Flamingomoon
Recruit
- Joined
- May 29, 2015
- Messages
- 1
currently working on mid nineties mercruiser small block. thunderbolt iv ignition with distributor mounted module. not sure what is original to boat as serial number on carb cover indicates 5l with two bbl and engine has 4 bbl mercarb. can remove wires from cylinders 2,3,5,8 with no effect. plugs are fouling. have replaced and moved everything to eliminate parts issue with no good result and have not yet found definitive test for this problem. strongly suspect module but reluctant to replace without confirmation. any known test to help isolate defective part?