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SIKSUKR · 08-18-2015, 01:43 PM

I didn't reread this thread to see if you did this but here is what a friend discovered on his 454 based in Hampton this weekend. They had similar issues and had drained the fuel tank, changed the fuel filter, changed plug wires, coil, and put a rebuilt carb on. No luck. They brought in a tech and he was starting to do a compression test and there was the problem...A cracked spark plug. The crack was barely visible but thats all it needs to short. It took a few minutes under way to clear the carbon or whatever from that cylinder but now she purrs. FWIW

08-18-2015, 01:43 PM	#17
SIKSUKR Senior Member Join Date: Apr 2004 Posts: 5,075 Thanks: 215 Thanked 903 Times in 509 Posts	I didn't reread this thread to see if you did this but here is what a friend discovered on his 454 based in Hampton this weekend. They had similar issues and had drained the fuel tank, changed the fuel filter, changed plug wires, coil, and put a rebuilt carb on. No luck. They brought in a tech and he was starting to do a compression test and there was the problem...A cracked spark plug. The crack was barely visible but thats all it needs to short. It took a few minutes under way to clear the carbon or whatever from that cylinder but now she purrs. FWIW __________________ SIKSUKR