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High Miler 7.3 low power, no codes

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Old 07-19-2011, 11:43 AM
stangclassic66 stangclassic66 is offline
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High Miler 7.3 low power, no codes

Hey All,

My F250 7.3 powerstroke is running a bit sluggish compared to my 7.3 excursion both in stock mode.

Low end power is weak and I'd like to get it remedied. Is there anyway I can diagnose this without an AE? Or do I absolutely need an AE to figure it out? If I do, is there anyone out in the SF Bay Area who can run I diagnosis for me? I'd gladly pay a fee if needed. I just don't want to go to a shop.

It's got 296k miles and cold starts are a bit long before it fires.

I had it chipped and it runs very strong in the performance and daily tunes with a wildman chip. As stated above, power doesn't build right away, but once it gets past 1900-2000 rpm the power builds normally.

Here's what i've done to it when I bought it.

Re-did up-pipe gaskets (restored quite a bit of power)
Installed known good turbo with wicked wheel
4" down pipe
4" exhaust exiting before rear wheel
reinforced intake plenum mod
6637 intake

I've got boost gauges and exhaust gauges and in stock i've seen the boost gauge up as high as 16psi. In a daily tune i've seen it as high as 25psi.

The exhaust temp i've never seen above 1000 degrees. But i've never really pushed it for long periods.

What do you think it could be with this many miles? Worn Injectors? Worn HPOP? Tired engine? I'd be hard pressed to believe the engine pistons/valves are worn?!

Thanks in advance guys.

2002 Excursion 7.3L 2wd
6637, WalkerBTM, DP (60hp econo, 100hp, 40hp tow), boost,egt,trans gauges
2003 F250 6.0L SOLD
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Old 07-19-2011, 01:15 PM
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kirkharrod kirkharrod is offline
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Start with the simplest possibility: boost leak.
2002 F-250 Super Cab, 300,000 miles!!!, 100,000 on WVO; Greasecar conversion, 20 plate heat exchanger, AIH delete-water injection in its place, DIY stock fuel bowl delete, beans Diesel fuel sump, 6637 air filter w/ Pete's cover, Straight Piped, GPR LED mod, CAT ELC, 203* thermostat, Bosch auxiliary coolant pump, ext coolant filter, fumoto oil drain valve, Aeroforce Interceptor scan gauge, ISSPro trans temp, boost, EGT, elec fuel pressure gauges, Cyberdyne coolant, veg oil, ambient air temp gauges, 80W low beams/100W high beams.
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Old 07-19-2011, 03:28 PM
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F-250 Super Duty F-250 Super Duty is offline
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F-250 Super Duty has a very good reputation on FTE.F-250 Super Duty has a very good reputation on FTE.F-250 Super Duty has a very good reputation on FTE.F-250 Super Duty has a very good reputation on FTE.
How long ago did you redo your up pipe gaskets? New donuts? Check them if your over 10,000 miles from replacement. How's the intercooler boots look? Oily? Have you tried tightening all the ic boots? Like stated before, start with the simplest and go from there.
'02, F-250, XLT, CC, 7.3PSD, 4X4, AFE-2, 4" Exh., BTS, 6.0L Trans Cooler, 6.0 IC, 1.00 Exh. Housing, Non EBPV Pedestal, Bellowed Up-Pipes, RR Boots & Inserts, AIH Delete, HPX, 3" Lift, Hutch & Harpoon, HID's, WVO Conversion, 238/100's, G2WW, 910 Springs, Pushrods, Gearhead Tunes, T500, Firestone Airbags
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Old 07-19-2011, 03:39 PM
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At your milage I would replace the LPOP, it's a quick cheap (under a hundred bucks) and should help with those long starts, and usually gives back a little power by suppling the HPOP with enough oil for full injection pressure, and it's a great way to spend a Saturday afternoon with a friend and a half- racker.
"I'm Jim and I'm a modaholic"PAA#111 '02 CC lariat, 4x4 6" 37x12.5 70R17 BAJA TA's, JW trans, 7.3, AFE intake, blade runner, AFE 5" exh., GTP38R non-wastegated, Beans stage II, Mahle ceramics, crower rods, 6.0 spearco CAC, Adrenaline HPOP, ceramic manifolds, TS Performance by BDP and yes, it's FAST!;'07 4x4 DRW CC Lariat moonroof & leather, 6", 6.0L PSD, 4" AFE, CAC & high ram, tuning by spartan, '07 Warrior 39 CR. '98 &'99 Expey's, custom rack by Dr. Fam
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