Work truck has a miss... - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 07-01-2009, 08:24 PM Thread Starter
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Work truck has a miss...

Truck here at work has a miss while its running under a load. Isn't noticeable at idle they say. Truck is a 1997 7.3 with 260K miles on it. Oil is full, new fuel filter, and they just replaced the $1000 computer because thats what they thought it was before I got involved. Any thoughts on what it could be?

Zach
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post #2 of 10 (permalink) Old 07-01-2009, 09:22 PM Thread Starter
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And yes, we tried the CPS.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, X Code Springs, 33" BFGs (SUCK), Alpine W200, Pioneer "D" Series Kevlar 6x8"s, Sirius Satellite Radio, 12" Memphis Pro Audio Subwoofer.
20x10 Mickey Thompson Classic IIs, waiting on tires


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post #3 of 10 (permalink) Old 07-02-2009, 12:26 AM
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It is probably a bad injector.

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post #4 of 10 (permalink) Old 07-02-2009, 02:21 AM
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SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
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post #5 of 10 (permalink) Old 07-02-2009, 03:20 AM Thread Starter
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Let me add... it isn't noticeable in park, but once you put it in gear the whole truck starts to shake.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, X Code Springs, 33" BFGs (SUCK), Alpine W200, Pioneer "D" Series Kevlar 6x8"s, Sirius Satellite Radio, 12" Memphis Pro Audio Subwoofer.
20x10 Mickey Thompson Classic IIs, waiting on tires


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post #6 of 10 (permalink) Old 07-02-2009, 03:37 AM
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If a shop put it on a scanner, ask for the codes they pulled.

If it's under any load (as in when placed in gear), then it sounds transmission related.

If it's when accelerating that's a whole 'nuther story.

$1K for a computer? I'd steer clear of that shop.

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post #7 of 10 (permalink) Old 07-02-2009, 03:41 AM Thread Starter
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This is the maintenance shop at my work... They are good with gas motors, not diesel. The miss is there all the time, but isn't noticeable at speed. $1K is what they paid for the computer from a parts source, I believe. Brand new, not used. It's not throwing any codes that their basic scanner can pick up. I tried explaining to them that there are codes that it won't throw, but they didn't get it.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, X Code Springs, 33" BFGs (SUCK), Alpine W200, Pioneer "D" Series Kevlar 6x8"s, Sirius Satellite Radio, 12" Memphis Pro Audio Subwoofer.
20x10 Mickey Thompson Classic IIs, waiting on tires


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post #8 of 10 (permalink) Old 07-02-2009, 04:24 PM
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You can have a bad injector w/ no codes. You need to have someone perform a buzz test. They could try checking the manifolds with a heat gun, maybe find a cold cylinder.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #9 of 10 (permalink) Old 07-02-2009, 04:27 PM
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You could also pull the valve covers and unplug the injectors one at a time and see which one makes no difference when unplugged. Probably not recommended but would work, kinda like doing a cylinder cut out test.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #10 of 10 (permalink) Old 07-02-2009, 04:44 PM Thread Starter
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Did a buzz test this morning, came back cyl #2 high low open. Popped off the valve cover and #2 was unplugged. Plugged it back up and truck runs better. Did a buzz test and still getting the #2 high low open.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, X Code Springs, 33" BFGs (SUCK), Alpine W200, Pioneer "D" Series Kevlar 6x8"s, Sirius Satellite Radio, 12" Memphis Pro Audio Subwoofer.
20x10 Mickey Thompson Classic IIs, waiting on tires


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Just because I kiss the prettiest girls and I drive my truck too fast, why does everybody want to kick my @ss?

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