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Old 12-21-2012, 09:43 AM
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Question 96 f-250 xl

any help will be appreciated. old problem that never was solved. been running this truck like this for sometime cause i don't use it much. so this is the problem and what i have done to troubleshoot. problem is a nasty knock at one injector and rough idle.began with knock at #8 injector. moved that injector to #2 hole, knock followed. replaced with a rebuilt injector, no change. replaced with a new injector, no change. checked UVC for ohm value. all within spec and all the same value within less than 1 ohm. checked this from the IDM harness out to each injector and back. had all injectors flow tested, showed good. replaced IDM with known good one, no change.compression test on left bank shows 395-400 #s. truck seems to run fine on hiway, gets decent mileage. at idle sounds like it falling apart. any ideas as to whats going on? why would the knock move from one hole to another but not be an injector problem? fuel psi 55-60 #.

Last edited by danz; 01-16-2013 at 11:39 AM.
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Old 12-23-2012, 06:23 PM
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Is it auto manual? Have you checked fuel pressure.
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Old 12-24-2012, 02:40 PM
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thanks for your response. it is an auto, e40d. no codes on that. i will check that fuel pressure. merry Christmas to you and yours
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Old 12-24-2012, 04:39 PM
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No problem my brother knows a lot about the old 7.3's so will try to relay what I can to help merry Christmas to you too
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Old 01-03-2013, 12:28 PM
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dr. deere

took awhile to get back to you. you wanted to know the fuel pressure. it is 55-60 psi. idle to a rev. moves about 5 psi. truck is starting and running. just pulled a 2 ton jeep on a tow dolly, no trouble. sure turns some heads in the parking lot though. did you get a chance to talk to your brother?
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