testing ignition coils?
#1
#2
i pulled the connectors off each coil individually. every time i unplugged one the bike started running like crap, until i got to #4 (the coil closest to CCT) when i unplugged it, there was no change.. when i plugged it in, it would surge up in RPMs for a split second and go back to what it was at...then unplug it again, same thing, no running worse or anything.. safe to say i have a bad coil? how can i test the coil and wires to make sure im replacing the correct thing
#3
#5
Any of those are possible.
Next is to put a plug in the coil and ground the plug to see if it sparks. That will confirm signal to the coil. After that, check injector and signal, plug (you can swap those around too), compression, and valve clearance.
The coils and injectors have a common power. the ECU grounds each to make them work. Being that you have an excess of fuel, it's probably does not have a bad injector.
Have you checked the FPR yet?
Next is to put a plug in the coil and ground the plug to see if it sparks. That will confirm signal to the coil. After that, check injector and signal, plug (you can swap those around too), compression, and valve clearance.
The coils and injectors have a common power. the ECU grounds each to make them work. Being that you have an excess of fuel, it's probably does not have a bad injector.
Have you checked the FPR yet?
#6
#7
#8
Yes, ground the plug with it in the coil and wire hooked up. You will see if it sparks when you crank it.
Got spark.... Coil signal is good.
Each injector will have constant power and a pulse ground to make it work. A test light on the signal side while cranking will show the pulses, unless you have a noid light instead to test it. You have tons of fuel, so I bet everything will be fine there.
Do you have a compression gauge?
Got spark.... Coil signal is good.
Each injector will have constant power and a pulse ground to make it work. A test light on the signal side while cranking will show the pulses, unless you have a noid light instead to test it. You have tons of fuel, so I bet everything will be fine there.
Do you have a compression gauge?
#9
#10
Just did compression test and not sure if I'm doing it right. I got
1=50
2=52
3=60
4=52
I am following the directions to a T. I have the fuel pump plug unhooked, all coils and spark plugs. I'm using a harbor freight compression tester I just bought. Part number 69885. I am screwing it into the hole the spark plug goes and getting it as tight as I can by twisting the hose and all and then attach the gage and open the throttle all the way and hold the start button until the gage stops rising.. Any ideas or is it just that bad? Doesn't seem to run bad enough for all 4 cylinders to be THAT low on compression?
1=50
2=52
3=60
4=52
I am following the directions to a T. I have the fuel pump plug unhooked, all coils and spark plugs. I'm using a harbor freight compression tester I just bought. Part number 69885. I am screwing it into the hole the spark plug goes and getting it as tight as I can by twisting the hose and all and then attach the gage and open the throttle all the way and hold the start button until the gage stops rising.. Any ideas or is it just that bad? Doesn't seem to run bad enough for all 4 cylinders to be THAT low on compression?
Last edited by jeremymik84; 04-16-2016 at 10:19 PM.