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I think it's time to replace the EHC

Discussion in 'EFI Topics' started by Tdubb, Feb 3, 2017.

  1. Tdubb

    Tdubb Active Member

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    Yep, staring at it seems to work well. It's also been helpful to replace a component or change back to an old suspect component, but I've found it's easier to just stare at it.
     
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  2. dentdude36

    dentdude36 Guru

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    :oldhardlaugh:
     
  3. Th3InfamousI

    Supporting Member

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    I'd say if you stare at it and it works thats an EHC.

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  4. Tdubb

    Tdubb Active Member

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    My best story for this problem is as follows:
    Decided to go meet a friend for a day of riding. Got 4 or 5 miles from the house and the bike dies when I pull up to a stop sign. Bike won't restart. Fuel pump won't energize. Call my buddy and he shows about 20 minutes later. Bike still won't start. I call my wife and she comes and gets me. We drive to uhaul and get a trailer. We return and I can't get the bike on the trailer because the frame drags. So I'm pissed and decide to try and start it. It fires right up and my wife follows me home.
     
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  5. Th3InfamousI

    Supporting Member

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    Yea EHC...and that's a bummer story.

    Uhaul box truck you need a long ramp or a little hill even with that low deck height

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  6. pauldeepsea

    pauldeepsea Well-Known Member

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    After re reading your post I am wondering if there is a issue with your cam sensor, ignition module.
     
  7. Tdubb

    Tdubb Active Member

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    How would either of those two components cause the fuel pump to not energize when I hit the run button?
     
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  8. DrRx

    DrRx 2007 Bulldog/2009 K-9

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    I'm thinking seriously since it's efi, correct, your problem is in your efi unit. Or harness between esc and efi units. Guys correct my if I'm wrong but there is no ignition module and all pumps and spark are controlled by the s&s efi module. Now you may have some electrical issues between the esc and efi connections cause the esc runs the start button then sends signal to vfi to run the pump then vfi primes the pump. I think that is how it works!


    DrRx- "DOC"
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  9. dentdude36

    dentdude36 Guru

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    That's what I been saying get usncheif involves he had to replace his ecm
     
  10. DrRx

    DrRx 2007 Bulldog/2009 K-9

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    So, lol back to my original post DOC's esc will solve your problem because it comes with complete wire harness and set up for efi if requested. Axels does not come with wire harness. And wire plus isn't made for efi , it can do it but it sucks I had one and yanked it. Replaced by DOC's


    DrRx- "DOC"
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  11. Tdubb

    Tdubb Active Member

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    If I understand it correctly, the EHC provides relay power to the fuel pump through the EFI. The wiring diagram appears that it's just pass through. The EFI regulates the amount of fuel via the injectors. Since I don't get the pump to energize I'm assuming it's the EHC. The intermittent stumbling of the engine has never been caught by a computer hooked up to the bike. So I can only assume. But since I have the starting issue immediately after the engine stumbling issue, I'm assuming the power to the fuel pump is cutting in and out for a 1/2 second or so.
     
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  12. dentdude36

    dentdude36 Guru

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    I have a message out to another member to add some info here , his root of the same issues was the ecm he got a new one from s&s problem solved not his ehc
     
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  13. Tdubb

    Tdubb Active Member

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    That same relay control from the EHC supplies power to the ignition coil, the oxygen sensors and the fuel injectors.
     
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  14. DrRx

    DrRx 2007 Bulldog/2009 K-9

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    So if it's the s&s vfi unit you need, curtis@wild steed can get it. S&S won't sell to you unless your a distributor. Or at least that's what they told me when I replaced my vfi module. That is also about 5-600 $ but personally I think it's your harness.


    DrRx- "DOC"
    2007 bulldog/2009 K-9
     
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  15. Spikes05

    Spikes05 Member

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    Well I would call doc and tell him what kinds of things you are dealing with. I also think that being that your bike is fuel injected that you might be having trouble with your fuel pump and or fuel management system like Viking and the other bagger guys are having. Check into the bagger posts to see if you have any of their issues from what I read on them it sounds like you are having a lot of the same problems. But please call doc he will help you with whatever he can and won't try to sell you anything he leaves all the options up to you.


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  16. Kiwirider

    Kiwirider Active Member

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    Did the EHC replacement fix your issues? I have the same bike and have been having the same issues as you. Now it's to the point where I can hit the run button, wait a few mins not touching the bike and then it will magically prime itself.
    Mine started like you, about 5yrs ago with the odd random check eng light and cutting out, then come back to life. Now I can't even get out the driveway without it cutting out. The exact same symptoms as you.


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    #56 Kiwirider, Jul 4, 2017
    Last edited: Jul 4, 2017
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