DukeDelago
Seaman Apprentice
- Joined
- Jul 17, 2009
- Messages
- 46
I've used an in line ignition spark tester to verify that all 4 plugs are getting spark on my 1990 force 120. My question is, does this necessarily mean that the plugs are firing, or just that they are getting power from the coils. The engine starts and idles fine, but maxes out at just over 4000 rpm and has a very hard time planing. At WOT it will occasionally "blip" up a few hundred rpm on the tach, but never gains full power. Is it possible that I have a faulty plug, or should I be looking elsewhere in the ignition system? If I remember correctly, the CD modules fire multiple times per cycle at low RPM, but only once above 3500 or so. If this is the case I am wondering if I am only getting actual spark sometimes on one cylinder, but that it's only noticeable at high rpm where there isn't multiple sparks on the power stroke. Any suggestions would be helpful, it would be nice to know if I am even in the ballpark on this!! Thanks all.