Question about Harley Davidson FXDWG Dyna Wide Glide Motorcycles
I am working on a 2008 FXDUI My customer brought it in stating it would not run right or stay running. The unit had been sitting for over a year with no fuel stabilizer. We took the pump out and checked and found a nasty fuel filter we replaced the filter & fuel and got it running but it is hard to start and keep running it does not like to idle and seems like the it is only partially running on the rear cylinder. Sometimes it will idle fine for a minute or so then it will backfire and die. Sometimes it will start right back up and sometimes you have to keep trying and eventually it will start up again but won't stay running at idle. If you can get it warmed up enough to ride it backfires at partial throttle until it gets some rpms. It does not like to stay idling and take throttle. I took it out for a ride and it runs great down the highway no problems at 80 +. but when you come in to town it wants to die at idle especially once warmed up. I have had the fuel injectors cleaned and tested, it had a Vance and Hines fuel pack on it and we remapped it and it ran a little better but still had the idle issue. We took the fuel pack off and it still has the same problem. I have swapped O2 sensors from front to back and it still does the same on the rear cylinder. I have replaced the tps because it had a spike in the resistance readings at 5/8 throttle. It still runs the same after replacing the tps. I checked spark on both cylinders while it is running and they both fire consistently. I have even swapped the coil no change. We pulled the cps out and checked it for debris or damage and found none. It never displays a check engine light other than a key on systems check. Please help
How could you possibly clean the fuel injectors???? OR test them??? what would you test??? Flow??? I do not know how you would do that either. You could check for a leaky fuel injector but I would be very interested in what you mean when you say you have tested the injectors. Please post a comment. So, you know that all fuel stabilizers that I know of do not stabilize gasoline but only ethanol and you should be running a premium high test fuel that would not contain ethanol. Gasoline will deteriorate over time if oxygen is present so always store a bike with the fuel tank fully topped up with premium high grade fuel to lessen the chances and effect of fuel deterioration. Did you empty the fuel tank and refill with fresh premium high test fuel. Did you install new plugs??? Did you do a running fuel pressure test??? Did you do a running battery voltage test and have running voltage of 11 VDC minimum or higher??? Bad plugs, low fuel pressure, low fuel flow, plugged air filter, plugged exhaust will not set a dtc. Is there a mouse nest in the induction or exhaust system. Is there possibly an intake leak??? This van be very important?? Did you do a coil resistance etc check?? The more information you provide the better. Just off the top of my mind if the plugs are new and there is no rodent plugging of intake or exhaust system I would test running fuel pressure and then replace with a new or known good set of injectors as my starting point.
Posted on Nov 14, 2014
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Posted on Jan 02, 2017
Just a hunch, had this happen to a bike of mine years ago, could be the piston rings are gettting ready to go(wore down). What happens is when the quad is cold the rings expand tight into the cylinder walls allowing it to get full compression and run ok. When it heats up they shrink allowing the slightest amount of give which in turn will cause you problems similar to what your describing.
Posted on Jun 10, 2009
SOURCE: Hi, I have a 2002
Only one thing can make this bike run rich - an failure of the air mass flow sensor: if the sensor reports that more air than what is actually coming gets in the engine the ECU will make the injectors pump more fuel which will make the mixture rich. If an injector has slightly bigger tolerances than the norm then it will deliver slightly more fuel than a normal one - this could make the mixture go too rich to light up and the engine will run without that cylinder: this is what's happening in your case.
You must replace the air mass flow sensor - it was already reported as failing by the ECU - now it has failed for good.
You will have to replace the fuel pump also - if it draws so much power that it triggers a failure warning then it's completely worn out.
Posted on Apr 25, 2011
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