Help, White Magic truck mount engine spitting and misfiring

Discussion in 'Ask Our Repairmen' started by Rob Allen, Nov 19, 2009.

  1. Rob Allen Administrator

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    Recently my White Magic Triton LS truck mount that has a 60 hp fuel injected engine has been running rough when I first start it. It used to start right up , now it takes a few more seconds. Sometimes it will backfire. While it warms up it runs rough but as soon as I move the idle up it starts to even out. Then it runs ok till I finish the job. Any ideas what may be going on??

    Rob
  2. Ara Klujian Moderator & TMF Repair Expert

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    This could be a number of things happening. Some problems you may want to look at would be faulty O2 sensors, Timing issue with the distributor, bad distributor cap and rotor, fuel pressure regulator, fuel filter, Faulty MAF, ECU running cold/open loop could be applying the wrong A/F ratio.
  3. ACC New Member

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    Becuase it is fuel injection , your injectors may simply need to be cleaned.
  4. Kevin Dumas Member

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    I would start with a fresh set of spark plugs. Then go from there.
  5. kelly m New Member

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    how does the vehicle it is mounted in run?
  6. Rob Allen Administrator

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    I put in some gas dryer and it cleared up a bit. However when cold it still does it. I find if I turn the rpm's high it does not do it much. How would the rpm's make a difference??
  7. Ara Klujian Moderator & TMF Repair Expert

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    Could be a vacuum leak. Something on the intake could have a leak. Does it have emission lines? I thought white magic only had direct drives?
  8. Rob Allen Administrator

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    They offer a complete line of slide ins also Ara. Granted the ptos have a far better reputation than the slide ins. It will run fine then bog or sound like it is shutting off for a second, like a hiccup. Then it runs fine but hiccups and makes me believe it is going to shut off fully but doesn't. Odd and frustrating.

    Rob
  9. gtech12v Member

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    try to reset your ECM
    check your fuel line filter
  10. Ara Klujian Moderator & TMF Repair Expert

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    have you tried misting water on the spark plug wires? It could also be cross firing. Or a bad misfire somewhere. Try pulling the plugs out one at a time. The bad cylander will not change and rpm or problem will still be there. That is how you find the bad cylander.
  11. Rob Allen Administrator

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    OK I replaced the spark plugs last night. There was a little improvement, but not much. Still runs ratty at low rpms but ok at high. It will backfire sometimes when I try to start it too. :mad:
  12. Ara Klujian Moderator & TMF Repair Expert

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    Have you checked the timing with a timing light?
  13. Rob Allen Administrator

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    Really would not how Ara.

    I did notice something yesterday. I had an auxiliary temperature gauge set up inside the machine. I found it severely damaged under the cover. Apparently it slipped into the radiator fan and was damaged. Could this knock off the timing or cause some similar issue? I have since removed it.

    Thanks
  14. Ara Klujian Moderator & TMF Repair Expert

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    You can rent a timing light from an auto parts store. No way that would disrupt timing.
  15. Ara Klujian Moderator & TMF Repair Expert

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    Whats the condition of the distributor cap and rotor?
  16. Rob Allen Administrator

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    Not sure the condition of the rotor or cap. Ara maybe I should give it as complete as a tuneup as I can. perhaps you could suggest a list of things to do with this fuel injected 60hp Ford Industrial gas engine. I'll give it a go.
  17. Ara Klujian Moderator & TMF Repair Expert

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    Its quite simple to remove the cap to have a look see. Just dont overtighten it when putting it back is all. I bet thats your problem.
  18. Chris Sheldon User

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    The only thing you can do on that engine as far as a tune-up goes is to replace the plugs and wires. There is no dist cap or rotor.

    I am with Ara's line of thinking on a vac leak. To check for a vac leak, Rob, run the machine and then spray around the intake manifold/throttle body area with carb cleaner, if there is a leak, the engine rpm will smooth out for a second when the carb cleaner enters the leak.

    On a similar note, my wifes Explorer started running like doo-doo in the morning, but would run fine once it warmed up. I took it to 2 mechanics who could not figure it out, I ended up taking off the intake manifold and found one of the o-rings had a chunk out of it. I bought the $20 gasket kit from NAPA, put the manifold back together and it runs great.
  19. Ara Klujian Moderator & TMF Repair Expert

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    Thats why im glad we have you around Chris. This is why I need service manuals for these truckmounts. So I can give proper feedback. Half the the time I gather diagnostics from my head without know exactly what the setup is. My brain is like a diagnostic tool that spits out info like a printer.:rolleyes:
  20. Chris Sheldon User

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    Some of these manuals are hard to come by and the TM manufacturers don't usually include service manuals for the engines. I only have one custy who has this Ford fuel injected engine, so I am not too familiar with it myself.

    If we put our heads together Ara, we can solve alot of this stuff!

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