Loren Warner
Cadet
- Joined
- May 13, 2007
- Messages
- 14
Removed plugs on 1997 mercruiser 7.4L, carburator, generation VI. Engine has not been run since fogging for layup last year. At that time the engine ran good. The insulator tip on every other plug in its firing order has black dry carbon. They don't look bad but maybe a little rich. The insulator tips on all other plugs is nearly like new, only slightly brown. What could possibly be going on with the ignition system that would cause every other plug to differ equally? Firing order is 1-8-4-3-6-5-7-2
8 light 7 dark
6 dark 5 light
4 dark 3 light
2 light 1 dark
Fwd
8 light 7 dark
6 dark 5 light
4 dark 3 light
2 light 1 dark
Fwd