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1992 Indy 500 SP EFI fueling issue?

This is a discussion on 1992 Indy 500 SP EFI fueling issue? within the Polaris forums, part of the Brand Specific Snowmobile Discussion category; The fuel pressure should be around 35 psi without the return line pinched, if it is higher that will cause over-fueling. There are 3 other ...

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Thread: 1992 Indy 500 SP EFI fueling issue?

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    Ugly_old_Poo_kid's Avatar
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    The fuel pressure should be around 35 psi without the return line pinched, if it is higher that will cause over-fueling.

    There are 3 other easy explanations for the over fueling:

    - one being that the mice chewed the wiring to the injectors, allowing the wires to rub ground. When they ground, that's the same as the ECU telling the the injectors to fire.
    - another is, the ECU itself is failing. I have has an RXL ECU fail in this way, but never seen it happen with a 500.
    - third is a sensor is failing, telling the ECU that the temperature is much colder than it really is, causing the over fueling.

    Check all the wiring for mouse chews, and repair anything you find. See if that fixed the problem.

    Try unplugging each of the sensors one at a time and drain the crankcases again, this will put it in limp mode. Any particular one that stops the over-fueling when disconnected needs replacing. But if it keeps over fueling after trying all of them, the ECU is failing.

    Honestly, 'select monitor' would help you out a lot. There's the original polaris shop tool stand-alone unit, or software that you can download and use a USB converter to hook to the sled. You can read each sensor and tell exactly what it is doing in real time. It will give you the same answer in minutes, that would take hours of screwing around like I said above. Here is a write-up on how to do the USB one, it'll cost you about $25. - Polaris RXL and Indy 500 EFI Select Monitor Software and Interface ? The Big Snow Page Be sure to get the FTDI version of TTL to USB, as it is one of the only ones that has the proper oddball baud rate that the sleds use.
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    16 - Axys 800 Switchback - Yeah, I had to get one of them!! http://www.polaris.com/en-us/snowmob...itchback-pro-s
    05 - Edge 800 Touring - Flying couch - SOLD
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    91 - 650 RXL SKS improved stock drag sled - Bastard Child

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    I actually had another look today. Loosened up the TPS and tried rotating it to see if made a difference. Sled bogs no matter what position the TPS is in. The only thing it a affected was the idle rpm and that was minimal. I down loaded the Select Monitor software, but have not yet sourced parts to make a cable. I guess thats my last hope.

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    Just ordered a cable from digikey.

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    Check to see If your sled has a fuel enrichment switch on it. This could also be feeding the ECU the wrong info if the switch has a bad connection or is disconnected. In the "off" position, the switch is closed, telling the ECU that it's business as usual. In the "on" position, the the switch is open and the current is rerouted through a resistor to "fake" the ECU into an thinking that it is much colder out and richening the mixture. The ambient temp sensor could've ohmed out just fine and is working properly but if the enrichment resistor is in the circuit, the ECU will richen the mixture

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    Quote Originally Posted by Badfish750 View Post
    Just ordered a cable from digikey .
    I'm having a similar issue in a '95 RXL. I just ordered the cable too and will download the program. I'm guessing my issue is a fuel regulator but I'm not sure. I do have a 2nd RXL that runs good so I could switch out parts if I need to. Someone got rid of my fuel enrichment switch and converted a handle bar or thumb heater switch to work the fuel pump. Not sure if that is messing things up, but it seemed to run ok the little I used it just before the issues.

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    No fuel enrichment on this sled.

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    Did you try the cable? I just got mine tonight. Downloaded the program, driver, but isn't working. The cable flashes a red led a few times and when I activate the select monitor program is says COM 3 so I'm assuming it is connecting with the cable but no values are present. I'm pretty sure I have the right connections (Black, Yellow, Orange) and they are connecting with the ecu adapter. Is there something I'm missing?

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    jajardas's Avatar
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    The sled has to be running. Hit connect, The light should go green and should tell you the chip. See picture for reference.
    Attached Images Attached Images  
    Currently at the Hobby House....
    1994 Polaris 440
    1997 Polaris INDY EFI 500
    1999 Indy 500 XC
    2006 Polaris Fusion 600HO
    2006 FST PROJECT
    2007 FST IQ
    2008 FST IQ LX
    3 Polaris MSX 140HO, 1999 Polaris SLX, 2001 Polaris Virage TXi
    2002 PolarisVirage TXi, 1999 X-45, 1997 SL1050

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    My seld was running and all the things lit up green but "0" for all values

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    Ugly_old_Poo_kid's Avatar
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    Was it set to the correct com port?

    Did the dot between the connect and disconnect buttons turn green?

    Was it set correctly to 500 or RXL?
    ---------------------------------------------

    16 - Axys 800 Switchback - Yeah, I had to get one of them!! http://www.polaris.com/en-us/snowmob...itchback-pro-s
    05 - Edge 800 Touring - Flying couch - SOLD
    03 - Edge 700 SKS - Warhead - in progress of another chassis rebuild.
    91 - 650 RXL SKS improved stock drag sled - Bastard Child

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