Bucking in any gear , Coil ? swaped engines

Discussion in 'Electrical' started by Sisco Kid, Dec 28, 2011.

  1. Sisco Kid

    Sisco Kid New Member

    I have a 97 Ranger had everything replaced , used 4.0 v6 2wd , only thing original is wiring harness and ECU , bought new coil swaped still bucking at 2.5-3000 RPM. Has anyone had this problem ?

    I am new to the forum, not new to Rangers had many never this problem , I replaced engine now at a loss for words.It has to be electrical but different engine and same problem is strange.
     
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  3. Hooligan

    Hooligan Rangerholic!!

    Plugs, wires & coils all replaced?
     
  4. OP
    Sisco Kid

    Sisco Kid New Member

    all replaced, never had this.
     
  5. OP
    Sisco Kid

    Sisco Kid New Member

    Same problem, used engine , diff coil, new fuel filter, new wires and plugs, new fuel pump and fuel sensor. Any help plz
     
  6. Hooligan

    Hooligan Rangerholic!!

    I had the same situation, bad coil pack and plugs so other than that I would take a shot in the dark and say EGR maybe but I'm stumped!
     
  7. OP
    Sisco Kid

    Sisco Kid New Member

    New EGR , I am waiting for a code , last was crank shaft pos sensor.. read that was false code..ECU learing. I am going to switch out wiring harness then tackle ECU , how much does dealership charge remap or update on ECU
     
  8. Hooligan

    Hooligan Rangerholic!!

    If you go to a dealer....bring KY
     
  9. klinger86

    klinger86 Moderator

    or vasoline.....
     
  10. Hooligan

    Hooligan Rangerholic!!


    Have a dealer look at it, hopefully you know someone that can look for free. Any codes coming up?
     
  11. OP
    Sisco Kid

    Sisco Kid New Member

    If I end up having to go the the dealership I will only have them update the maps on the ECU thats it. I have been driving for 400 miles and it does it every other day sometimes it bucks the whole way and other times it is every now and then. Damn pain in the ass. I am going to get the wiringing harness off the other engine that was bad maybe that with fix it.
     
  12. OP
    Sisco Kid

    Sisco Kid New Member

    No codes thats why I am trying to put some miles on it so A code will come up.
     

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