2000 rpm hesitation - Ford Powerstroke Diesel Forum
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Old 02-09-2014, 06:25 AM
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2000 rpm hesitation

Problem - in neutral if you rev truck cold or warm it will stopped around 2000it rpms stumble had it backfire like a car once after a second of this it will the jump to rev limiter.
During the hesitation it smokes bluish white perfusely and immediately clears.when jumps to redline.

Fixes tried - re oring original injectors
electric fuel. Constantly 65 psi
Drain fuel tank and refill with new.
different known good injectors also with their own new orings
tried different idm out of good running truck
checked ipr tin nut, changed ipr solenoid with known good. Cant remember if i tried my spare ipr
Disconnected icp and ran
Checked for burnt pins on injector harnesd


Pickup info - 96 f250. A previous owner had it chiped, 2 reman injectors. Garret intercooler with pipes that go into wheel wells unknown brand. 3'' downpipe open exhaust


What should i try next to get rid of this wretched problem? I have 2 spare stock hpops, spare ipr, i could go get new uvchs have spare vc gaskets unused
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Old 02-09-2014, 06:39 AM
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It sounds like your egr valve may be sticking. I had a similar problem , sometimes truck would be sluggish off the line and smoke like crazy and after a few seconds truck would run great. Dealer diagnosed it with bad egr valve, code p040. You could try cleaning yours first, my egr valve had 157k on it. No issues after new egr valve was put in. Good luck.
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Old 02-09-2014, 07:00 AM
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No egr on an OBS, Sounds like either another injector going out or a high pressure oil issue. Have access to a good scanner?
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Old 02-09-2014, 07:14 AM
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I can get it scanned. It cant be an injector issue as i swapped a good set of 8 i had on hand in. Im figouring i have it narrowed down to. Oil pressure. Ipr or hpop bad, or uvchs. Just want to see if anyone has more light to shine on the problem then i currently have.
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Old 02-09-2014, 07:28 AM
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Out of curiosity how do you know they are good?
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Old 02-09-2014, 08:22 AM
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I pulled them out if a truck that was in an accident. Ran and drove just fine
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Old 02-09-2014, 08:28 AM
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That doesnt mean a whole lot. They may only be good cause the fuel/high pressure oil systems were able to keep up with a bad injector.

All I am saying is dont rule it out. A contribution test will tell you a lot
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Old 02-09-2014, 08:44 AM
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I can do a buzz test cant do a contribution due to zf5 swap and having auto cpu.
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Old 02-09-2014, 10:51 AM
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Ewww yeah that causes an issue. A buzz test will tell you a lot about the UVCHs and wiring
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  #10  
Old 02-12-2014, 08:35 AM
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Well after ipr swap and oil change problem appears to be gone for now.
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