7.3 eng runs rough then dies - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 8 (permalink) Old 02-09-2019, 03:55 PM Thread Starter
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7.3 eng runs rough then dies

late 99 SD with 225k miles, manual trans. Truck is well maintained, with minimal issues.
Driving yesteday just fine, them truck started to run real rough outta no where. pulled over, it eventually stalled, no restart. No CEL, Good fuel flow out of drain valve w/ key in run (tank 1/4 full), oil level good.
Put in new fuel filter, pulled chip, unhooked ICP sensor with no change. Truck seems to start if let set for 20+ min and will again run rough then stall, almost like not getting fuel? Its 20*F +/- here in SE MI, but ran fine on same fuel last week when it was -15*F. Not one to just throw parts at a vehicle, prefer to troubleshoot and diagnose properly. Any thoughts are much appreciated

-85 F350, 6.9, 4 speed, dually, dump
Soup bowl mod, Slightly turned up IP, 3-3.5 straight exhaust, manual GP, dual optima yellow tops, F450 solid front axle

-99 F350, 7.3, 6 speed, ext cab 6' bed, SRW
4" straight exhaust to 5" stack, cold air intake, turbo master, TS chip, XDP X wheel, AIH delete, Foil delete, 2" leveling kit
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post #2 of 8 (permalink) Old 02-09-2019, 04:08 PM Thread Starter
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Within past couple years ive replaced ICP and CPS. leaning towards bad IPR or insufficient fuel PSI? not sure or port to verify fuel psi?

-85 F350, 6.9, 4 speed, dually, dump
Soup bowl mod, Slightly turned up IP, 3-3.5 straight exhaust, manual GP, dual optima yellow tops, F450 solid front axle

-99 F350, 7.3, 6 speed, ext cab 6' bed, SRW
4" straight exhaust to 5" stack, cold air intake, turbo master, TS chip, XDP X wheel, AIH delete, Foil delete, 2" leveling kit
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post #3 of 8 (permalink) Old 02-09-2019, 05:32 PM
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If you were on a hill I would suspect a bad foot in the fuel tank. You could have clogged screens in the tank, or a fuel pump going bad. If you can put a pressure gauge on the fuel system and see what the pressure does as it starts to run rough that would help figure it out.
DENNY

1999 F350 AUTO 4x4 CC LB DRW 4.10
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post #4 of 8 (permalink) Old 02-09-2019, 09:17 PM
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Maybe a heat issue with the coil on the IPR, although that should throw a code.

Clogged in-tank screens like Denny suggested is a real possibility.

Check fuel pressure at the back of the filter housing. You'll need an SAE o-ring to pipe thread fitting.

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post #5 of 8 (permalink) Old 02-10-2019, 11:53 AM Thread Starter
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I will hook up pressure guage and see what i got. what kind of numbers am i looking for?
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post #6 of 8 (permalink) Old 02-10-2019, 04:41 PM
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Not sure if your stock or not, but put some fuel in it. 1/4 tank, and your mileage are good indicators your 1/4 tank bypass valve is stuck open or fallen off, meaning every time you hit a 1/4 tank it will suck in air. They usually go around your mileage.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
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post #7 of 8 (permalink) Old 02-10-2019, 05:21 PM Thread Starter
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Couldnt get the fittings i needed to plumb gauge into fuel bowl today. unhooked fuel line at pump outlet. turn key to run, pump runs but no fuel, just sounds like its sucking air. Guess im dropping the tank tomorrow. Thanks for the help and assistance, it appreciated

-85 F350, 6.9, 4 speed, dually, dump
Soup bowl mod, Slightly turned up IP, 3-3.5 straight exhaust, manual GP, dual optima yellow tops, F450 solid front axle

-99 F350, 7.3, 6 speed, ext cab 6' bed, SRW
4" straight exhaust to 5" stack, cold air intake, turbo master, TS chip, XDP X wheel, AIH delete, Foil delete, 2" leveling kit
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post #8 of 8 (permalink) Old 02-10-2019, 07:42 PM
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Or keep it above 1/4 tank until you want to do the job. I pull the box, its easier in my opinion.

2002 F350 Super Duty, Crew Cab,Long box,4x4, 7.3 PSD, Complete rebuild .010 over by myself except balancing, 2000hp billet connecting rods, ARP main and head studs, ceramic coated pistons, Smith Bros Chrome Molly push rods, Comp Cams springs, shims and seals. Competion complete valve set and head grinding and vacuum tested, Adrenaline HPOP, DP Tuner Infinity DX programmer and full load of tunes modified for my new Stage 3 250 shot injectors, ceramic coated exhaust manifolds and up pipes and collector, BD Diesel triple clutch furnace brazed billet torque converter and BD pro engine brake and compressor set up, MBRP 4" stainless turbo back, Driven Diesel regulated fuel return system, AFE pro stage 2 cool air intake, riffraff billet Whicked Wheel 2 compressor wheel in a GTP38R turbo, riffraff blue cooler boot kit and coil clamps, International Double Ceramic Coated Bellowed Up Pipes
1999 Mustang GT Convertible Anniversary, rare stock electric green
2009 40' Raptor Velocity Toy Hauler
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