| Author | Message | ||
     Damnut |
Here is the original thread: http://www.badweatherbikers.com/buell/messages/476 23/750684.html?1416249077 So I'm stumped. I have bypassed all interlocks, installed a new ignition switch and another coil and it still just cuts out randomly. I also took apart the kill switch and everything looked good but I cleaned the contacts anyway. Problem: I go for a spin and after riding for a few minutes the bike just dies like someone is turning the kill switch off. Sometimes for a split second and other times it'll take as long as 10 minutes to start again. It has happened enough that right before it happens the bike runs "differently", only for a second though. The only thing I haven't checked yet is the cam position sensor, which I plan to do this weekend. This sucks, I can't ride either bike right now. The XB's fuel pump is on it's way out and needs replacing. •••• me. | ||
| Firemanjim |
Bank angle sensor-- and have you done a "wiggle test" on your wiring? | ||
| Blks1l |
I was having similiar issues that I could never isolate replaced TPS, O2 sensor throwing parts at it. No fault codes, I put a carb on it using the race ecm, and never had another issue. Probably not much help since I still never actually figured out the issue with except it just works now! | ||
| Damnut |
It's hard to do the wiggle test Jim since it's intermittent. I believe that if I just unplug my bank angle sensor that it'll run but just throw a code, right? That's what the XB does. It definitely seems like its losing spark cause it dies quickly like the kill switch is being shut off. Now I know that the engine light comes on when it dies out on me,like it does when the bike first turns on. Almost like the ignition switch is being turned off and on but I never see the bike lose electrical power. It will crank over but not start when it's in F up mode so I am ruling out the ignition. Thanks, Jim | ||
| Kalali |
Do the wiggle test with the bike running and see if it cuts out. It would work better if you lift the tank since most of the wire looms run under the seat. | ||
| Scott_in_nh |
Well it is either fuel or spark. You could have a fuel pump cutting out. When it stops and you crank it for 10 minutes - do you smell fuel? I would be prepared to pull a plug and see if it has spark, if it does then it is fuel. Or after cranking with no start either the plug is wet - no spark, or the plug is dry - no fuel. | ||
| Raceautobody |
I had this happen when I first got my X1. The fuel vent hose was pinched with a zip tie. That fixed mine for about a year then it happened again. I traced it down to a broken ground ring terminal. The one that is to the frame above the battery next to the main fuse. The ring was cracked and after a few miles the heat would expand the brake and it was like someone shut it off. Wait 10-15 mins and it would start and off you go. Just some things to check | ||
| Dannybuell |
Kind of fuzzy here its been a while. My 96s1 has 105,000 miles, the symptoms were the same. A few years back the wire from the oil pressure sensor by the oil filter was down to one strand, reattached. eventually traced back and replaced. There was also a neutral switch that got replaced down by the front pulley? I too had a pinched gas tank vent line do this to me. It would go a few miles cut out, wait a few minutes start right up. 3rd time in a 7 mile ride. I loosened the gas cap, it started right up. The vent line and gas vapors had collapsed the rubber into itself. | ||
| Damnut |
I'm going to look into it a bit more this weekend, I hate not having a bike available to ride. What sucks is this just happened out of the blue. Scott- I never smell fuel. When it died for a few minutes the other day I could hear the fuel pump kicking on but it wouldn't start so that's why I'm leaning more towards spark than fuel. | ||
| Harleyelf |
Did you change the cam position sensor? It is under the round cover plate on the right side, in line with the center of the crankshaft. You have to drill the rivets out, then unscrew the under-plate to get at it. They will smell fried if they have failed. | ||
| Damnut |
That's on the list for this weekend Harleyelf. I'm going to borrow a o-scope to see if I can catch it failing. | ||
| Ceejay |
check wiring behind cam cover, the oil pump has a sharp brass fitting that can cut through the covering of the wiring, and cause a bad ground. had an M2 do this, especially after warmed up as the oil/spooge that's hiding there would start to move around and cause a short. | ||
| Buellistic |
Disconnect the SPEEDOMETER SENSOR ??? Then try disconnecting the SIDESTAND SWITCH ??? Let us know if this helped ??? | ||
| 5liter |
Engine temp sensor? | ||
| Buellistic |
If you are engine gets too hot, check your timing ... | ||
| Damnut |
side stand switch is bypassed, the engine isn't overheating. I was thinking the temp sensor as well but I want to look at the cam sensor and grounds first. I don't want to try too many things at once and not be able to find out why this is going on. | ||
| Buellistic |
Always one at a time !!! | ||
| Damnut |
Well I hooked up an o-scope to my cam sensor and it looks good but the problem is intermittent so it could technically still be it. All the ground points look good. Reseated connectors, relays and fuses. Going to run with the vent tube disconnected to see if that could be it. Cam sensor signal.  I should be able to run with my temp sensor disconnected, correct? Should just throw a code? | ||
| Buellistic |
YES and it only gives a code when too hot ... | ||
| Two_seasons |
When the Engine Temp Sensor apes up you'll know it by this... Runs on ONE CYLINDER And it loads up the spark plugs fast! I think there is some ECM interaction that takes the signal from a failing ETS and makes it run like a skip spark mode, but instead of every third rotation, it does it for every rotation, hence the running on one cylinder symptom! | ||
| Damnut |
Well if a failing temp sensor only kills one cylinder then that isn't my issue. One less thing to check.  Went for a half hour ride this evening and it didn't act up. Going to take it for a longer ride tomorrow and see what happens. | ||
| Imadog |
Nice o'scope picture of the cam position sensor pulse. I still would not rule it out though, my Nissan Sentra had similar symptoms, it could run for days without issue and then the engine would just die, fortunately, it always somehow managed to restart and never left me stranded. I replaced the cam position sensor and crank position sensor and have had no more issues in the past couple years. | ||
| Firemanjim |
With temp sensor disconnected it defaults to COLD setting adding a ton of fuel. | ||
| Damnut |
Thanks Jim, haven't made it there yet. Took it for a half hour ride on Saturday and about an hour ride on Sunday. No issues so I'm going to take to to work tomorrow and see what happens. Round trip to work and back is ~150 miles. See what happens. | ||
| Bluzm2 |
Jim, I worked on an X1 a while back, it ran like crap, spit, sputterd and died. I couldn't ride it around the block. I hooked up ECM Spy and checked the temp sensor, it was WAY off and very non linear. Changed it out and the bike ran like a champ. | ||
| Damnut |
Thanks Brad! Rain today so the bike stayed home. I'll take it in tomorrow. | ||
| Damnut |
Well 250 miles later, no problems. I haven't a clue what was wrong. Not sure if it was a pinched fuel vent hose or it was just reseating all the connectors, fuses and relays that "fixed" it. Kinda scary. I guess the issue is ongoing? | ||
| Harleyelf |
Gremlins. They get scared if you come too close to them, and they look for another bike to live in. | ||
| Ducley |
My ETS was similar. Bike acted like a bucking bronco after 10-15 minutes of riding, backfiring included. It did kinda sounded like a single when this happened. Changed throttle position just to try to find a happy place. Or one not so miserable.....Didn't work. Repair shop said ETS was reading either 10 degrees low or just 10 degrees. I don't remember. They replaced it and no problems since. |
