'95 J 150 Runs great for 5 seconds then dies! HElp

I have a 1995 Johnson 150. Last time I used it last month it worked great. 2 days ago I was on the water at almost full throttle and the engine just quit running. No puttering or spitting it just stopped running. When I tried to restart it would just turn over, no backfire or attempt to start. I got towed back. After I put it on the trailer it cranked and ran for about 5 seconds then died. I tried again last night and it did the same thing. I changed the plugs, there is fuel at the fuel rails, the plugs are firing when I remove them but the motor doesnt sound like its even trying to run. Please give me some guidance on what to do next. THanks, Doo

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Take a fuel sample.Holding a spark plug to the block to check spark is no test at all

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Does it only fire/run when you have the starter motor engaged?

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Im not sure what you mean but I can crank the engine it will run good for about 5 seconds then die. It will not sputter it just stops. It will not restart for several hours then it only runs for 5 seconds again. The fuel is only 2 weeks old. If seeing a spark is no test at all then how do I know if I have a good spark. thanks.

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

I think I see what you mean now. I only have to engage the starter for a second and the engine will crank, start, and run for 5 seconds without the starter being engaged. thanks

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

The reason I ask is that the powerpack normally receives its power supply from a power coil in the stator, but during cranking there is a separate power supply fed from the starter solenoid. If the power coil is faulty, sometimes the engine will only run when the starter is energised. Not your problem.<br /><br />The way to check spark properly is to use a spark tester. There's been quite a few posts on how to do this. Do a search to find them.<br /><br />As R.Johnson says, check the fuel for water contamination. Otherwise, could be an ignition problem. There's a good ignition trouble shooting guide for the OIS2000 which can be downloaded from www.rapair.com.<br /><br />Check your fuel & spark first. Check your compression also.

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Is it just my computer? When I click on www.rapair.com it says it does not exist?

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

OK I got it, the link does not work but I typed it in then it worked.

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Ok now I checked the fuel, its fine. I bought a spark tester. I started the engine first to see if it was still doing the same thing, it ran 5 seconds then died. Tried to get a spark and now nothing. I waited a day and now it wont even start. I am getting no spark on any wires. I have not started the rapair.com yet, havent had time yet. Would yall lean to the powerpack now or do I have to go through more troubleshoooting. Thanks very much

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

Okay, I found another post that said to unplug the big red plug and when I did I get a strong spark. The engine does not run but I assume that is because the plug is not together. Should I replace the key switch or the deadman? thanks

Re: '95 J 150 Runs great for 5 seconds then dies! HElp

thanks, it was the ignition switch