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  1. #1
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    msx 140, no spark

    I installed a new agm battery, the engine cranks over just fine, but there is no spark on all 3 plugs. What did I do?

    battery voltage is 12.8 v
    polarity is correct
    fuses all ok
    swapped and tried another battery, still no spark.

    HELP !

    smokewagon,


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Is the lanyard in place?

  3. #3
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    Yes, I actually tried several different ones, even pulling it out manually.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by SMOKEWAGON View Post
    Yes, I actually tried several different ones, even pulling it out manually.
    Quote Originally Posted by K447 View Post
    Is the lanyard in place?
    Remind us what the recent history of this machine is?

    Is the NGI display working normally?

    Does it wake up automatically when the engine starts cranking?

  5. #5
    ph2ocraft's Avatar
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    What is your cranking voltage measured at the battery?

  6. #6
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    Cranking voltage is 11.5 v.

    Yes, the display lights up when cranking, also the red light blinks and it
    gives the check engine notice.

    I am totally stumped on this one.........


    smoke,

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by SMOKEWAGON View Post
    ...check engine notice...
    Have you covered the basics?

    CPS resistance (should be circa 150 ohms)?

    TPS unplugged, does it start?

    Fuel pressure present while cranking?
    Injector voltage 20+ volts while cranking?

  8. #8
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    I will check all those today and get back with you.

    When checking coil resistance, where do you contact for primary, and
    where do you contact for secondary?

    smoke

  9. #9
    pro12,txi,msx140 SMOKEWAGON's Avatar
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    Found it ! Unplugged the TPS and it starts, so I will swap out the TPS today. Good call K447 !! Thanks to you and Al we are up and running. There is enough knowledge here to be dangerous.

    We are hitting the river tomorrow for a quick 125mi run, the weather
    forecast is 85 and sunny, no wind all week.


    smoke

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Bad TPS can cause no spark condition

    Quote Originally Posted by SMOKEWAGON View Post
    Found it ! Unplugged the TPS and it starts, so I will swap out the TPS today...
    If you could, post a photo of the back side of the 'bad' TPS, showing the part number, and what the whole thing looks like.

    I suspect it is an early version of the TPS, with a metal back and a plastic 'retaining strap'. Some of the TPS revisions may NOT have different part numbers, but looked slightly different, so the photo might be helpful to myself and others.

    BTW, the Ficht EMM has a feature whereby if the throttle is held wide open then engine will crank without spark (or fuel, I think). Helpful for some diagnostics (compression test, starter/solenoid testing).

    If the TPS goes bad, and sends an incorrect WOT signal to the EMM, you get no spark during cranking.

    I think you can confirm this by connecting a timing light inductive pickup around ONE of the wires going to an injector. The timing light should fire when the engine is cranking, IF the injectors are firing. If you have no injection activity, AND no spark, then the EMM thinks you are at WOT, or the EMM does not know the engine is rotating (no CPS signal).

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