Harley Davidson Forums

Loading


Hello

Guest

Welcome to the harley davidson forum. Join our discussion today for FREE!

CREATE ACCOUNT

Membership Benefits

Get your questions answered by harley davidson community gurus and industry experts. Exchange your experience with another members. Access full features forum. Get a members discounts for your harley parts & accessories.

Firing on one Cylinder

Electrical

Reply
 
Thread Tools Display Modes
Old Jul 29th, 2013, 05:04 PM     #1
Play The Throttle
Ride: 2009 Road King
 
173ABN's Avatar
 
Join Date: Jan 26th, 2009
Location: Naples Fl
Posts: 278
My Mood: My Mood
173ABN is an unknown quantity at this point
Firing on one Cylinder

My Chopper has a 1999 S&S 96CI engine and is only firing on the rear cylinder I have checked the plugs and the wires they are fine there is no fire coming from one side of the coil. The coil is a TwinTec single fire coil pn/2005 I am pretty good with the wrenches but not to good when it comes to the electrical side. Can a coil go bad on just one terminal? Any help would be great before I start spending $$$
__________________
Proud Vietnam Vet, Proud Patriot Guard Rider
173ABN is offline   Reply With Quote
Old Jul 29th, 2013, 05:19 PM     #2
Community Star
Ride: 1987 FXRS LOWRIDER
 
Apyle's Avatar
 
Join Date: Jan 26th, 2008
Location: Ithaca, MI
Posts: 543
My Mood: My Mood
Apyle is an unknown quantity at this point
Re: Firing on one Cylinder

I can't speak for a Harley coil, but I know it does happen on other waste spark coils. Such as the ones used on a gm v-6 engine, one tower cracks and leaks spark to ground.
__________________
Money can't buy happiness, but it sure can rent it for a while!
Apyle is offline   Reply With Quote
Old Jul 29th, 2013, 05:36 PM     #3
Account Removed
Ride: 2009 Dyna Low
 
Join Date: Aug 16th, 2009
Posts: 7,235
Hoople will become famous soon enoughHoople will become famous soon enough
Re: Firing on one Cylinder

Quote: Originally Posted by 173ABN View Post
Any help would be great
I assume this bike was running fine and it started to have this problem, and your not installing a new ignition system for the 1st time.

Yes, only one side of a single fire coil can be bad. Not the case with dual fire waste spark system. Since the 2005 is a single fire coil, it is two coils in one package. One side can be bad with other side being good..

As a test... What you can do is reverse both the secondary and primary sides to see if the problem is the coil or the ignition module that is driving it.

To do this,,,1st make a current diagram of what color wires are going where. Same with spark plug wires. Make a diagram

Now swap the two outside primary wires of the coil and leaving the middle terminal alone (that is the power lead).

Now swap spark plug wires in the coil output towers. (Pull both spark plug wires at coil and swap towers)

Start the engine. If the rear cylinder is still the only one that is working, the ECM or ignition module is the problem. But if the front cylinder now becomes the one that is working & the rear cylinder is the dead one,,, that tells you the coil is bad.
Hoople is offline   Reply With Quote
Old Jul 29th, 2013, 06:39 PM     #4
Warming The Wheels
Ride: 2006 Road King
 
Join Date: Feb 26th, 2012
Location: Riviera Beach MD
Posts: 82
xcavater is an unknown quantity at this point
Re: Firing on one Cylinder

This is similar to a problem a friend is having with his 2005 Springer. Is there a bench test for the ignition module?
xcavater is offline   Reply With Quote
Old Jul 29th, 2013, 08:41 PM     #5
Play The Throttle
Ride: 2009 Road King
 
173ABN's Avatar
 
Join Date: Jan 26th, 2009
Location: Naples Fl
Posts: 278
My Mood: My Mood
173ABN is an unknown quantity at this point
Re: Firing on one Cylinder

Ok guys did as Hoople advised switched the two leads coming into the coil left the two wires going to the spark plugs alone one is long and the other to short to reach the front cylinder. now I have fire to the front cylinder. My thought is that the coil is Ok because its now firing from the other tower looking at the ignition it is a Crane HI-4 single fire race Ignition with adjustment on it. I am hoping that is not the problem because its very $$$$$$$
__________________
Proud Vietnam Vet, Proud Patriot Guard Rider
173ABN is offline   Reply With Quote
Old Jul 29th, 2013, 09:03 PM     #6
Contributor
Ride: 2007 Streetbob
 
Jack Klarich's Avatar
 
Join Date: Sep 25th, 2009
Location: Jacksonville, Florida
Posts: 16,313
My Mood: My Mood
Jack Klarich has a spectacular aura aboutJack Klarich has a spectacular aura about
Re: Firing on one Cylinder

Quote: Originally Posted by 173ABN View Post
Ok guys did as Hoople advised switched the two leads coming into the coil left the two wires going to the spark plugs alone one is long and the other to short to reach the front cylinder. now I have fire to the front cylinder. My thought is that the coil is Ok because its now firing from the other tower looking at the ignition it is a Crane HI-4 single fire race Ignition with adjustment on it. I am hoping that is not the problem because its very $$$$$$$
That has separate pick ups for each cylinder, get a hold of Crane and see what hey are on Beach Street in Daytona, The Hi4 is a good system, I have seen lots of Dyna pick ups go bad but only a couple of cranes Crane Cams | Contact Us
__________________
CAPITAL JACK( Nuff Said, We're Burnin Daylight, Let's Ride)

Last edited by Jack Klarich; Jul 29th, 2013 at 09:05 PM. Reason: Added Link
Jack Klarich is offline   Reply With Quote
Old Jul 29th, 2013, 09:11 PM     #7
Start The Engine
Ride: 76 Shovelhead
 
Join Date: May 27th, 2013
Posts: 22
My Mood: My Mood
76_shovel is an unknown quantity at this point
Re: Firing on one Cylinder

Quote: Originally Posted by 173ABN View Post
Ok guys did as Hoople advised switched the two leads coming into the coil left the two wires going to the spark plugs alone one is long and the other to short to reach the front cylinder. now I have fire to the front cylinder.
My thought is that the coil is Ok because its now firing from the other tower looking at the ignition it is a Crane HI-4 single fire race Ignition with adjustment on it. I am hoping that is not the problem because its very $$$$$$$
IMO you are correct, by swapping the primary side wires you effectively "switched coils" and the side not firing is now firing so one would conclude the coil (both) are good.
aside from making sure wiring is intact I would next start thinking the ignition pickup was bad.
76_shovel is offline   Reply With Quote
Old Jul 29th, 2013, 09:18 PM     #8
Contributor
Ride: 2007 Streetbob
 
Jack Klarich's Avatar
 
Join Date: Sep 25th, 2009
Location: Jacksonville, Florida
Posts: 16,313
My Mood: My Mood
Jack Klarich has a spectacular aura aboutJack Klarich has a spectacular aura about
Re: Firing on one Cylinder

Harley Davidson Forums (Hi-4 single fire ignition) I do believe there is a trouble shooting here for the system
__________________
CAPITAL JACK( Nuff Said, We're Burnin Daylight, Let's Ride)
Jack Klarich is offline   Reply With Quote
Old Jul 30th, 2013, 07:39 AM     #9
Play The Throttle
Ride: 2009 Road King
 
173ABN's Avatar
 
Join Date: Jan 26th, 2009
Location: Naples Fl
Posts: 278
My Mood: My Mood
173ABN is an unknown quantity at this point
Re: Firing on one Cylinder

Unable to open
173ABN is offline   Reply With Quote
Old Jul 30th, 2013, 08:04 AM     #10
Contributor
Ride: 2008 Electra Glide
 
dbmg's Avatar
 
Join Date: Jul 4th, 2010
Posts: 4,231
My Mood: My Mood
dbmg will become famous soon enoughdbmg will become famous soon enough
Re: Firing on one Cylinder

Quote: Originally Posted by Jack Klarich View Post
Harley Davidson Forums (Hi-4 single fire ignition) I do believe there is a trouble shooting here for the system
Quote: Originally Posted by 173ABN View Post
Unable to open
Hey Jack unfortunately that link is broken......
__________________
Failure to plan on your part does NOT constitute an emergency on my part.
dbmg is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
front cylinder not firing rockman Touring Models 2 Jun 12th, 2010 08:26 PM
Back Cylinder Not Firing ! PaulMX Electrical 23 Jan 21st, 2010 08:34 PM
Front cylinder not firing bkrdr40 Engine, Fuel and Exhaust 18 Nov 22nd, 2009 01:29 AM
HELP!! Front cylinder not firing Bubbat450 Touring Models 3 May 24th, 2009 08:53 PM
Rear Cylinder not firing Wiedyk Electrical 8 Apr 18th, 2008 08:43 AM