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Jan 23rd, 2013
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2003 yamaha 4 stroke starting problem 115hp #12344878
07/18/17 12:55 AM
07/18/17 12:55 AM
Joined: Aug 2010
Posts: 126
West, Tx
stickerman Offline OP
Outdoorsman
stickerman  Offline OP
Outdoorsman

Joined: Aug 2010
Posts: 126
West, Tx
Have a sometimes starting problem as engine warms up. On short runs in morning it cranks easily. As day wears on you have to turn engine over 3 4 or 5 times to get it to hit. Today after a 20 minute run at 5000 rpm, came to my spot and shut it down. Fished for 10 minutes, got ready to go, but would not start. Engine turned over fine but acted like it was not firing. Kept trying to start it every 10 minutes. Started in on trolling motor and kept trying to crank every 10 min or so. Had just about given up, hit it one more time and it started immediately. Ran to ramp and partially loaded, killed engine and then restarted a half dozen times never missed a beat. If it were a car, I'd think an ignition module getting hot, but don't know about these. ANYBODY had a problem like this before? and if so, what was your fix. Thanks in advance, John

Last edited by stickerman; 07/18/17 12:56 AM.
Re: 2003 yamaha 4 stroke starting problem 115hp [Re: stickerman] #12344985
07/18/17 01:37 AM
07/18/17 01:37 AM
Joined: May 2003
Posts: 11,496
Littlefield Tx & Lake A. H. US...
gary purdy Offline
TFF Guru
gary purdy  Offline
TFF Guru

Joined: May 2003
Posts: 11,496
Littlefield Tx & Lake A. H. US...
Sounds like a vapor lock problem or it could be the High-pressure electric pump or the fuel pump relay.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: 2003 yamaha 4 stroke starting problem 115hp [Re: gary purdy] #12345384
07/18/17 11:59 AM
07/18/17 11:59 AM
Joined: Aug 2010
Posts: 126
West, Tx
stickerman Offline OP
Outdoorsman
stickerman  Offline OP
Outdoorsman

Joined: Aug 2010
Posts: 126
West, Tx
I can hear fuel pump running, but that does not mean that its not a vapor lock. Thanks for any and all responses.

Re: 2003 yamaha 4 stroke starting problem 115hp [Re: stickerman] #12350624
07/21/17 12:38 AM
07/21/17 12:38 AM
Joined: Jul 2011
Posts: 4
Bossier City, La
J
Judge2009 Offline
Green Horn
Judge2009  Offline
Green Horn
J

Joined: Jul 2011
Posts: 4
Bossier City, La
Had the exact scenario on my 2006 Yamaha 115hp 4 stroke last week while down at Calcasieu. Mechanic put on computer could find not issue to explain. Was getting significant pressure when open fuel cap, found kink in fuel vent line he believes was causing vapor lock. Straightened vent line and ran on water hose for 48min, cranked right back. Have not put in water to make long run to test it yet.

Re: 2003 yamaha 4 stroke starting problem 115hp [Re: Judge2009] #12351362
07/21/17 02:35 PM
07/21/17 02:35 PM
Joined: Aug 2010
Posts: 126
West, Tx
stickerman Offline OP
Outdoorsman
stickerman  Offline OP
Outdoorsman

Joined: Aug 2010
Posts: 126
West, Tx
Thanks for response. Have at shop now and will call mechanic and tell him of your problem. Maybe Maybe.

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