Not all cylinders firing

inferno

inferno

Well-known member
Rode fine last night but this morning woke up to this.

http://www.youtube.com/watch?v=5XYkiI8-lro&feature=youtu.be

Sounds like not all cylinders are firing. Ideas on what needs to be done?


I had some head bearing work done a few days ago, where the horn needed to be disconnected. On the ride back the horn just started by itself suddenly on the highway and then i lost half my electrical.( Brake light, neutral light, signals). Ive traced it all to one fuse, so I have to check the fuse, but I dont know if it could be related to the ignition coils/spark plugs. The circuit are independent.

Thanks!
 
That's not a hard thing to diagonose...check to see which cylinder is running cold then go about figuring out why its not firing..

If its a coil issue....or a plug issue.

have seen lots of these issues...usually related to a aging electrical system....

Replacing head bearings = lots of banging = might have caused vibration that might have gotten a connector lose....(its possible - but far fetched)
 
Did a bit of tracing yesterday. It looks like its the Horn that keeps blowing the fuse. I replaced the fuse, started riding, and once again the horn started up on its own and then i lost all lights again.
Sigh. need to get more fuse.
 
The fuse isn't the issue. Something else is causing the problem.

Did you take the bike somewhere to have the head bearings done? And, riding home from there you ran into electrical problems? It would seem to me your problems are related to something that was done during the bearing service, take it back to them.
 
This is from my experience with my 94 1100
Hey fire it up, keep it running for as long as u can, check the headers, lick ur finger and touch each one, I bet one or two cylinders aren't firing aka one or two that will remain cold, take the gas tank off, start checking the connections for each coil, if its both cylinders that share a coil, I'd trouble shoot that, if its only one of cylinder that was cold, pull the plug caps off the one that were cold one at a time. So remove the plug cap, fire it up, should be the same no change from your video, if its different or wont start at all you pulled a wrong one. I've found that sometimes the plug wire pulls out of the cap, on my GSXR they are the screw in type, mine were burnt and hardly touching. First I'd do is remove the wire from the cap, cut a little bit off and thread it back in to the cap, reinstall and test again. Hopefully that fixes it, and hopefully its not a coil.
Also sounds like ur horn has a short
 
CodysGSXR said:
This is from my experience with my 94 1100
Hey fire it up, keep it running for as long as u can, check the headers, lick ur finger and touch each one, I bet one or two cylinders aren't firing aka one or two that will remain cold, take the gas tank off, start checking the connections for each coil, if its both cylinders that share a coil, I'd trouble shoot that, if its only one of cylinder that was cold, pull the plug caps off the one that were cold one at a time. So remove the plug cap, fire it up, should be the same no change from your video, if its different or wont start at all you pulled a wrong one. I've found that sometimes the plug wire pulls out of the cap, on my GSXR they are the screw in type, mine were burnt and hardly touching. First I'd do is remove the wire from the cap, cut a little bit off and thread it back in to the cap, reinstall and test again. Hopefully that fixes it, and hopefully its not a coil.
Also sounds like ur horn has a short
Click to expand...

Is this what you are referring to as the plug cap?
http://i.imgur.com/NUip9.png
 
VFR.CBR said:
The fuse isn't the issue. Something else is causing the problem.

Did you take the bike somewhere to have the head bearings done? And, riding home from there you ran into electrical problems? It would seem to me your problems are related to something that was done during the bearing service, take it back to them.
Click to expand...

The horn circuit is totally different than the coil/ plug circuit. They shouldn't effect each other.

The simple way to test if the horn is an issue is by taking the connections to the horn off.
 
frekeyguy said:
The horn circuit is totally different than the coil/ plug circuit. They shouldn't effect each other.

The simple way to test if the horn is an issue is by taking the connections to the horn off.
Click to expand...

You're assuming that the horn and ignition circuit aren't caused by the same problem. If there was work done on the bike and now the electrical is acting funky in many different ways (horn, misfiring) then chances are it's the same root cause. I would suspect that there is wiring either caught somewhere or moving an already problematic harness has brought the problem to light.
 
sircastic said:
You're assuming that the horn and ignition circuit aren't caused by the same problem. If there was work done on the bike and now the electrical is acting funky in many different ways (horn, misfiring) then chances are it's the same root cause. I would suspect that there is wiring either caught somewhere or moving an already problematic harness has brought the problem to light.
Click to expand...

Yes this is totally possible. A head bearing job would cause the main harness that comes to the handlebars to be moved, and the whole front end off etc etc...

so its possible....since its a 89 Katana 600....the odd of a faulty harness being the cause is highly likely...that's 23 years of heating/cooling cycles and weather and plastic/rubber/electrical getting brittle and degrading.
 
frekeyguy said:
Yes this is totally possible. A head bearing job would cause the main harness that comes to the handlebars to be moved, and the whole front end off etc etc...

so its possible....since its a 89 Katana 600....the odd of a faulty harness being the cause is highly likely...that's 23 years of heating/cooling cycles and weather and plastic/rubber/electrical getting brittle and degrading.
Click to expand...

Just cautioning about fixing the symptoms rather than the problem ... when servicing a vehicle a customer will often diagnose the problem for you with the right information and questions asked. From what I read this is most likely one of those times.
 
so most likely cylinder 1 and 4 is not firing ( Exhaust headers for cylinder 2 and 3 was dry while 1&4 remained wet in yesterdays rain) and i believe 1/4 is connected to the left coils. I don't think i can check the plug connection without taking off the tank completely.

The horn is going to need rewiring but for now ill disconnect it. It'll keep blowing the fuse and i lose half my lights. im still trying to figure out why the plugs are acting up a day after the job.

sigh ttc-ing stinks.
 
Update. Bike is not starting at all now. It is the first and the fourth cylinder. I've cheked the connection and the are connected fine. Didnt expect them not to be since they weren't even touched at all recently.
Couldn't check the plugs since I dont have a narrow wall socket.This is frustating
 
inferno said:
Update. Bike is not starting at all now. It is the first and the fourth cylinder. I've cheked the connection and the are connected fine. Didnt expect them not to be since they weren't even touched at all recently.
Couldn't check the plugs since I dont have a narrow wall socket.This is frustating
Click to expand...

removing plugs require a plug socket...crappy tire sells kits for plug removal..they'r about $10....

have you disconnected the horn ?
 
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