Question about Harley Davidson FXDWG Dyna Wide Glide Motorcycles

1 Answer

Starts when could doesn't like to idle

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

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Harley Davidson Master
  • 3,506 Answers

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


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Engine dies after quad is warmed up (10-15 minutes)

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

  • 202 Answers

SOURCE: Oil/fuel mixture in carberutor when disassembled

Is the timimg correct. check your timing if it is correct.

Posted on Dec 13, 2009

  • 13 Answers

SOURCE: 1998 Arctic Cat ZR 600 Snowmobile dies out

air adjustment

Posted on Apr 18, 2010

  • 11800 Answers

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

  • 1140 Answers

SOURCE: 02 sensor on top of

try to find connector and plug it up

Posted on Jul 10, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Truck starts but won't idle. If I stay on the gas pedal it will keep running untell it warms up if I turn lights or heater on it dies right away also please help

Need help: Truck starts but wont stay running?? - > ... > Technical / Maintenance
Jun 19, 2005 - 17 posts - ‎9 authors The truck will start but then die right out. I can do this all day long with the same effect. I can however keep it running by feathering the throttle. if ...

Truck starts but won't stay running...?? - Dodge Dakota Forum

Nov 30, 2015 | Cars & Trucks

1 Answer

Why motorcycle starts but only stays running when I open throttle?

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
Bike starts up idles on choke dies with choke off our when warm
Yamaha XVS13AWC Service Manual
OEM parts for Yamaha
Yamaha XVS13AW Owner Manual

May 06, 2014 | 2008 Yamaha V Star 1300 Tourer

2 Answers

Wont run right

follow the cable from the start to finish it might have been bent or damaged. then have a look at the carbs they might have been damaged in the two accidents if the mix is wrong or they are letting in air

Apr 20, 2014 | 2004 Honda VT 750 Shadow Aero

1 Answer

Idling problem

you stated the bad , but what is the good.
can it be driven? with full power.
your car has no year? and if working engine,? what engine? option
ever get a 60,000 mile tune up this decade? (just old spark plugs do this)
you start the cold engine/
can you keep it running, with a fast right foot action?
starts after 5min, then runs perfect all day???????

my guess, is one more missed tune up.

Feb 23, 2014 | Toyota Quantum Cars & Trucks

1 Answer

2002 ford ecort starts but doesnt stay running

are there any codes. sound like a bad throthle position sensor or a idle air control valve

Dec 06, 2012 | 2002 Ford Escort

2 Answers

2002 jeep grand Cherokee change batt. Now it starts but won't run?

Because you disconnected the battery you lost the long trim value,you will now have to relearn the idle,start the vehicle idle it to 1500 RPM,hold for a minute,idle should stabilize,turn on A/C let it idle,for a minute,now your done,

Aug 19, 2012 | 2002 Jeep Grand Cherokee

1 Answer

Carbs were removed and cleaned. now starts hard and does not idle

sounds like carbs not cleaned right, oh try changing fuel filter, does fuel pump run constantly. if you cant hear it you can feel it, up behind the ignition. Berrymans B12 fuel additive works wonders. double dose add to gas run bike til hot then let stand overnight, pray a lot and try it again.
here is a free pdf service manual too

thats mine

Mar 30, 2009 | 1999 Yamaha V Star Custom

1 Answer


IF IT RUNS AND STAYS running. then that means the car is flooding or is in a sad state of tune.
tune it up and it will start every time.

if not ask me here.
see my guest book. ask a question.

1; tune up
2: bad ECT sensor.
3: stuck closed IAC.
my page answers all sidekick questions.

Feb 04, 2009 | 1992 Geo Tracker

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

154 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4821 Answers


Level 3 Expert

4348 Answers


Level 3 Expert

79077 Answers

Are you a Harley Davidson Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides