2003 Yamaha 115 4 stroke stalls

seapro21

Recruit
Joined
Aug 26, 2012
Messages
1
My 2003 Yamaha 115 4 stroke has 533 hours, starts and runs great but stalls regularly when coming back to idle speed and always stalls when passing through neutral when changing gears. Changed fuel filter and installed new fuel/water separator(no water but dirty fuel in old separator) and just ran for 1/2 hour with same problems! Any ideas?
 

schematic

Lieutenant Junior Grade
Joined
Jan 12, 2008
Messages
1,102
Re: 2003 Yamaha 115 4 stroke stalls

-ISC motor
-dirty injectors
-low fuel rail pressure
-leaking fuel pressure regulator
 

1nebel0

Chief Petty Officer
Joined
Nov 28, 2005
Messages
512
Re: 2003 Yamaha 115 4 stroke stalls

Have your injectors cleaned and flowed every couple of years...Easy to do and the best money spent....
 

Capt Ken

Commander
Joined
Jul 30, 2002
Messages
2,269
Re: 2003 Yamaha 115 4 stroke stalls

You have a faulty/dirty IAC (idle air controler) or intake pressure sensor. Located on the port top of the engine just under the shroud. You really need to have it connected to the Yamaha diagnostic system and have the voltages read on these and other items.
 
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