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1993 Polaris Indy 500 SKS EFI just wont start.

This is a discussion on 1993 Polaris Indy 500 SKS EFI just wont start. within the Polaris forums, part of the Brand Specific Snowmobile Discussion category; We had a 92 that was hard starting.. They came out with a recall for it that added a primer switch to our 92 They ...

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Thread: 1993 Polaris Indy 500 SKS EFI just wont start.

  1. #11
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    SnoKing's Avatar
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    We had a 92 that was hard starting.. They came out with a recall for it that added a primer switch to our 92
    They made a change to the 93 to correct the problem to get fuel in. As mentioned earlier the fuel pump should cycle to add fuel when starting. Sounds like it wasn't and the wiring you did is now flooding.

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    Quote Originally Posted by SnoKing View Post
    We had a 92 that was hard starting.. They came out with a recall for it that added a primer switch to our 92
    They made a change to the 93 to correct the problem to get fuel in. As mentioned earlier the fuel pump should cycle to add fuel when starting. Sounds like it wasn't and the wiring you did is now flooding.
    We removed the temp hot wire and cleared the engine post trial

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    Quote Originally Posted by GYPSY400 View Post
    Check the voltage regulator thingy ( I can't remember what it is called).. that is the component that wakes up the fuel pump and ecm on start up.. I had to re-engineer mine because the part is not available.

    Sent from my SM-G960W using Tapatalk
    The part I was referring to is called the ACS.
    Google on how to test it.. remember, just because the fuel pump works doesn't mean the ecm is telling the injectors to fire.
    I reworked mine by adding a toggle switch for the fuel pump and installing a generic voltage rectifier to power the DC circuits.

    Sent from my SM-G960W using Tapatalk

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    disconnect an injector connector and install a 12v bulb and see if it flashed when cranking. This will indicate an injector pulse.
    1973 Eltigre 500cc mod
    1975 Suzuki 440 Fury
    1995 XCR 440 SP
    1997 Indy Lite
    1999 XC 600
    2002 Supersport

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    The ignition switch anq, aux11iary kill switch are
    connected in series wi h the E0U COl signal. If these
    switches are leaking partial voltages to ground, the
    ECU will not function properly. Whenever COlor
    intermittent running problems are occurring, the
    switches should be suspect for potential problems.
    These switches will also fail more often when humidity
    is high. To troubleshoot the switches, disconnect or
    isolate them from the circuit.
    1973 Eltigre 500cc mod
    1975 Suzuki 440 Fury
    1995 XCR 440 SP
    1997 Indy Lite
    1999 XC 600
    2002 Supersport

  6. #16
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    I have been working on EFI for many years in the automotive field but have not done any snowmobile work.
    I did look at the information in the link for the 93 service manual and I think you should be able to diagnose using this info.
    I would look at the ECU connector first to make sure you have good power and ground.
    I like to use a high current test lamp to check these. An old halogen fog lamp bulb usually draws enough current to test most circuits. I have been fooled before by just using a volt meter to check power and ground circuits because corrosion will limit current flow (amperage) but will show correct voltage.
    Just one strand of copper in a wire will show correct voltage but will not flow enough current.
    If power and ground is ok check the ECU diagnostics section on of 76 and find the ECU LED indicator, there are 2 wires that you connect that will then flash trouble codes thru this LED to help isolate the circuit that is causing the problem.
    I hope this helps.
    1973 Eltigre 500cc mod
    1975 Suzuki 440 Fury
    1995 XCR 440 SP
    1997 Indy Lite
    1999 XC 600
    2002 Supersport

  7. #17
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    Quote Originally Posted by indyxc6 View Post
    I have been working on EFI for many years in the automotive field but have not done any snowmobile work.
    I did look at the information in the link for the 93 service manual and I think you should be able to diagnose using this info.
    I would look at the ECU connector first to make sure you have good power and ground.
    I like to use a high current test lamp to check these. An old halogen fog lamp bulb usually draws enough current to test most circuits. I have been fooled before by just using a volt meter to check power and ground circuits because corrosion will limit current flow (amperage) but will show correct voltage.
    Just one strand of copper in a wire will show correct voltage but will not flow enough current.
    If power and ground is ok check the ECU diagnostics section on of 76 and find the ECU LED indicator, there are 2 wires that you connect that will then flash trouble codes thru this LED to help isolate the circuit that is causing the problem.
    I hope this helps.
    we will track this down today. Confirm for me that the ECU is located in the EFI box?

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    Quote Originally Posted by indyxc6 View Post
    disconnect an injector connector and install a 12v bulb and see if it flashed when cranking. This will indicate an injector pulse.
    We will do this also today! Thanks for the help every one keep it coming

  9. #19
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    yes the EFI box and the ECU (electronic control unit) are one in the same.
    1973 Eltigre 500cc mod
    1975 Suzuki 440 Fury
    1995 XCR 440 SP
    1997 Indy Lite
    1999 XC 600
    2002 Supersport

  10. #20
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    Quote Originally Posted by indyxc6 View Post
    yes the EFI box and the ECU (electronic control unit) are one in the same.
    thank you!!!

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