big cahuna
New member
have 1997 crusader 454 efi's. strb engine pops or backfires at high rpm. computer checks ok, not a lean problem, springs and valves all good, plugs and wires replced...this was the case all last season as well. HELP!
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Boat has been serviced at same location since new. They checked for lean problem first and stated no problem. Swapped computers, replaced springs and valves, rebuilt carb replaced plugs and wires.
You could also have a broken valve spring. THAT can be determined by pulling the covers and taking a good look.
Jeff