No Spark on rear cylinder
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Joined: Jul 2018
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From: Ireland
No Spark on rear cylinder
hi all new to this
had a question, I have a 1998 harley flhtci 1340 with 8000 miles. She stopped sparking rear cylinder and I replace the dual fire coil with a stock part and still no. Spark, it's not the coil, plugs or leads. Could it be cam sensor and is there a way to test this before I waste more money as with the new coil.
Your help appreciated
had a question, I have a 1998 harley flhtci 1340 with 8000 miles. She stopped sparking rear cylinder and I replace the dual fire coil with a stock part and still no. Spark, it's not the coil, plugs or leads. Could it be cam sensor and is there a way to test this before I waste more money as with the new coil.
Your help appreciated
Grand HDF Member
Joined: May 2014
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From: florida
post up a picture of your coil, i don't have access to a factory manual for your year bike,,according to what i can look up your bike is MM injected, correct? if your coil has 2 small terminals that get small guage primary wires that hook up to it and then the 2 secondary(plug wire) terminals it's a dual fire coil. one primary wire gets battery voltage when the igniton/kill switch is on, the other is the trigger from the timer plate/module assembly. when it gets the trigger signal, the grounding of the circuit, the coil fires spark to both plugs, there really isn't anything else to go wrong except that the coil or wire is bad.
a single fire coil is actually 2 coils in one housing. there are 3 small primary terminals, one is power and the other 2 are triggers usually on each side with the plug secondary terminal. the power is supllied at key on, and each termianl is fired individually, no wasted spark/dual fire.
if you have the more modern looking deutch connector as the primary input on your coil, it might be single fire, and if you are not getting the trigger imput for the rear cylider, that would be something different, but without having the factory manual and wiring diagram available to me at the moment, that is the best i can tell you.
m
a single fire coil is actually 2 coils in one housing. there are 3 small primary terminals, one is power and the other 2 are triggers usually on each side with the plug secondary terminal. the power is supllied at key on, and each termianl is fired individually, no wasted spark/dual fire.
if you have the more modern looking deutch connector as the primary input on your coil, it might be single fire, and if you are not getting the trigger imput for the rear cylider, that would be something different, but without having the factory manual and wiring diagram available to me at the moment, that is the best i can tell you.
m
Stellar HDF Member
Joined: Sep 2009
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I think it’s time for a compression/leak down time to be sure the rear cyclinder is healthy.
Also you could try,swapping,the,plug wires to see if the rear cylinder starts firing.
Bob
Also you could try,swapping,the,plug wires to see if the rear cylinder starts firing.
Bob
Last edited by FLTRI17; Aug 2, 2018 at 01:43 PM.
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Joined: Jul 2018
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From: Ireland
Hi. Thanks for the replys, I am actullly away on my holiday in Orlando at the min so can't take a picture. The bike is the MM injection 1340 eve and 100% standard. The coil is the original single fire and I bought a new stock replacement from Harley and it still not spark. I have tested the leads and plugs so it can't be any of them, would it be the cam sensor or would this not make it spark on both. I will post some pic of the coil and bike when home
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Stellar HDF Member
Joined: Jan 2009
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From: On a Lake, not far from the Gulf
Are you sure that you are not getting spark, and it isn't a fuel problem? If you are sure that it is a spark issue then swap the plug wires around, and see if the rear will fire, and the front will not. Could be that the new coil is bad as well. The correct OEM part number is 31639-95 , which is a dual fired coil.
What I suggest doing on any M&M bike problems is to first make sure that the battery is in proper working order. Next check for any stored trouble codes. There is a key ON/Off procedure which will make the engine light flash the stored codes.
Do that after you have fun with Mickey & friends, and report back what you find.
What I suggest doing on any M&M bike problems is to first make sure that the battery is in proper working order. Next check for any stored trouble codes. There is a key ON/Off procedure which will make the engine light flash the stored codes.
Do that after you have fun with Mickey & friends, and report back what you find.
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Joined: Jul 2018
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From: Ireland
Hi did all that and it's the proper new coil new leads new plugs I have swapped them and still on spark at rear so it not compression not fuel. This my first Harley with ecm and just not familiar, I think maybe cam sensor but don't want to waste more cash if it's not , there are no codes with the flashing dash light I tried that