Deceleration POP 2013 - 48
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Elite HDF Member
Joined: Nov 2012
Posts: 4,337
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From: Phoenix, AZ
Deceleration POP 2013 - 48
I bought my bike new and it has been a damn good running bike ever since however, recently I was going down the freeway at about 70+ and as I was coming up to heavier traffic I released the throttle and started deceleration that's when I noticed a loud backfire "POP" (Just one), Since then I have heard it pop occasionally always on deceleration and normally only one POP sometimes two and always on the freeway when speeds are over 65.
Bike history 2013 HD Forty-Eight Stage 1: Vance and Hines straight shot slip-ons, Screaming eagle Heavy Breather, Power Commander V (all added within the first 500 miles). I recently replaced the bikes battery, bike mileage is almost 10k
What could be causing this backfire? I only started hearing it not more than 300 miles ago?? Any help would be much appreciated.
Bike history 2013 HD Forty-Eight Stage 1: Vance and Hines straight shot slip-ons, Screaming eagle Heavy Breather, Power Commander V (all added within the first 500 miles). I recently replaced the bikes battery, bike mileage is almost 10k
What could be causing this backfire? I only started hearing it not more than 300 miles ago?? Any help would be much appreciated.
Cruiser
Joined: Jan 2014
Posts: 109
Likes: 7
From: Naperville, IL
You may have an intake/breather leak, try replacing the gasket between the breather and intake, they are usually just paper gaskets and they can go bad after some time. If that is not the problem then it is most likely a simple fuel mapping issue. It could also be a dirty air filter not letting enough oxygen/air into the combustion chamber. Popping = improper air/fuel ratio..
Last edited by partlowr; Apr 6, 2015 at 09:32 AM.
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Elite HDF Member
Joined: Nov 2012
Posts: 4,337
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From: Phoenix, AZ
When I changed out my battery, the battery was out of the bike for a few days, do you know if that could have wiped the map out of the Power Commander (not having any power going to it)?
Cruiser
Joined: Jan 2014
Posts: 109
Likes: 7
From: Naperville, IL
I guess anything is possible but I have used Power Commanders on my ATV and crotch rockets in the past and had batteries die over the winter and had no issues with losing my tune once I recharged or replaced the battery. A simple call to Dynojet or whomever made your PC would answer that question. Wouldn't hurt to rule that out I suppose. It is strange timing that this all occured when you replaced your battery.
Club Member
Joined: Feb 2007
Posts: 16,320
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From: Boynton Beach, FloriDuh
You may have an intake/breather leak, try replacing the gasket between the breather and intake, they are usually just paper gaskets and they can go bad after some time. If that is not the problem then it is most likely a simple fuel mapping issue. It could also be a dirty air filter not letting enough oxygen/air into the combustion chamber. Popping = improper air/fuel ratio..
Last edited by cHarley; Apr 6, 2015 at 11:01 AM.
Road Warrior
Joined: Jul 2013
Posts: 1,725
Likes: 193
From: South
The leak could also be between the mufflers and the bracket. There is a interconnect gasket there that can be used only once because it's very flimsy.
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Cruiser
Joined: Jan 2014
Posts: 109
Likes: 7
From: Naperville, IL
Decel pop is almost always caused by a lean A/F mixture. A leak between the air filter/breather is before the mixture is created and will not cause this problem. If an intake leak is the source of your problem, it would have to be between the throttle body and manifold or the manifold and heads.
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Club Member
Joined: Feb 2007
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From: Boynton Beach, FloriDuh
Good points and I would agree with you 100% if this were a carburated bike but this is not always the case on fuel injected vehicles. It depends where the leak is and if the MAF sensor is able or trying to compensate for the leak, that in itself can cause the computer to lean out the mixture if the MAF is not taking the proper reading. A pre-MAF intake leak can trigger a lean situation.
The TB/carb intake's purpose is to suck in air, the gasket you are referring to is there simply to prevent entry of dirt at the point of connection.
Cruiser
Joined: Jan 2014
Posts: 109
Likes: 7
From: Naperville, IL
I know I am a new guy on this forum and not out to be disruptive or make enemies and mean no disrespect but I have been racing motorcycles since I was 13 years old and now I build and race 1400hp cars with modern electronics, I am not just shooting from the cuff with my comments. I am just trying to help out another forum member.
Last edited by partlowr; Apr 6, 2015 at 12:35 PM.