I have a '14 custom with 17500 miles on it. Bought new in '14 with 0 miles. The motor is all stock except for the moaning whale mod and alternator tech bulletin fix. I ride 50 miles round trip commute everyday for work rain or shine. So about 6 weeks ago I started having issues when it first started. The motor would start and then idle so low it would almost stall. After 20-30 seconds it was idling fine. Then I noticed a couple of weeks ago that it seemed down on power depending on the weather that day and the throttle control was terrible at low RPM's (more so than normal). I was also experiencing popping during decel while in first gear.
I spent a couple of hours looking thru the service manual for anything (simple) that might be causing it. I figured it might be a pinched emissions hose or something. Turns out there was a reference to the correct ignition timing during start up that is related to the intake pressure sensor that is mounted to the intake manifold. The service manual recommends making sure the sensor hole is not clogged and that the sensor is not loose.
I pulled the tank. I pulled the Bosch intake pressure sensor off the manifold and sprayed it off with MAF (mass air flow) sensor cleaner that I picked up at AUTOZONE. Guess what?? Problem seems to have been solved. The idle is normal on every start. No more popping when decelerating in first gear. And the low RPM throttle control is back to a usable (subjective) state.
These motors recirculate so much oily engine case air back into the intake manifold that it clogged up the sensor. I'm adding this to my winter storage annual maintenance list for this bike!!
I spent a couple of hours looking thru the service manual for anything (simple) that might be causing it. I figured it might be a pinched emissions hose or something. Turns out there was a reference to the correct ignition timing during start up that is related to the intake pressure sensor that is mounted to the intake manifold. The service manual recommends making sure the sensor hole is not clogged and that the sensor is not loose.
I pulled the tank. I pulled the Bosch intake pressure sensor off the manifold and sprayed it off with MAF (mass air flow) sensor cleaner that I picked up at AUTOZONE. Guess what?? Problem seems to have been solved. The idle is normal on every start. No more popping when decelerating in first gear. And the low RPM throttle control is back to a usable (subjective) state.
These motors recirculate so much oily engine case air back into the intake manifold that it clogged up the sensor. I'm adding this to my winter storage annual maintenance list for this bike!!