Engine cuts off when riding
Thread Starter
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Stage III
Joined: Sep 2023
Posts: 3
Likes: 2
From: Montreal
Engine cuts off when riding
Hi, I own a Dyna superglide FXD 2002 which issue is weird. When hot, after a couple of miles, the engine stalls. It will restart with difficulty if it does.
If I let the bike cool down for 8 hours, it will start easily. When it happens, there's no spark s at the plugs.
here's what I replaced: plugs, cables, ignition coil, crank sensor, ignition module, battery.
A brand new Dynatek module (adjustable advance and rpm) just won't work on my motorcycle, whatever the advance I select.
The carb is fine, the gas tank cap is vented.
IT is the first summer it happens, after 10 years of running good.
intermittent electrical issues are just a hassle (to remain.polite)
If I let the bike cool down for 8 hours, it will start easily. When it happens, there's no spark s at the plugs.
here's what I replaced: plugs, cables, ignition coil, crank sensor, ignition module, battery.
A brand new Dynatek module (adjustable advance and rpm) just won't work on my motorcycle, whatever the advance I select.
The carb is fine, the gas tank cap is vented.
IT is the first summer it happens, after 10 years of running good.
intermittent electrical issues are just a hassle (to remain.polite)
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,065
Likes: 11,084
From: San Diego, CA
Hi, I own a Dyna superglide FXD 2002 which issue is weird. When hot, after a couple of miles, the engine stalls. It will restart with difficulty if it does.
If I let the bike cool down for 8 hours, it will start easily. When it happens, there's no spark s at the plugs.
here's what I replaced: plugs, cables, ignition coil, crank sensor, ignition module, battery.
A brand new Dynatek module (adjustable advance and rpm) just won't work on my motorcycle, whatever the advance I select.
The carb is fine, the gas tank cap is vented.
IT is the first summer it happens, after 10 years of running good.
intermittent electrical issues are just a hassle (to remain.polite)
Otherwise, it could be the MAP sensor....
https://www.harley-davidson.com/us/e...8c76d62381aa/y
I'd check the MAP sensor for good wiring/connection and/or a leak at the MAP sensor seal... There is a way to test the sensor, but I forget how, and it can be problematic if it is an intermittent problem.
Some electrical sensors will have intermittent issues, when they get hot, prior to failure..
https://cv-performance.com/cv-perfor...nd-replacement
Last edited by hattitude; Oct 4, 2023 at 06:38 PM.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
This post would get more replies in the Tech/Mechanical section under the Engine/Mechanical topics.
First thing that comes to mind is the MCB; main circuit breaker. IIRC, the early models were equipped with a 40A CB which was upgraded to a 50A in later models; I forget which years. The CB heats up and will shut the bike down; wait a while for cool down and she will start up again. Not saying that's your problem but worth checking out.
I don't know why the Dyantek igniton won't work; doesn't sound right. I ran a Daytona Twin Tec on my 02 FLHT with no issues.
First thing that comes to mind is the MCB; main circuit breaker. IIRC, the early models were equipped with a 40A CB which was upgraded to a 50A in later models; I forget which years. The CB heats up and will shut the bike down; wait a while for cool down and she will start up again. Not saying that's your problem but worth checking out.
I don't know why the Dyantek igniton won't work; doesn't sound right. I ran a Daytona Twin Tec on my 02 FLHT with no issues.
Thread Starter
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Stage III
Joined: Sep 2023
Posts: 3
Likes: 2
From: Montreal
Issue solved
Gee I was lucky today, went for a ride in the neighbourhood and luckyly the engine went dead in front of my garage (50 feet max). I checked all voltages and saw that the middle pin of the harness to the ignition coil measured only 1.9V to gnd. The wire to the middle pin of the coil primary comes from the kill switch, which supply the 12V to the coil, when the switch is on. For a reason that I will discover tomorrow, this.wire has a loose connection somewhere on it's return.path. I ran a new wire from the battery straight to the coil.
Engine started right away.
I spent one thou in different parts to clear the issue.
It would have cost me easily the same in a garage, just for labour. Anyway, now I know my bike a bit more....hey hey.
THANKS for your replies.
Colas, Montreal.
Engine started right away.
I spent one thou in different parts to clear the issue.
It would have cost me easily the same in a garage, just for labour. Anyway, now I know my bike a bit more....hey hey.
THANKS for your replies.
Colas, Montreal.
Seasoned HDF Member
Joined: Mar 2021
Posts: 17,894
Likes: 3,551
From: backwoods
I would follow the pins. Maybe when installing new parts, it got misaligned. This happened to me when replacing CPK.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,065
Likes: 11,084
From: San Diego, CA
Gee I was lucky today, went for a ride in the neighbourhood and luckyly the engine went dead in front of my garage (50 feet max). I checked all voltages and saw that the middle pin of the harness to the ignition coil measured only 1.9V to gnd. The wire to the middle pin of the coil primary comes from the kill switch, which supply the 12V to the coil, when the switch is on. For a reason that I will discover tomorrow, this.wire has a loose connection somewhere on it's return.path. I ran a new wire from the battery straight to the coil.
Engine started right away.
I spent one thou in different parts to clear the issue.
It would have cost me easily the same in a garage, just for labour. Anyway, now I know my bike a bit more....hey hey.
THANKS for your replies.
Colas, Montreal.
Engine started right away.
I spent one thou in different parts to clear the issue.
It would have cost me easily the same in a garage, just for labour. Anyway, now I know my bike a bit more....hey hey.
THANKS for your replies.
Colas, Montreal.
I find it best to actually diagnose the problem and know it's fixed, than to guess, throw parts at a problem, and hope it's fixed...
You've just become your own best mechanic...
Enjoy the bike....
Last edited by hattitude; Oct 5, 2023 at 09:48 AM.
Thread Starter
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Stage III
Joined: Sep 2023
Posts: 3
Likes: 2
From: Montreal
Yep you're right about the parts. An intermittent electrical issue is hard to diagnose and when the problem appears, one has to rush to have access to tools and used parts trying to find the cause of it,
screening Internet and shop manual b4 the problem disappears again...
thanks for your comment
Colas
..
screening Internet and shop manual b4 the problem disappears again...
thanks for your comment
Colas
..
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