Misfire
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6th Gear
Joined: May 2012
Posts: 14
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From: Connecticut
Misfire
I have a 04 RK Classic and have a problem that I cannot figure out. My bike misfires while riding and sputters. It is at random times and it is hard to diagnose. Sometimes it happens after a long ride and other times it happens as soon as I start riding. I have changed the plugs and wires, cleaned the throttle body and cleaned all the grounds. We tried to test the coil but really couldn't get a reading so I am not sure. I think the next step is to change the coil. Can anyone recommend a high performance coil? It seems Harley doesn't make the screamin eagle coil anymore.
If anyone has any other recommendations I would appreciate it.
Thanks in advance for your help
If anyone has any other recommendations I would appreciate it.
Thanks in advance for your help
not sure on the high performance coil, but definitely does sound like symptoms of a coil going bad. Good luck, hope you get it working!
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Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
be aware that cranking the motor with the plugs/wires etc not connected can blow your coil.
so you can start tying to find one problem, cause another ( blowing the coil), then find the initial problem still exists.
stock coils are good- the idea of a "performance coil" had more to do with points ignition systems- now that we have electronic ignitions just about any coil out-performs, outlasts the old "performance coil".
Crane cams makes good coils, I had them on my '95 ( when converted to dual fire), so you could check there.
you've been through you grounds, check as many connections as you can. also check you battery cables, I have seen the insulation wear partly through and the + cable short out on bumps.
you have already ruled out a hot/cold sensor situation, can you influence the problem by shaking or bouncing the bike
mike
so you can start tying to find one problem, cause another ( blowing the coil), then find the initial problem still exists.
stock coils are good- the idea of a "performance coil" had more to do with points ignition systems- now that we have electronic ignitions just about any coil out-performs, outlasts the old "performance coil".
Crane cams makes good coils, I had them on my '95 ( when converted to dual fire), so you could check there.
you've been through you grounds, check as many connections as you can. also check you battery cables, I have seen the insulation wear partly through and the + cable short out on bumps.
you have already ruled out a hot/cold sensor situation, can you influence the problem by shaking or bouncing the bike
mike
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
One suspect would be the TPS (throttle position sensor). Mine had random misfire issues as well as high-idle for a year, getting worse the last month or so. I changed the IAC, fuel-pressure regulator and all internal hoses, plug wires, and finally the TPS. It's been trouble-free now for a year. Voila!
Is your ECM throwing any codes?
Is your ECM throwing any codes?
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