I just got my boat (22' Regal Valanti 220, Mercruiser 5.7L, Alpha One) out on the water for the first time this season today. Things started out great, then after a while I started having a problem, and I was hoping someone might be able to help me out.
When I was at a higher throttle setting (3500-4000 rpm), the motor would start to lose power intermitently and drop RPM by 200-300 rpm. If I backed down a little, it would stabilize. Pushing the throttle up again would cause the motor to hesitate - WOT would result in rpms bouncing between 4200 and 2500 rpm. As time went on, the condition became a little more pronounced, eventually leading me to go back to the launch at 2000 rpm because the surging would start at anything over 2500. Stopping and letting it cool off didn't seem to have any effect. Starts up quick, idles smooth. Runs OK in neutral, just not under load.
Any ideas what would cause this? All gauges look good, oil is full and clean. New water separating fuel filter installed end of last season, gas has Stabil added during winterization.
Thanks!
When I was at a higher throttle setting (3500-4000 rpm), the motor would start to lose power intermitently and drop RPM by 200-300 rpm. If I backed down a little, it would stabilize. Pushing the throttle up again would cause the motor to hesitate - WOT would result in rpms bouncing between 4200 and 2500 rpm. As time went on, the condition became a little more pronounced, eventually leading me to go back to the launch at 2000 rpm because the surging would start at anything over 2500. Stopping and letting it cool off didn't seem to have any effect. Starts up quick, idles smooth. Runs OK in neutral, just not under load.
Any ideas what would cause this? All gauges look good, oil is full and clean. New water separating fuel filter installed end of last season, gas has Stabil added during winterization.
Thanks!
.....