FXDLI Snorts back through Air intake on startup
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Tourer
Joined: Aug 2011
Posts: 277
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From: kansas
FXDLI Snorts back through Air intake on startup
My Dyna does this about 50 to 60 percent of the time. Its a 2005 Dyna Low 1450 88. When I start it it will snort and back fire then start. Its fuel injected, has new nickel plugs and a new Duracell battery. Before I take it into the shop I was wondering if there was something simple to look at. Thanks for any help. One of the times it sent a small burp of white smoke out the air intake.
Supporter
Joined: Jan 2007
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From: along the shore of Mishigami
The fuel injection systems on that year were pretty basic, by todays standards. If you have some miles on it maybe run some sea foam in a fresh tank of gas, the injectors could be clogged. The crank position sensor triggers the firing of the ECM to coil to plugs, high miles and the sensor goes out. One more stab at this, if you are releasing the start button too soon, there may be a kickback on start. May carb bike does this if I get a little anxious on the start. Good luck.
Road Warrior
Joined: May 2005
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From: Minden LA
My Dyna does this about 50 to 60 percent of the time. Its a 2005 Dyna Low 1450 88. When I start it it will snort and back fire then start. Its fuel injected, has new nickel plugs and a new Duracell battery. Before I take it into the shop I was wondering if there was something simple to look at. Thanks for any help. One of the times it sent a small burp of white smoke out the air intake.
Outstanding HDF Member
Joined: Dec 2012
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From: Texas
Seafoam is another snake-oil fuel additive rumored to neutralize old fuel and clean fouled injectors. I don't use the stuff except when I think I may have water contaminated fuel because it does bind to the water molecules and burns through. I have used all the different fuel system additives but I never found any of it to be useful poured into the tank.
You really shouldn't need to run any of that stuff to clean injectors unless you are running too rich or dirty and fouling them out. Sitting for 90 days or so with fuel in the tank should not cause any issues, and fuel in the system for that short of a period of time definitely should not foul the injectors. The only real way to clean injectors is to take them out and clean and pressure check them and check the spray pattern.
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Tourer
Joined: Aug 2011
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From: kansas
The previous owner put on one of those computer modules that optimizes the timing. its called a dynojet. Maybe that is causing some problem.
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Seasoned HDF Member
Joined: Jul 2008
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From: southeast PA
You can also remove it and see if the issues are still there. If not, either the unit is bad or just needs to be adjusted. Those piggyback things are prone to getting wet and acting badly. Did you just wash it or ride in a heavy rain? Check the connector and make sure it's dry and tight.
Also, you mentioned nickel plugs. Not exactly sure what you mean, but pull them and take a look. Try a set of stock plugs.
These are all simple things you can do on your own, before you have to spend money taking it to a shop.
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Thread Starter
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Tourer
Joined: Aug 2011
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From: kansas
Well I pulled the plugs, first plug was fine, a bit gray but clean, second plug front jug was black carbon built up. It was hard carbon black build up. Not sure what would cause that.I will get a new set of NGKs and put them in.
My scoot started doing the same thing when cold, seemed to go away as it warmed up. Suggest you try cleaning the IAC sensor with some carb cleaner, read about it on this forum (https://www.hdforums.com/forum/touri...like-crap.html), 10 minute job, bike runs great now. If you never have cleaned it I would put my money on a dirty IAC. Good luck.
Last edited by Low_Wider; Oct 27, 2015 at 08:23 PM. Reason: added link