Crank Position Sensor???
#21
Well, I pulled the IAC off and cleaned it again. It was actually pretty clean, I guess spraying the cleaner in and wiping with Q-tips worked. Put everything back together and took a ride, great weather by the way 80 and bright sunny day. Any way, same thing, only happened once but, that was with only 4 shut downs. Same thing, won't start, backfires at the intake. Stop cranking, wait a few seconds and starts up like nothing was different. Starts great 90% of the time, just every now and then starts like crap. I replaced the fuel filter and in tank fuel line but, that didn't help either. I"m at a loss.
#24
#25
Edit to add, when I pulled the MAP sensor out, it was really nasty. I cleaned it up also and reinstalled. Don't know if this had anything to do with my problem but, I was there any way so.....
Last edited by Pothole914; 01-16-2017 at 12:30 PM.
#26
Update: After a 280 mile round trip to the coast yesterday the bike is running fantastic but, the issue with starting is still there. I was trying to pay more attention to the symptoms this time and found one issue I hadn't considered. When the starting issue happens, not only does it backfire thru the throttle body, I smell raw gas for a couple of seconds when it does start. Could the issue be flooding? Could the injectors be leaking and adding more gas in the combustion chamber? I just don't know I have very little experience with fuel injection. Is that a way to test the injectors?
Edit to add: These injectors have 62,000 miles on them.
Edit to add: These injectors have 62,000 miles on them.
Last edited by Pothole914; 01-19-2017 at 05:22 PM.
#27
Update: After a 280 mile round trip to the coast yesterday the bike is running fantastic but, the issue with starting is still there. I was trying to pay more attention to the symptoms this time and found one issue I hadn't considered. When the starting issue happens, not only does it backfire thru the throttle body, I smell raw gas for a couple of seconds when it does start. Could the issue be flooding? Could the injectors be leaking and adding more gas in the combustion chamber? I just don't know. Is that a way to test the injectors?
#28
#29
frankly the easiest way is to pull the injector rail. set the tank up a little, and keeping the fuel line connected crank the bike. fuel pressure will rise as the ecu sees a signal from the crank position sensor. then shut off the key and see if the injector drips after the key is off, and it sits a bit. ,That way you don't need a gauge that you may only use once in your life. If they don't drip, you will need to find some way to see if line pressure is dropping off, that may include a gauge at that time. could be something inside the tank bleeding off pressure
#30
frankly the easiest way is to pull the injector rail. set the tank up a little, and keeping the fuel line connected crank the bike. fuel pressure will rise as the ecu sees a signal from the crank position sensor. then shut off the key and see if the injector drips after the key is off, and it sits a bit. ,That way you don't need a gauge that you may only use once in your life. If they don't drip, you will need to find some way to see if line pressure is dropping off, that may include a gauge at that time. could be something inside the tank bleeding off pressure