autoarcheologist
Seaman Apprentice
- Joined
- Apr 23, 2014
- Messages
- 46
I'm trying to get our 68 100hp Evinrude running again. We used it last summer, then one day it died at the dock and wouldn't start. I diagnosed the problem as a bad ignition module (which was relatively new) so I sent it back to CDI and they replaced it. The wiring harness, plugs, coil and rectifier are also all new, as is the battery. The carbs were tuned last year and winterized last fall.
This summer I also replaced the sensor rotor with the "Phase 2" rotor with smaller lobes per the CDI instructions.
It seems like the engine will fire once, but too early, then shut down. I assume it's kicking the engine the wrong direction and the anti-reverse spring is shutting it off.
If I test the ignition alone I get a nice spark. But the odd part is that the ignition fires both when I tough the two sensor wires together, and again when I pull them apart. I thought it should only fire when grounded together.
I tested the ignition system by rotating the crankshaft to each cylinders position, and I only get a spark from the correct cylinder. All 4 cylinders spark.
If I crank the engine with the plugs out but connected and grounded, I see multiple sparks and it's hard to tell if they are firing in the correct order.
Is it possible to get a bad module that fires too many times?
Should I go back to the rotor with larger lobes, so even if it is firing too many times it won't matter as much?
I also tried disconnecting the anti-reverse circuit, and got one loud backfire when I tried to start it, so that also sounds like a spark at the wrong time.
Any thoughts? I'd love to get this running again and use it a few times before winter hits.
Thanks!
Ian
This summer I also replaced the sensor rotor with the "Phase 2" rotor with smaller lobes per the CDI instructions.
It seems like the engine will fire once, but too early, then shut down. I assume it's kicking the engine the wrong direction and the anti-reverse spring is shutting it off.
If I test the ignition alone I get a nice spark. But the odd part is that the ignition fires both when I tough the two sensor wires together, and again when I pull them apart. I thought it should only fire when grounded together.
I tested the ignition system by rotating the crankshaft to each cylinders position, and I only get a spark from the correct cylinder. All 4 cylinders spark.
If I crank the engine with the plugs out but connected and grounded, I see multiple sparks and it's hard to tell if they are firing in the correct order.
Is it possible to get a bad module that fires too many times?
Should I go back to the rotor with larger lobes, so even if it is firing too many times it won't matter as much?
I also tried disconnecting the anti-reverse circuit, and got one loud backfire when I tried to start it, so that also sounds like a spark at the wrong time.
Any thoughts? I'd love to get this running again and use it a few times before winter hits.
Thanks!
Ian