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Thread: Kohler Bobcat 250EFI No Spark One Side.

  1. #1
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    Kohler Bobcat 250EFI No Spark One Side.

    So, one cylinder quit firing.

    I used one of those spark testers that goes in line between the spark plug and the coil, and no spark.

    The coil on the other side tested good, so I put it in place of the no-spark coil, and no spark.

    Country-boy logic would indicate that the coil is not the problem.

    Sorta stumped.

    I guess the dead side isn't getting a signal, but I don't know where to start.

    Ideas?

  2. #2
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by johnnybanzai View Post
    So, one cylinder quit firing.

    I used one of those spark testers that goes in line between the spark plug and the coil, and no spark.

    The coil on the other side tested good, so I put it in place of the no-spark coil, and no spark.

    Country-boy logic would indicate that the coil is not the problem.

    Sorta stumped.

    I guess the dead side isn't getting a signal, but I don't know where to start.

    Ideas?

    Search Kohler bobcat for manual. I'm not familiar with bobcat and only know enuf to keep stuf running long enuf to get paid.

    The last Kohler I worked on had a gap for stator windings/magnet.

    Have tried different spark plug wire ?

    Start from the spark plug and work backwards.
    Last edited by Insaneride; 10-01-2021 at 08:48 PM.

  3. #3
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by Insaneride View Post
    Search Kohler bobcat for manual. I'm not familiar with bobcat and only know enuf to keep stuf running long enuf to get paid.

    The last Kohler I worked on had a gap for stator windings/magnet.

    Have tried different spark plug wire ?

    Start from the spark plug and work backwards.
    Thanks.

    The coil and plug wire are assembled together as a unit. Both units are working, just not when they are connected to the one cylinder.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by johnnybanzai View Post
    Thanks.

    The coil and plug wire are assembled together as a unit. Both units are working, just not when they are connected to the one cylinder.
    Ok
    I was confused. I thought you had a bobcat Kohler

    I'm So confused. You have a bobcat welder?

    With a Kohler.

    What model Kohler. K model, hurricane?

  5. #5
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    You need to look up your model Kohler

    What I think your saying is , " only one cylinder frying ". No?








    Edit:

    Kohler Bobcat engines versus K or the hurricane
    Last edited by Insaneride; 10-01-2021 at 09:53 PM.

  6. #6
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Country boy logic
    Swap spark plug wires to determine if the wires are conducting the hi voltage coil, condenser buck. No?

    Johnibanzi (sp?) what model Kohler and horse power do you have?
    Last edited by Insaneride; 10-01-2021 at 10:05 PM.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    OK.

    So, it's the Miller Bobcat 250EFI built in 2015.

    It is equipped with a Kohler ECH 730 two-cylinder engine.

    One cylinder is not sparking.

    I removed the coil pack from the cylinder that is sparking and installed it on the cylinder that is not sparking.

    The result was that it still would not spark.

    I have determined to my own satisfaction that the coil pack itself is not the problem, and I am hoping that some wise soul can direct me further down the path toward getting this resolved.

    Thank you.

  8. #8
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Did you try swapping spark plugs or look at them?
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    With the amount of wire harness and number
    of connectors on that EFI I would be looking
    at connections next. Looks like signal to coils
    goes through harness and several connectors.
    That engine makes my CH730 look primitive.
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by jpump5 View Post
    With the amount of wire harness and number
    of connectors on that EFI I would be looking
    at connections next. Looks like signal to coils
    goes through harness and several connectors.
    That engine makes my CH730 look primitive.
    Ha!

    Yes, I downloaded the manual for the Kohler last night, and it has about 75 pages of nothing but electronic ignition and fuel injection.

    UGH!

    Nevertheless, I will pull and inspect the spark plug first, as you never know when you might get lucky!

    Thanks, fellas.

    Don't hesitate to throw in your 2 worth!

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Thanks.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    I've seen plugs that "looked" good under inspection, but failed to fire consistently under compression. Seems to be worse with resister style plugs. Try new plugs before you get too involved.
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by whtbaron View Post
    I've seen plugs that "looked" good under inspection, but failed to fire consistently under compression. Seems to be worse with resister style plugs. Try new plugs before you get too involved.
    I used one of those in-line spark testers grounded directly to the block.

    No joy.

    This doesn't mean the spark plug is any good, just that it is not getting spark.

    Either coil behaves the same way: Sparks for one side but not the other.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    so, when you change the coil pack from bad cylinder to working cylinder, you're good? coil packs are working. they are picking up impulse from crankshaft or cam shaft rotation via sensor and my guess is that sensor for problem cylinder. I will grab my book on my kohler engine (lawnmower) and have a look see. Should I learn anything, will report back.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by BillE.Dee View Post
    so, when you change the coil pack from bad cylinder to working cylinder, you're good? coil packs are working. they are picking up impulse from crankshaft or cam shaft rotation via sensor and my guess is that sensor for problem cylinder. I will grab my book on my kohler engine (lawnmower) and have a look see. Should I learn anything, will report back.
    To clarify, both coil packs spark when installed on one cylinder, and do not spark when installed on the other.

    I am not familiar with this system, or really with electronic ignition in general, but the parts list shows only one crankshaft position sensor, and it is clearly functioning . . . on one side.!

    Opening a gap between the engine and the control panel that would be big enough to get the engine cowling out of the way looks like a real . . . adventure.

    I paid short money for this machine so tearing it down into little bitty pieces to replace a $6.34 part is annoying but not impossible.

    Before I launch into such a project, I would very much like to track down the most likely culprit.

    Thank you very kindly for your time.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    I can't find anything on the engine on specifics. I will try another source for info. I don't know where the timing would come in with only one cps, therefore, Wondering IF there are 2 separate wires in the harness to activate the coils...and one of those wires is broken within the harness.

  18. #17
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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by BillE.Dee View Post
    I can't find anything on the engine on specifics. I will try another source for info. I don't know where the timing would come in with only one cps, therefore, Wondering IF there are 2 separate wires in the harness to activate the coils...and one of those wires is broken within the harness.
    This is my fondest hope, at this point.

    I mean, it's almost gotta be, right?

    The thing is that the wire harness disappears into the engine shroud/cowling and getting access will be a straight up pain in the butt.

    I'm hoping someone who has conquered this problem before will show up.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    May as well get out the multi-meter and check continuity for the wire. I don't know anything about them, but, sorry, I have a feeling you'll be taking the shroud off one way or the other...

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by Weldalittle View Post
    May as well get out the multi-meter and check continuity for the wire. I don't know anything about them, but, sorry, I have a feeling you'll be taking the shroud off one way or the other...
    Yeah.

    Even just checking for continuity I'll have to get to the other end of the wire!

    As I'm sure you're aware, taking things apart is usually the easy part!

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Quote Originally Posted by johnnybanzai View Post
    As I'm sure you're aware, taking things apart is usually the easy part!
    Take pictures, put parts in marked ziplock bags etc. Big parts just get tape and permanent marker labels. I've found that the safest way when dealing with something for the first time. Keep it all in a box etc. If you have to put the job on hold for an unexpected time, it will all be safe and organized when you get back to it.

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    Re: Kohler Bobcat 250EFI No Spark One Side.

    Have you actually removed the spark plugs and inspected them?
    If someone dropped the plug and bent the ground electrode down against the center electrode
    it will ground out the spark and your spark tester will indicate that there is "no spark".
    Of course if you are using one of the old fashioned spark testers that has an actual spark gap then
    ignore everything I just said!

    Back up and look at it again. It has been my experience that most people (sometimes me) overlook the obvious!

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