Here is the background....Bought a 94 Crownline 225br with a rusted up engine due to the plug being left in it, serial #OF354207. Rebuilt the engine, new fuel pump, and cleaned the carb. Finally got it started after getting the distributor lined up correctly. Brought it up to temp, oil pressure runs around 40psi at idle, compression after break-in is at 150 psi on all cylinders. My issue started after if fired the first time. It cranked fine until it started then after that it will kickback like crazy and then eventually the engine will start and run fine. I thought it was a starter alignment/flywheel issue but after two days of shimming there was no change. I had noticed that the voltage gauge would jump every time the hour meter ticked and the voltage gauge dropped while revving. I put in a different battery and cleaned the starter circuit connections with no change. Then, I hooked my VOM to the yellow/red wire to check voltage while cranking (10.3V) with the coil wire unplugged and it cranked just fine...verified with multiple attempts. Hooked the coil wire back to the distributor and it is grinding and skipping again. I got it started, checked and it is timed at 10 deg. BTDC per the sticker on the engine cover. I reset it to 8* per the manual for thunderbolt v. Pulled the coil wire again and it cranks just fine.
What I don't get is why the it will time in base mode to 8* and when returned then to normal mode the idle sounds great and the throttle is snappy. But when I go to start it, it is hard to start and kicks like crazy. When I put my timing light on it and revved up it up to 1750 rpm the timing was at 4* BTDC...it bounced around a little but for the most part it stayed at 4*. I know it won't be at full advance but it should have been off the timing mark. I unplugged the knock module with the engine off and then started it to check voltage to the module with it running and it made no difference at all, I unplugged the knock sensor and no change. When I checked the voltage at the timing lead it is anywhere from 4-5.5 but not 8-10 like it should be. It seems like the timing is getting advanced during startup...is this possible? Could it be a combination of the knock and ICM? Does the timing lead voltage have any correlation to ignition timing?
I have moved the timing all over the place and it is crazy but it will start best with no kickback and as soon as you hit the key at 8* ATDC?? Sorry for the long winded post....just trying to give all the details