Front cylinder not firing
Thread Starter
|
3rd Gear
Joined: Jan 2019
Posts: 7
Likes: 0
From: Brisbane Australia
Front cylinder not firing
Hi all
This has possibly been post 100 times over but nothing I have seen elsewhere is of any value. To start with I have a 94 FLSTF and upgraded to Crane Hi 4 module about 30K back and it has started intermittently dropping the front cylinder. Time for plugs and leads so it got them, still the same, tested single fire coil good resistance both sides, so thought it must be module so it just got a new Mid-USA module, still the same. To double check the coil I transferred the firing wire and lead to the bottom coil (rear cylinder) which I had spark from and nothing but now I have spark on the top coil (Front cylinder) but with the rear firing wire from module to it. I have just stopped for a couple of beers coz this is doing my head in, I hope I have not just bought a dud new module or am I wrong with the diagnosis of the coil. I got about 4 ohms on both coils.
This has possibly been post 100 times over but nothing I have seen elsewhere is of any value. To start with I have a 94 FLSTF and upgraded to Crane Hi 4 module about 30K back and it has started intermittently dropping the front cylinder. Time for plugs and leads so it got them, still the same, tested single fire coil good resistance both sides, so thought it must be module so it just got a new Mid-USA module, still the same. To double check the coil I transferred the firing wire and lead to the bottom coil (rear cylinder) which I had spark from and nothing but now I have spark on the top coil (Front cylinder) but with the rear firing wire from module to it. I have just stopped for a couple of beers coz this is doing my head in, I hope I have not just bought a dud new module or am I wrong with the diagnosis of the coil. I got about 4 ohms on both coils.
Road Master
Joined: Jun 2018
Posts: 760
Likes: 369
From: Winnipeg
Yeah- i got the same problem on my 92 with a hi4(crane). Specs say they want a coil 2-4 ohms- and coils 4 ohms and more can be used- but is not optimal. At this point- like the previous poster stated- id suspect a bad coil. I know it sucks to just replace parts- but sometimes its gotta be done. Maybe you can borrow a good known coil from a buddy to try first?
Thread Starter
|
3rd Gear
Joined: Jan 2019
Posts: 7
Likes: 0
From: Brisbane Australia
Thanks Dave I think that a new coil is the next logical step but I am also now suspect of voltage drop with the 12v supply to it, just a theory.
This should have said "thanks all", not often the ol' girl chucks a fault I can't fix but this is a bit different. Will report back when it's firing on 2 again.
This should have said "thanks all", not often the ol' girl chucks a fault I can't fix but this is a bit different. Will report back when it's firing on 2 again.
Last edited by Puzzell; Jan 26, 2019 at 04:15 PM.
Tourer
Joined: Mar 2009
Posts: 410
Likes: 127
From: Iowa
https://www.hdforums.com/forum/evo-c...-cylinder.html
Forum member Ihgdale had the same problem and replaced lots of parts, including plugs, plug wires, coil, and the cam sensor with the brown goo, but the thread ended Nov. 5th with no resolution.
Maybe he'll pop back in and let us know if he ever got it fixed.
Trending Topics
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Hi all
This has possibly been post 100 times over but nothing I have seen elsewhere is of any value. To start with I have a 94 FLSTF and upgraded to Crane Hi 4 module about 30K back and it has started intermittently dropping the front cylinder. Time for plugs and leads so it got them, still the same, tested single fire coil good resistance both sides, so thought it must be module so it just got a new Mid-USA module, still the same. To double check the coil I transferred the firing wire and lead to the bottom coil (rear cylinder) which I had spark from and nothing but now I have spark on the top coil (Front cylinder) but with the rear firing wire from module to it. I have just stopped for a couple of beers coz this is doing my head in, I hope I have not just bought a dud new module or am I wrong with the diagnosis of the coil. I got about 4 ohms on both coils.
This has possibly been post 100 times over but nothing I have seen elsewhere is of any value. To start with I have a 94 FLSTF and upgraded to Crane Hi 4 module about 30K back and it has started intermittently dropping the front cylinder. Time for plugs and leads so it got them, still the same, tested single fire coil good resistance both sides, so thought it must be module so it just got a new Mid-USA module, still the same. To double check the coil I transferred the firing wire and lead to the bottom coil (rear cylinder) which I had spark from and nothing but now I have spark on the top coil (Front cylinder) but with the rear firing wire from module to it. I have just stopped for a couple of beers coz this is doing my head in, I hope I have not just bought a dud new module or am I wrong with the diagnosis of the coil. I got about 4 ohms on both coils.
If you replace the coil get a good one not the cheapest you can find...JMO
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
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
Road Captain
Joined: Apr 2009
Posts: 501
Likes: 150
From: Jersey
I've been running a Crane HI4 with Cranes single fire coil pack for almost 20 years and 50K with no issues. I would suggest you match the parts, if you can still get a Crane coil I would go that route.
Thread Starter
|
3rd Gear
Joined: Jan 2019
Posts: 7
Likes: 0
From: Brisbane Australia
Also a good quick test for the module is to use a test light to test each control wire to the coil, the light should flash when running or cranking, mine did on the rear pot but just stayed on solid on the front.
Last edited by Puzzell; Feb 8, 2019 at 05:55 AM.