to be guttless wonders compared to a carbed engine.
The numbers say different but my 86 always felt much stronger than any of the fuellie rigs I have driven.
This.
All the ones I have owned were dogs. I'd guess once U-haul puts 2k worth of box on it and it get beaten, it's even worse.
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Old 12-07-2017, 09:33 AM   #8 (permalink)
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Quote:
Originally Posted by 93_Fummins View Post
Have you checked out all the vitals: plugs, compression, vacuum...? U-hauls tend to have a rough life... The one's I've run in the past with the 460 never seemed to be short on power, but I wouldn't call them race trucks either... And they had that annoying "economy meter" gauge that always felt like a tattletale if you romped the crap out of them too much.
I have not dug too deep into this yet. It has a bunch of other codes indicating a lean condition Iíve got to iron out before I say this thing is truly gutless. I just donít have a baseline to work off of, never drove a fuelie 460 aside from an old wrecker with 300k on it.
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Quote:
Originally Posted by mustange70 View Post
could be a mass air motor if its a 97', so upgrades are actually pretty easy compared to the speed density stuff.
Only if it's Cali spec. Rare but much nicer to work with
California truck, with Mass air.

P1744
P0443
P0174
P1131
P1151
P0171

Replaced the EGR valve( was letting un-metered air into the engine), checked the fuel pressure. When the truck falls in itís face, the pressure rises. It will backfire through intake and stumble before itís fully warmed up. Afterwards it drives ok unless you get into it, then it gets louder, downshifts, then slows down until I let off of it. Could be half a dozen things wrong, donít want to throw money at it that I donít need to.
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