Starts, Runs, won't restart

[E.T. Reed]

I have a 2003 Johnson/Suzuki 115 outboard. It will start first thing in the morning. It will run for a few minutes, then it gets choppy. I shut it off. It will not restart. If I let it sit a couple of hours, it will start- run a minute- then won't restart.

I replaced the VST with a used one from ebay, but still have the same issue. Seems like the issue is related to the fact that the engine starts cold but not warm. Thanks for any insight!

 

[ct1762@gmail.com]

try suzuki forum. this is a 4 stroke.

 

[E.T. Reed]

I have a 2003 Johnson/Suzuki 115 outboard. It will start first thing in the morning. It will run for a few minutes, then it gets choppy. I shut it off. It will not restart. If I let it sit a couple of hours, it will start- run a minute- then won't restart.

I replaced the VST with a used one from ebay, but still have the same issue. Seems like the issue is related to the fact that the engine starts cold but not warm. Thanks for any insight!

The OP engine is a four stroke EFI.

 

[racerone]

Start with replacing the fuel filters.----Did this problem show up suddenly?----How did it run for you last season ?----Did you inspect VST ?----Just bolted it on ?-----Checked fuel pressure regulator ?----Needle and seat in the VST ?------Post all information !

 

[oldboat1]

Doesn't restart after warm-up. How hot does it get (top of the heads)?

 

[E.T. Reed]

Start with replacing the fuel filters.----Did this problem show up suddenly?----How did it run for you last season ?----Did you inspect VST ?----Just bolted it on ?-----Checked fuel pressure regulator ?----Needle and seat in the VST ?------Post all information !

Yes, I replaced the fuel filters. It ran good last year. I started to prep it for this year but it will not restart after only minutes of idle. I replaced the VST but the issue is exactly the same. The fuel pressure regulator is inside the VST. I have not yet checked the pressure on the fuel rail.
It starts fine, runs a couple of minutes. then dies. It will not restart warm. I let it cool a couple of hours and it runs fine for a couple of minutes, then dies and wont restart unless it cools down. It seems to be a fuel issue related to idle and heat. It does not get very hot because it idles for only a minute or two literally. As soon as it starts to get warm the rough idle starts and then it dies.
I removed the plastic air intake up to the spark arrestor to look for air intake obstructions and noticed about a 1/2 pint of gas/oil muck was in the intake. I wonder where that came from? If I pumped the bulb too much I wonder if the gas would flow from the VST to the rail through an injector back into the intake? This may not be related to the warm up issue.
I have no codes flashing. Thanks...

 

[Crosbyman]

if you google this Suzuki outboard no warm start problem all sorts of links come up incl. this one where one user said that replacing his water pump cleared an ECU overheat issue ( see 2catcj1) . anyway the issue seems related to hot ECU...

Suzuki DF115 Won't Start After It's Hot [Archive] - Walleye Message Central

[Archive] Suzuki DF115 Won't Start After It's Hot Motors and Props

www.walleyecentral.com

one user suggested using a freeze spray to cool suspect components while in a NO START condition due to heat.

 

[oldboat1]

^^That's an interesting idea! There are lots of no-start reports with a variety of motors, where the problem could be overheated ignition parts.

 

[Crosbyman]

Canned air to clean keyboards found at the Dollar store ($4CDN) makes a great freezer spray when held upside down

no need to buy the expensive stuff for electronics .

 

[E.T. Reed]

if you google this Suzuki outboard no warm start problem all sorts of links come up incl. this one where one user said that replacing his water pump cleared an ECU overheat issue ( see 2catcj1) . anyway the issue seems related to hot ECU...

Suzuki DF115 Won't Start After It's Hot [Archive] - Walleye Message Central

[Archive] Suzuki DF115 Won't Start After It's Hot Motors and Props

www.walleyecentral.com

one user suggested using a freeze spray to cool suspect components while in a NO START condition due to heat.

Thank you. I'll check it out. The engine starts cold but runs for only about 60 seconds. I don't think the ECU overheats in 60 seconds.

 

[oldboat1]

^^Much less than that if an electrical fault -- electrical overheating issues apply to a starter too, which might then not produce sufficient rpm for starting/restarting.

 

[E.T. Reed]

Start with replacing the fuel filters.----Did this problem show up suddenly?----How did it run for you last season ?----Did you inspect VST ?----Just bolted it on ?-----Checked fuel pressure regulator ?----Needle and seat in the VST ?------Post all information !

Stupid is as stupid does! Problem was fouled spark plugs! So simple. I think an injector is or was leaking.