Backfire during hot start?
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Intermediate
Joined: Aug 2009
Posts: 42
Likes: 0
Backfire during hot start?
Odd thing started...2009 Streetglide, stock engine, stock pipes, stock air cleaner, 14000 miles. I ride to work each day 50 miles each way. When I start her in the mornng fires right up, runs fine. Afternoon I get on her to go home starts fine, runs great, no issue, gets pretty warm in Houston this time of year especially in stop and go traffic . Get near home and stop to gas up for the next few days commute and when I hit the starter it is like a short backfire, really more like a pop or cough. Doesn't start so I back off the starter, hit it again and it fires right up, runs fine, starts fine in the morning again. Anyone experience this on hot starts? Potential problem or just her personality? No grinding or ugly noises.
Grand HDF Member
Joined: Jan 2012
Posts: 4,445
Likes: 2,818
From: Oklahoma
I occasionally get the same thing with my 08 Road King. Many people have this happen and the easy work around is to NOT wait for the fuel pump to stop before hitting the starter, turn the switch, hit the starter. About 95% of the time I get a clean start dong that, every now and then, it acts the same way as waiting for the pump to stop. I pulled my air cleaner to look inside the intake after the pump ran and I see just a bit of fuel vapor. I suspect a slightly "weepy" fuel injector, but not bad enough to replace for the time being. This is for the hot start only since the cold starts are normal.
Road Warrior
Joined: Jun 2009
Posts: 1,943
Likes: 3
From: NYC
you might have excessive carbon build up which may be causing pre-detination. I recently pulled the heads on an 07 ultra with 11K and was shock how much carbon build up was in there....surprised the bike even ran.
6th Gear
Joined: Aug 2010
Posts: 13
Likes: 0
backfire
my 09 streetglide has been doing the same as yours but mine as a pv tuner on it so i thought it had lost it map, it also acted like it wasn't turning over fast enough so I replaced the battery and it cranks up great now no more back firing when cranking it up when it warm. Larry
6th Gear
Joined: Aug 2009
Posts: 12
Likes: 3
this work around worked for me !! I have a 2008 Fatboy Does someone knows what would be a permanent solution ? what is the cause of this issue ?
Air filter is new, Spark plugs are new.
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Grand HDF Member
Joined: Jan 2012
Posts: 4,445
Likes: 2,818
From: Oklahoma
My experience matches LarryF above. With a new battery, the machine starts the same way cold or hot. A new battery seems to "cure" many minor ills.
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Seasoned HDF Member
Joined: Jan 2013
Posts: 10,637
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From: Lake, Ms
How many times when you start your car or truck do you turn the key on and wait for the fuel pump to prime? I'm guessing never. Never made sense why folks are taught to do this on their bikes.
