Faulty Ignition Coil / Computer Module
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4th Gear
Joined: Oct 2005
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Faulty Ignition Coil / Computer Module
I have an 89 Evo with the standard ignition coil and a Screamin Eagle control module.
On a recent long trip the ignition system died intermitently between 60-70 mph (even the rev counter stopped) to give a jerky stop/start ride but "fixed" itself after 5-10 minutes. The problem has not occured recently.
I tried to set the timing using an induction type strobe light (a sensor is attached to the outside of the spark leads to get the timing). I can only pick up a signal on the lead going to the rear cylinder. Both plugs are sparking and the problem persists if I change the leads around (so it is not the leads). I started to test as per the manual but most tests require HD's "special" multimeter. The bike fires up OK.
Any ideas what could be wrong?
Im assuming that the strobe light should pick up a pulse from both leads?
What is likely to be causing the problem and what simple tests can be done?
Thanks in advance for any suggestions
On a recent long trip the ignition system died intermitently between 60-70 mph (even the rev counter stopped) to give a jerky stop/start ride but "fixed" itself after 5-10 minutes. The problem has not occured recently.
I tried to set the timing using an induction type strobe light (a sensor is attached to the outside of the spark leads to get the timing). I can only pick up a signal on the lead going to the rear cylinder. Both plugs are sparking and the problem persists if I change the leads around (so it is not the leads). I started to test as per the manual but most tests require HD's "special" multimeter. The bike fires up OK.
Any ideas what could be wrong?
Im assuming that the strobe light should pick up a pulse from both leads?
What is likely to be causing the problem and what simple tests can be done?
Thanks in advance for any suggestions
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4th Gear
Joined: Oct 2005
Posts: 8
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RE: Faulty Ignition Coil / Computer Module
Folks,
A quick update on the ignition / module etc.
I checked with the service department of the local HD distributor who were not able to advise if the timing light should work off both leads. Not surprisingly they follow the manual and do the timing on the front cylinder and have no need to look at the back cylinder. I also checked the Ignition / Module operation on a friends '95 evo and discovered that the induction timing light only works on one spark lead and not both like mine - ergo this is normal.
As for the timing; I checked the timing with the leads going to either spark plug and the induction light running off the front and back cylinder. This made no difference to the timing which I guess is to be expected from a single pin twin (ie both cylinders are at TDC at the same time).
A quick update on the ignition / module etc.
I checked with the service department of the local HD distributor who were not able to advise if the timing light should work off both leads. Not surprisingly they follow the manual and do the timing on the front cylinder and have no need to look at the back cylinder. I also checked the Ignition / Module operation on a friends '95 evo and discovered that the induction timing light only works on one spark lead and not both like mine - ergo this is normal.
As for the timing; I checked the timing with the leads going to either spark plug and the induction light running off the front and back cylinder. This made no difference to the timing which I guess is to be expected from a single pin twin (ie both cylinders are at TDC at the same time).
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RE: Faulty Ignition Coil / Computer Module
Check the connector that screws together (the one from the ignition plate to the harness) They are very prone to having poor connections over time. It's a black connector that screws together - male in one side - female in the other. Most times they need to be replaced.
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