2012 dyna misfiring
Thread Starter
|
3rd Gear
Joined: Mar 2017
Posts: 7
Likes: 0
From: Georgia
2012 dyna misfiring
I recently purchased a used 2012 dyna street bob with 5,000 miles, had the dealers but vance and Hines short shots on it with screaming eagle breather on it. Now the problem is that it seems to be misfiring when I am just cruising in the lower rpm range (2300-2600). And I'm not 100% sure what the issue is? Help plz
Seasoned HDF Member
Joined: Dec 2009
Posts: 9,165
Likes: 1,910
From: Doghouse... mostly
You either need a Tuner to Dyno the bike and/or you also need a fuel management device a.k.a. a tuner, like a PowerVision unit, so he can do it properly . You can also purchase a FuelPak 3 and try doing it your self.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,148
Likes: 6,170
From: SE Michigan
Not even sure where to begin with that answer. There is zero basis for advice that adding a tuner to a misfiring bike will solve the problem, if it is in fact misfiring.
Some diagnosis is required. Could be wiring, a sensor, fuel pump, tons of stuff.
If you can't diagnose it yourself, and it is very reproducible, take it to a dealer and see what they say.
The actual resolution may be cheaper or more expensive than a tuner, but at least you wont own a tuner you dont need.
It is possible that what you perceive as misfiring is actually a surging affect if a bike is running too lean.
Adding a fuel management solution of some type would help this, but despite a lot of mythology on the forums, the ECM can adjust to a stage 1 setup.
If it turns out that a fuel management system is necessary, there are inexpensive options. Fuel Moto Microtuner is $199. Nightrider VIEDS is another inexpensive option
Whatever you do, dont let the dealer talk you into the stage 1 download, its a waste of money, and a Microtuner will cost you roughtly the same for a lot more flexibility and better results.
Some diagnosis is required. Could be wiring, a sensor, fuel pump, tons of stuff.
If you can't diagnose it yourself, and it is very reproducible, take it to a dealer and see what they say.
The actual resolution may be cheaper or more expensive than a tuner, but at least you wont own a tuner you dont need.
It is possible that what you perceive as misfiring is actually a surging affect if a bike is running too lean.
Adding a fuel management solution of some type would help this, but despite a lot of mythology on the forums, the ECM can adjust to a stage 1 setup.
If it turns out that a fuel management system is necessary, there are inexpensive options. Fuel Moto Microtuner is $199. Nightrider VIEDS is another inexpensive option
Whatever you do, dont let the dealer talk you into the stage 1 download, its a waste of money, and a Microtuner will cost you roughtly the same for a lot more flexibility and better results.
Last edited by Keithhu; Mar 9, 2017 at 05:16 AM.
Road Master
Joined: Jan 2017
Posts: 1,129
Likes: 505
From: Illinois
Hey Cody, welcome to the forum.
As it was said, you need a tuner. In the old days you would just replace the needles in the carb to match your setup and be done. With Fuel Injection you need a tool to make changes to the computer which manages your fuel. This tool is the "tuner".
I just added the Vance & Hines FP3 to my bike and highly recommend it. It will solve your problems as it did for me and it is extremely simple to install and use. The best part is that it connects to your smart phone via bluetooth so you get live data as you ride such as voltage, temperature, torque, and a whole bunch more. Great stuff to have.
One other thing that might cause what you call misfiring is a leak in your exhaust. Make sure that you torque the clamp bolt to specs or you will have a leak.
As it was said, you need a tuner. In the old days you would just replace the needles in the carb to match your setup and be done. With Fuel Injection you need a tool to make changes to the computer which manages your fuel. This tool is the "tuner".
I just added the Vance & Hines FP3 to my bike and highly recommend it. It will solve your problems as it did for me and it is extremely simple to install and use. The best part is that it connects to your smart phone via bluetooth so you get live data as you ride such as voltage, temperature, torque, and a whole bunch more. Great stuff to have.
One other thing that might cause what you call misfiring is a leak in your exhaust. Make sure that you torque the clamp bolt to specs or you will have a leak.
Thread Starter
|
3rd Gear
Joined: Mar 2017
Posts: 7
Likes: 0
From: Georgia
I called the HD dealership I got the bike from and told them what was going on they said that the ecu was supposed to be flashed or adjusted to the spec that it needed to be for the air intake and exhaust it has on it now. And he said they may have forgotten to do it when they installed the exhaust. So would I still need a fuel tuner or would them flashing or adjusting the ecu be enough?
And thanks for all the responses I appreciate it alot
And thanks for all the responses I appreciate it alot
Trending Topics
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,148
Likes: 6,170
From: SE Michigan
I called the HD dealership I got the bike from and told them what was going on they said that the ecu was supposed to be flashed or adjusted to the spec that it needed to be for the air intake and exhaust it has on it now. And he said they may have forgotten to do it when they installed the exhaust. So would I still need a fuel tuner or would them flashing or adjusting the ecu be enough?
And thanks for all the responses I appreciate it alot
And thanks for all the responses I appreciate it alot
If they want to charge you additional money for the stage 1 flash (often referred to as the "dealer download"), decline and call Fuel Moto. If they have already charged you for it, get a refund, then call Fuel Moto
Last edited by Keithhu; Mar 9, 2017 at 11:47 AM.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Grand HDF Member
Joined: Jun 2013
Posts: 4,998
Likes: 875
From: Iowa
If they are going to flash it for free with the upgrade I'd say give it a try. Misfiring can be from running too lean, a plug, plug wires, spark timing, bad exhaust seal, O2 sensor going bad.....
Extreme HDF Member
Joined: May 2010
Posts: 11,166
Likes: 1,801
From: Puget Sound, WA.
Going to a stage 1 mod definitely affects lean/rich on the bike.
Besides pipes, did they change the air cleaner?
What tuner does it have now? Screaming Eagle?
Check codes too-
https://www.hdforums.com/forum/ignit...-injection-55/
Besides pipes, did they change the air cleaner?
What tuner does it have now? Screaming Eagle?
Check codes too-
https://www.hdforums.com/forum/ignit...-injection-55/