I just pulled and replaced all 8 plugs. 2 came out perfect (not rich or lean.) 5 looked rich (black.) 1 looked rich and the ground electrode was bent almost to the point of touching the center electrode. This was the #8 plug (back left from inside the boat.)
I ran the engine for 30 seconds between doing the right and left plugs. After I finished with the left plugs the engine wouldn't turn over. I pulled the new #8 plug out and the engine turned over. Assuming it was just flooded I replaced the plug and tried again. Again it wouldn't turn over, just a very quick ert sound before nothing.
Can the piston or a valve actually be hitting the plug? If so, I'm afraid to ask, what does this mean for me?
Am I just flooded and turning it over without the plug in didn't clear it?
The engine is the pre-vortec 350 (thunderbolt.) New plugs are NGK BR6FS. Old plugs are NGK UR5. From what I could find the UR5's are exactly the same size, just an older or automotive only plug.
I ran the engine for 30 seconds between doing the right and left plugs. After I finished with the left plugs the engine wouldn't turn over. I pulled the new #8 plug out and the engine turned over. Assuming it was just flooded I replaced the plug and tried again. Again it wouldn't turn over, just a very quick ert sound before nothing.
Can the piston or a valve actually be hitting the plug? If so, I'm afraid to ask, what does this mean for me?
Am I just flooded and turning it over without the plug in didn't clear it?
The engine is the pre-vortec 350 (thunderbolt.) New plugs are NGK BR6FS. Old plugs are NGK UR5. From what I could find the UR5's are exactly the same size, just an older or automotive only plug.