5.0 Backfiring

Mark Schallip

New Member
Mar 1, 2018
13
Trenton Ohio/Barbeau Michigan
Boat Info
240 Sundancer 1999. Tow vehicle Ford f150
Engines
305 fuel injected Mercruiser w/ Alpha 1 outdrive
I have a 240 Sundancer 1999 with a 5.0 efi. with a Mercruiser Alpha 1 outdrive. The problem is backfiring. Not all the time but every so often. The more people you have in the boat the worse it is. I have replaced disc cap, rotor, spark plugs, spark plug wires, pick up in dust, fuel filter, fuel pump and heads. still does it. This is getting expensive and is frustrating. Does anyone have any suggestions?
 
Sea Ride I posted an answer on the http you posted earlier. THANK YOU SO MUCH!! The switch cured the problem. We had a great summer of boating. Due to computer and log in issues, I have not answered earlier. My mechanic thinks I am a genious. Thanks again.
Mark
 

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