Periodic engine misfire - help.
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Grand HDF Member
Joined: Oct 2010
Posts: 4,618
Likes: 290
From: Johnstown, PA
Periodic engine misfire - help.
I recently started to get a periodic misfire, it sounds like just air exiting the cylinder. I doesn't happen all the time, but when it does, it usually only happens after staring it cold, and only does it at take off.
It hasn't stalled out the bike until today, got the misfire and it shut off. She started right back up, and never missed again during this ride.
I have no codes, new spark plugs (last month to see if that was my issue) and I haven't done anything to the bike recently. I am looking for suggestions on what to look at.
See signature for my specs. - bike has 45K miles.
It hasn't stalled out the bike until today, got the misfire and it shut off. She started right back up, and never missed again during this ride.
I have no codes, new spark plugs (last month to see if that was my issue) and I haven't done anything to the bike recently. I am looking for suggestions on what to look at.
See signature for my specs. - bike has 45K miles.
Outstanding HDF Member
Joined: Oct 2009
Posts: 2,488
Likes: 30
From: Maryland near DC
maybe water in the tank....it could also be that sensor on the front of the motor...**** I can't remember the name right now...but it right near the oil filter and held in with a allen bolt...
Seasoned HDF Member
Joined: Apr 2012
Posts: 9,982
Likes: 5,220
From: Michigan
Your bike does that just to let you know that it is a Harley!
If it continues you need to start looking for the cause but for now you could add a little bit of Seafoam to your gas.
Just curious,have you had the intake gaskets checked or replaced?
Same for the cam chain adjusters?
If it continues you need to start looking for the cause but for now you could add a little bit of Seafoam to your gas.
Just curious,have you had the intake gaskets checked or replaced?
Same for the cam chain adjusters?
Thread Starter
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Grand HDF Member
Joined: Oct 2010
Posts: 4,618
Likes: 290
From: Johnstown, PA
Your bike does that just to let you know that it is a Harley!
If it continues you need to start looking for the cause but for now you could add a little bit of Seafoam to your gas.
Just curious,have you had the intake gaskets checked or replaced?
Same for the cam chain adjusters?
If it continues you need to start looking for the cause but for now you could add a little bit of Seafoam to your gas.
Just curious,have you had the intake gaskets checked or replaced?
Same for the cam chain adjusters?
Road Warrior
Joined: May 2009
Posts: 1,945
Likes: 4
From: Victoria, Australia
Crank Position Sensor. It basically tells the ignition when to fire the plugs.
I thought when they went bad they failed completely but not sure.
steelerdude-- have you checked your plug wires?
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Grand HDF Member
Joined: Oct 2010
Posts: 4,618
Likes: 290
From: Johnstown, PA
I checked them at the plugs, but can't get to them on the coil end, I think I will have to pull the tank to get to them.
Extreme HDF Member
Joined: Jun 2011
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From: Glendale AZ
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Seasoned HDF Member
Joined: Apr 2012
Posts: 9,982
Likes: 5,220
From: Michigan
If you don't have some mechanical ability and a lot of patience....pay someone who does!
I have "the" miss and sputter at constant speed under light acceleration/cruise that I cannot remedy.
The bike is going back to the shop as soon as they have an opening.
Last edited by 2AMGuy; Jul 19, 2012 at 09:26 PM.
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