Help! My 2007 Breva 1100 has developed a stalling problem but runs great above 2000 rpm. I spent the last two days trying everything I could think of, to no avail.
Tuneup: I installed new plugs, air filter, and adjusted the valves. No change.
Idle air: I also cleaned and verified operation of the idle step motor (you can watch it open and close when the engine is shut off). I even tried disconnecting the idle air intake tubes from the step motor and left them wide open, expecting a fast idle bur didn't get it. Stalls anywway with plenty of air.
Spark: I pulled the plugs and watched the spark as the engine cranks. Looks strong- bright yellow and snappy. Also reinstalled the plugs but disconnected the wire. The spark jumps strongly to plug as you get it close.
Injectors: I pulled these too and looked at the jet holes under a microscope. They looked clean but I put a little carb cleaner in there anyway. I also watched them operate out of the throttle body as I cranked the engine. They puff fuel as expected. I don't suspect there since the bike funds fine off idle.
Intake air sensor: I measured 3.3 k slightly warm. This looks right. Also got reasonable results for the cylinder gear thermister.
Carb balence: within 1. mm at 3k rpm
Idle air bypass screws:. hard to make any adjustments here since it wont idle.
Fault codes: no new ones, even after the engine stalls out. I dont trust the old ones as they don't reflect gthe current problem.
Any suggestions would be appreciated!
Tuneup: I installed new plugs, air filter, and adjusted the valves. No change.
Idle air: I also cleaned and verified operation of the idle step motor (you can watch it open and close when the engine is shut off). I even tried disconnecting the idle air intake tubes from the step motor and left them wide open, expecting a fast idle bur didn't get it. Stalls anywway with plenty of air.
Spark: I pulled the plugs and watched the spark as the engine cranks. Looks strong- bright yellow and snappy. Also reinstalled the plugs but disconnected the wire. The spark jumps strongly to plug as you get it close.
Injectors: I pulled these too and looked at the jet holes under a microscope. They looked clean but I put a little carb cleaner in there anyway. I also watched them operate out of the throttle body as I cranked the engine. They puff fuel as expected. I don't suspect there since the bike funds fine off idle.
Intake air sensor: I measured 3.3 k slightly warm. This looks right. Also got reasonable results for the cylinder gear thermister.
Carb balence: within 1. mm at 3k rpm
Idle air bypass screws:. hard to make any adjustments here since it wont idle.
Fault codes: no new ones, even after the engine stalls out. I dont trust the old ones as they don't reflect gthe current problem.
Any suggestions would be appreciated!