defueling - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 11-06-2010, 08:33 PM Thread Starter
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defueling

Besides overboost(24psi or more from what ive heard) what else can make these trucks defuel?

2000 white supercab longbed, 4x4, 7.3 powerstroke, 4r100, predator tuner, straight pipe, k&n, fpr shim , foil delete, zoodad mod, boost fooler, wastegate delete, 3.73s, iah delete, exaust backpressue valve delete
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post #2 of 11 Old 11-06-2010, 09:31 PM
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Need more info for anyone to help.
What exactly is happening?
Give a good,detailed description
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post #3 of 11 Old 11-07-2010, 05:34 AM Thread Starter
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my truck is down on power under load or wot, truck idles fine and drives fine but when power is needed it isnt there, and i have noticed the truck dosent smoke anymore either? Posted about this problem in the motor problems section but no help or replys! THats why im thinkin the truck must be defueling for some reason. Its so bad that if u push it hard enough for a extended period of time u can hear the injector firing without enough fuel. Fuel pump and filter is brand new, icp checks good and just replaced the ipr and cam sensor.

2000 white supercab longbed, 4x4, 7.3 powerstroke, 4r100, predator tuner, straight pipe, k&n, fpr shim , foil delete, zoodad mod, boost fooler, wastegate delete, 3.73s, iah delete, exaust backpressue valve delete
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post #4 of 11 Old 11-07-2010, 07:43 AM Thread Starter
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Simply amazing! out of all the great techs on this website and absolutey no imput!

2000 white supercab longbed, 4x4, 7.3 powerstroke, 4r100, predator tuner, straight pipe, k&n, fpr shim , foil delete, zoodad mod, boost fooler, wastegate delete, 3.73s, iah delete, exaust backpressue valve delete
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post #5 of 11 Old 11-07-2010, 08:00 AM
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What is your fuel pressure? You could have a dieing pump or clogged screen in the tank.


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post #6 of 11 Old 11-07-2010, 08:07 AM Thread Starter
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fuel pressure is 60-65 at idle, pump is brand new, filter is brand new and i did the hutch mod so no prefilters in-tank anymore! screen is not clogged either, just went trough all fuel sustem stuff, injectors buzz fine too!

2000 white supercab longbed, 4x4, 7.3 powerstroke, 4r100, predator tuner, straight pipe, k&n, fpr shim , foil delete, zoodad mod, boost fooler, wastegate delete, 3.73s, iah delete, exaust backpressue valve delete
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post #7 of 11 Old 11-07-2010, 09:51 AM
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What's your fuel pressure when it starts defueling?


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post #8 of 11 Old 11-07-2010, 03:03 PM
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What kind of boost fooler are you running?
Does it wire into the harness?
Your map sensor may be getting false high readings,or sensor could be bad ,have you had it on a scanner yet?
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post #9 of 11 Old 11-07-2010, 04:44 PM Thread Starter
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found the problem today, it was the icp! Friend had a spare and drove around all day and never acted up. Always thought if the icp was bad it would be all the time and not want to start but it was my intermitten problem. The bad sensor was giving the ipr false info only sometimes, not all the time making the truck run with no power.

2000 white supercab longbed, 4x4, 7.3 powerstroke, 4r100, predator tuner, straight pipe, k&n, fpr shim , foil delete, zoodad mod, boost fooler, wastegate delete, 3.73s, iah delete, exaust backpressue valve delete
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post #10 of 11 Old 11-07-2010, 06:22 PM
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Never seen that before-I thought the same as you,either bad or not.
Was it leaking any oil?
Was plug loose,or tight?
How did it test good?
This can be some good info
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