Motor problem need help

[riverfish]

I have a 96 evinrude 150 model -150 ELED . The motor start off running fine. 60 mph @ 5600 rpm . The problem is after running and stopping for couple hours then running again it will be running fine then its like it drops a cylinder while running the rpm drop to 5000 rpm wide open 50 miles per hour. Then it idles ruff,next day cranks up runs fine half the day ,then same thing happens , any help or Ideas?

[ChampioNman]

Pull your plugs and check which on is fouled, either move the plug or move the coil packs around, could be a bad coil.

[riverfish]

Thanks, will check plugs but last time it did this ,I put a new set of plugs in it .Will pull them and check again , will keep you updated , Thanks for your help.

[Sportwin]

Check the small orange wires going to the ignition coils. They have a rubber boot on the end where the wire is attached to the coil. Twist and pull them off one at a time and inspect the small pin on the coil (primary circuit) and the wire terminal inside the boot. The terminal on the coil and the one in the boot should be as shiny as a new nickel. If you see a dirty brown color (arcing) the connection is not good and there is too much resistance resulting in an ignition miss. If you find this condition on any of the terminals, clean the coil terminal with a small wire brush and sandpaper. The terminal on the end of the wire will need to be replaced as well. You'll have to purchase the ends from a J/E dealer. It also requires a special crimping tool to install the new end on the wire. If this condition exists on your engine, it will normally run fine initially when cold and start cutting up after the engine warms up.

[riverfish]

Thanks Sportwin, Will check when I get off work today , Thanks for the help, will keep updating ..

[riverfish]

Checked the firing on all cylinder, standing at the back of motor the bottom cylinder on the left side has no fire , could that be a coil ? changed plug wire still no fire.

[ChampioNman]

Yep sure could be. You can swap with another.

[riverfish]

ChampioNman went back and checked the firing today 4-20-07 and now that cylinder is firing on the same coil any suggestion, I don't know what to do now. Thanks

[ChampioNman]

You may have just had a loose connection, try it again and see what happens.