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Thread: rough running low power 00 7.3

  1. #1
    Registered User Joey D's Avatar
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    Default rough running low power 00 7.3

    My 450 started running like crap today, idle is low, rough running until rpms come up and no power.
    98 6.5 K2500 4l80, dynatrac pro rock 60 front with Longfield CV shafts, arb air lockers front and rear, 4.56 gears, ATT, 37 BFG KM 2's
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    I welcome everyone...not just Penguins! DEERE3594's Avatar
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    fuel filters?
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  3. #3
    Registered User Joey D's Avatar
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    I will change it today to be sure but it has less than 2000 miles on it.
    98 6.5 K2500 4l80, dynatrac pro rock 60 front with Longfield CV shafts, arb air lockers front and rear, 4.56 gears, ATT, 37 BFG KM 2's
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  4. #4
    The Decal Man
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    check the oil sounds stupid but theres a safety when the oil gets low they dont run well
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  5. #5
    Registered User Joey D's Avatar
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    I checked the oil and swapped out the fuel filter, I drained the bowl before putting in the new element. Starrted up and it's much better. I am going down to drive it around and see if it is fine.
    98 6.5 K2500 4l80, dynatrac pro rock 60 front with Longfield CV shafts, arb air lockers front and rear, 4.56 gears, ATT, 37 BFG KM 2's
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  6. #6
    Agent #58 OB-DII A(ALCU) Clark20ry's Avatar
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    Quote Originally Posted by Diesel Decals View Post
    check the oil sounds stupid but theres a safety when the oil gets low they dont run well
    Quote Originally Posted by Joey D View Post
    I checked the oil and swapped out the fuel filter, I drained the bowl before putting in the new element. Starrted up and it's much better. I am going down to drive it around and see if it is fine.
    My neighbor just found out that oil level is very important. His 7.3 ran real rough when cold but got better as it warmed. It finally died the other day he did some research and found out that the (forgive me if its a little vague) there is a high pressure oil pump that creates the fuel pressure (fords equal to the CP3). He was real low on oil so it just was not able to build enough fuel pressure. He added a whold gallon (it leaks) I heard it fire up shortly after he charged both batteries. So be sure to check your oil....
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    Registered User Golddigger's Avatar
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    There is an expensive repacement for that HUEI pump. It is supposed to be way better and manage the oil pressure better. I think is 2 machined to go back to back.
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  8. #8
    Registered User Joey D's Avatar
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    Now it goes back and forth between running fine then running like crap.
    98 6.5 K2500 4l80, dynatrac pro rock 60 front with Longfield CV shafts, arb air lockers front and rear, 4.56 gears, ATT, 37 BFG KM 2's
    06 D Max Express

  9. #9
    Registered User Golddigger's Avatar
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    They did have injector harness issues with the 7.3. You might check your dealer for info.
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  10. #10
    Registered User Joey D's Avatar
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    I swapped out the injector pressure sensor and it solved it. Thanks for the help
    98 6.5 K2500 4l80, dynatrac pro rock 60 front with Longfield CV shafts, arb air lockers front and rear, 4.56 gears, ATT, 37 BFG KM 2's
    06 D Max Express

  11. #11
    #78 A(ACLU) FNG jcool's Avatar
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    Quote Originally Posted by Clark20ry View Post
    My neighbor just found out that oil level is very important. His 7.3 ran real rough when cold but got better as it warmed. It finally died the other day he did some research and found out that the (forgive me if its a little vague) there is a high pressure oil pump that creates the fuel pressure (fords equal to the CP3). He was real low on oil so it just was not able to build enough fuel pressure. He added a whold gallon (it leaks) I heard it fire up shortly after he charged both batteries. So be sure to check your oil....
    what a idiot! how do you not keep an eye on your oil!!!
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  12. #12
    v- I miss this truck. -v 83GMCK2500's Avatar
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    Quote Originally Posted by jcool View Post
    what a idiot! how do you not keep an eye on your oil!!!
    Justin, the irrigation company I used to work for had a 91 or so F-Super Duty with a really wore out Navistar 7.3L IDI (non turbo) backed by a wore out 5-speed. The truck had a utility box and boom for pulling/setting submersibles, it would burn at LEAST a gallon of oil going out to a job, working, and coming back. That's a 50 mile round trip. That's if I babied it, if I kept my foot in it the EPA would pick it up on a satellite and get pissed...when I worked there I'd add up to 2 gallons, depending on how it was driven.
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  13. #13
    #78 A(ACLU) FNG jcool's Avatar
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    Quote Originally Posted by 83GMCK2500 View Post
    Justin, the irrigation company I used to work for had a 91 or so F-Super Duty with a really wore out Navistar 7.3L IDI (non turbo) backed by a wore out 5-speed. The truck had a utility box and boom for pulling/setting submersibles, it would burn at LEAST a gallon of oil going out to a job, working, and coming back. That's a 50 mile round trip. That's if I babied it, if I kept my foot in it the EPA would pick it up on a satellite and get pissed...when I worked there I'd add up to 2 gallons, depending on how it was driven.

    um... wow.... thats more than burning/ leaking oil.... it would have been cheaper to fix it than keep throwing oil at it!
    -Justin

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  14. #14
    v- I miss this truck. -v 83GMCK2500's Avatar
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    Default

    It smelled horrible idling. The cloud of smoke that it gave off was NOT soot. If it hadn't been ran in a while and was 40 degrees or less outside I had to give it a shot of WD-40 in the air intake to get it to start. It was wore out, I'm not kidding...I think it had ~170k miles on it.
    Devin


    1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt. Been in the family since new, see it's history in My Garage.

    ╔═══╦═══╦═══╗
    ╠═══╬GMC╬═══╣
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    R.I.P Jason (willyswanter) Payne

  15. #15
    #78 A(ACLU) FNG jcool's Avatar
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    Quote Originally Posted by 83GMCK2500 View Post
    It smelled horrible idling. The cloud of smoke that it gave off was NOT soot. If it hadn't been ran in a while and was 40 degrees or less outside I had to give it a shot of WD-40 in the air intake to get it to start. It was wore out, I'm not kidding...I think it had ~170k miles on it.
    was it poorly maintained or just a bad apple? that thing should have gotten a lot more mileage on it than that!
    -Justin

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