Re: 94 Ocean Pro No Spark
Well, it is kinda weird, the problem you are having. It is a common problem too.
Here is your BOOK.:joyous:
Coupla of absolute MUSTS:
Must have the engine spinning at greater than 250 rpm with the starter motor. It will not gen spark if it is going slower.
Must have proper stator voltage output to the pack.
And, (I might get some argument here), must have +12v on the yellow/red wire that goes to the pack from the starter solenoid/harness.
Here is the breakdown of how spark is generated.
Flywheel spins under starter motor power. The spinning flywheel magnets generate several voltages in the stator winding coils, the primary ones you need are the brown pairs (2 each) from the stator and the orange pair (one pair) from the stator.
The voltages from the stator are fed into the powerpack and are switched through it at the proper time to gen spark out at the ignition coils.
That switching action thru the pack is accomplished by the trigger signal from the timerbase, which is under the flywheel also. There is a magnet ring on the center hub of the flywheel which is spinning as the flywheel turns. It has a slot in it. When that slot passes any one of six sensors located in the timerbase, the timerbase sends out a trigger signal to the pack to fire the appropriate cylinder.
There is a "design method to the madness".....on the timerbase wiring, you have a total of eight wires broken out into two groups of four, a left and a right side set of plugs. In each plug you have a blue, purple, and green wire. These are the individual signal trigger wires to the pack. For example, on the left side timerbase plug, the blue wire is the trigger signal for #2 cylinder. When the spinning center magnet's slot passes by the timerbase sensor, it will trigger a very small, low voltage signal back to the pack on that blue wire.
TB wiring is such: for each bank (side) of cylinders, the blue wire is the top cylinder in the bank, the purple wire is the middle cylinder in the bank, and the green wire is the bottom cyl in the bank.
This leaves the white wire on one side plug, and the black/white wire on the other side plug. These wires provide power from the pack back to the timerbase to operate the circuitry internal to the timerbase.
If you have an open in those two wires anywhere, no spark at all occurs. If you have an open in any of the blue, purple, or green wires, then spark will be dead on one cylinder.
Now back to the brown and orange pairs from the stator. The brown pairs (2 of them) provide a high voltage AC source (>150vac) which is manipulated and switched out to the ignition coils. No voltage on the brown pairs, no voltage out at the coils (orange primary wires).
One brown pair drives the starboard bank, the other brown pair drives the port bank.
The orange pair is a lower voltage AC source (11-22 VAC) that actually provides power to the pack to operate it.
The yellow/red wire provides +12v to the pack during start mode to power the pack until the orange wires take over as the engine starts, and it also tells the pack that it is in a "start" condition, and turns on the internal feature called QuickStart if so equipped.
The orange coil primary wires are color coded too. They use almost the same design method as described above regarding the timerbase.
The top cyl primary will be orange/blue. The middle cyl primary is orange. The bottom cyl is orange/green.
Most all J/E CDI (capacitive discharge ignition) engines use some sort of slight variation of the above.
Often your problem of intermittent spark, spark on only one, spark quality problems, etc. are caused by the engine turning over too slowly.
Remove all spark plugs so engine turns as fast as possible, and re-test spark. Charge battery fully to get most speed.
Then, the powerpack is a suspect, but only call it a bad pack if the voltage from the brown pairs or the orange pair is incorrect.
If those voltages are wrong, look at the stator.
If no spark at all, ever, then it could be all three....timerbase, pack, or stator.
Go to
http://www.cdielectronics.com and locate their excellent troubleshooting guide, as well as their DVA chart which specifies all the voltages you should be see from the stator and timerbase.
There are other details re spark issues, but these are the basics.
