Question about 2003 Harley Davidson FXDWG Dyna Wide Glide

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Even after a 10 minute warmup in 70 degree weather; it will hicup every 30 seconds and seems to run better with a little choke. Bike idles fine and starts fine.

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Sorry but it's now all computer controlled. So, it's fuel injected! The Harley-Davidson ESPFI system is known as a Speed/Density, Open Loop, Sequential Port Fuel Injection system, that controls both fuel flow, and spark timing.

So the motor is cold, and you turn the ignition on, flip the start/run switch to run. The first thing you hear is the in-tank fuel pump pressurizing the fuel rail. If you listen real close, you'll hear the Idle Air Control (IAC) "stepping" into position. Even if you are real fast, the ECU already knows everything it needs to know from all of the sensors. You hit the starter button, the motor begins to crank over. The ECU sees the low RPM, and quickly goes to the Cranking fuel Table, increasing the Injector pulse width, allowing more fuel to get the motor started. At the same time, the ECU tells the IAC to open, allowing enough air into the motor for start and idle. (Throttle body blade is closed). The motor starts to run, and the ECU sees the higher RPM from the Crank Postition Sensor, and switches over to the Warm-Up Enrichment Table. This table eventually decays to nothing, as the motor comes up to full operating temperature. There's too much going on to put a finger on just one thing. Need to put it on a computer and have it checked out. Clear as mud, right! I've got a 1990 1200 FXR None of the above applies to mine.

Posted on Sep 15, 2010

  • rw1999monaco Sep 15, 2010

    I mentioned that a little choke helped and that should have eliminated any fuel injection answers. They have no chokes. But, thank you any way, now I understand FI a little better.

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Have you checked the carb boots for cracks or loose hardware? Also sounds like the lowspeed circuit on the carb or needle and seat could be dirty.

Posted on Sep 15, 2010

  • rw1999monaco Sep 15, 2010

    So far, I have just test rode the FXD. When I get it home, I intend to check for air leaks and if necessary; take the carb off and look for jet problems and dirt. Right now it is ok to ride for the rest of the fall up here in Maine. Thanks for responding.

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