94 bogging under throttle

Discussion in '4.0 Engine' started by JoeNoble, May 25, 2012.

  1. JoeNoble

    JoeNoble New Member

    My 94 seems to idle fine but when I give it throttle it bogs really bad. It started out as an occasional issue and has gotten progressively worse. So I pulled the expensive NGK plugs and put in some cheap autolite plugs as that seems to be whats recommended and the NGKs were black.... REALLY black! Could it be the coil is bad or would it be more of a fuel issue?
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  3. Brinker88

    Brinker88 Black sheep o' the family

    Clean your throttle body and MAF. If that doesnt do it, change your fuel filter and pcv valve.
  4. ZRanger28

    ZRanger28 Got boost?

    if they are black that means you are fouling out the flugs with to much fuel. check the vaccum line on the fuel rail mounted fuel regulator and make sure its connected.

    how do the autolite plugs look? also what motor do you have?

    when you ge ton the gas. does black smoke come out of the exhaust?
  5. OP

    JoeNoble New Member

    Yeah I cleaned the TB and changed the fuel filter and pcv. And yeah there was some black smoke. However I just did a fuel pressure test and it had 30psi the book said it should have 30-45. I also checked the vac hose on the fpr and though it wasn't very snug it hadn't come off but there was some moisture in there. But once I was done with the test and put everything back she seems to run fine so somehow by checking the fuel pressure I fixed it?
  6. OP

    JoeNoble New Member

    Ok so I put in a new fpr and the problem came back then I realized that there was a crack in my stock intake tube and the seals where dry rotted so I made a new intake and it's much better but still hesitates sometimes and lacks power. Any ideas?

  7. Try swapping the coil pack/distributor cap and rotor (if it has one. Not sure on whether the older trucks have coils or caps and rotors) out for a new one. Did you replace the wires when you did the plugs?
  8. OP

    JoeNoble New Member

    It's got a distributorless ignition and the coil is kinda pricey but I did test it at work and got the same readings as a brand new one off the shelf. Plus and wires are brand new.
  9. Hooligan

    Hooligan Rangerholic!!

    I know those years of rangers had some issues with a sensor/sending unit which I believe is near the fuel pump but I dont think that is your problem. Most important question is what engine do you have? I had the very same issue on a 2.3, which has 2 coil packs. One was bad, and it needed plugs and wires. Double check those, plug gaps, and make sure those wires are good. Let us know what engine you have and I will help you research it.
  10. OP

    JoeNoble New Member

    Sorry it's the 4.0 the wires are new.... The plugs were new but are probably fouled out by now so I'll be replacing them but I wanna make sure there aren't any other problems first cuz I don't wanna have to keep replacing them.
  11. OP

    JoeNoble New Member

    So I borrowed an OBD1 code reader and it flashed code 59 which among other things could be a fuel pump issue?
  12. Black mamba

    Black mamba The mannnn

    Could be man, I was always having file pump problems in my 89...

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