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PostPosted: Sat Jun 08, 2024 11:58 am 

Joined: Sun Feb 21, 2016 7:59 pm
Posts: 4
Location: Rhode Island
88 Fourwins 205 sundowner 4.3 omc cobra 4bbl won't rev past 4k unless I unplug the esa - then it runs strong, just won't shift...

2020 when I had the motor out for transom replacement, I fitted a new cdi esa
123-9898-P since my original hadn't worked for awhile.

2022 I finally finished my project and tried to do some boating but couldn't go over 3500 rpm in the water. Tried tune up, new fuel since the boat sat 2 years, eventually put it on the back burner.

2023 installed new carb - no change. That is when I realized I could duplicate the concern on the trailer. I also found that if I disconnected the 2 pin connector for esa the boat ran great. Unplugging just the switches doesn't help. Contacted CDI (now they charge $35 for 30 mins of advice), they said sounds like a bad esa module, too old to warranty, good luck. They also recommended switching to a cdi 123-9800. I ordered one and installed - no change. Then I swapped in my original ign coil I had replaced years before and it seemed somewhat better. I figured maybe the replacement coil had some resistance issue (cdi says they need 3 ohms) and I gently used the boat a few times - stalled a few times idling in gear, didn't like to go fast...

2024 - I really want to be able to buy replacement coils without fear they will not work. I bought and installed pertronix unit to replace points, installed their recommended flame thrower coil 3 ohms and ran a new wire from alternator to bypass the 1.5 ohm resistor wire. Set timing to 6°. The damn boat still won't rev past 4k unless I unplug the esa. What am I missing!?? 13.5v at coil at idle, ballast wire I originally overlaid has now been cut, alternator output on orange wire is .8v higher than output at bottom post that feeds coil/esa only when pertronix is connected - maybe internal alternator issue but I think 13.5v at coil should be enough.

Maybe alternator issue? It does surge past 15v @ 800-1300 rpms. Thought about wiring alternator pos to sense as I've seen mentioned in multiple posts but I have a question about that too, the coil and esa feed off the sense side. Would I move those to the excite side, then run pos to sense?

Overstroke switch taken out of the picture with the switches disconnected?

Sorry for the very long story/ explanation but I'm at the end of my rope here. After doing a transom and stringers I really wanted to enjoy this boat for awhile...


88 205 Sundowner 4.3/OMC

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