Greetings! I have a 2007 270 SLX with the 8.1L Mag 496 DTS. 290 hours. Original owner.
Took it out this afternoon on a short trip at slow speed (< 10 mph). Turned it off and sat in the middle of the lake and ate dinner for about 1/2 hour. Started right back up and started heading home…. 5 mph the whole way. About 10 minutes in, it stalled out of nowhere. Wouldn’t re-start. Batteries strong and sounded like it wanted to turn over but didn’t. Tried for about 15 minutes. While the tow boat was on the way I took the throttle out of gear and pushed it up about half way and tried to start it. It fired up. When I pulled back towards idle, sounded like it would stall so pushed it back up. Put it gear and drove around for a bit and it was fine. Headed back to the dock (not going too slowly) and got it in the slip. Didn’t stall. Sat in the dock for about 10 minutes with it running at idle and no problems. Turned it off and on a couple of times and no problem.
Searched the forum and google searches and saw a post about IAC valve - which looks to be an easy/inexpensive fix. Said it was a classic problem on mercruisers but not sure if mine even has it (apparently 8.1S definitely has it - saw a YouTube vid). I guess it could be a million problems (water in fuel?) but any thoughts from the experts?
Took it out this afternoon on a short trip at slow speed (< 10 mph). Turned it off and sat in the middle of the lake and ate dinner for about 1/2 hour. Started right back up and started heading home…. 5 mph the whole way. About 10 minutes in, it stalled out of nowhere. Wouldn’t re-start. Batteries strong and sounded like it wanted to turn over but didn’t. Tried for about 15 minutes. While the tow boat was on the way I took the throttle out of gear and pushed it up about half way and tried to start it. It fired up. When I pulled back towards idle, sounded like it would stall so pushed it back up. Put it gear and drove around for a bit and it was fine. Headed back to the dock (not going too slowly) and got it in the slip. Didn’t stall. Sat in the dock for about 10 minutes with it running at idle and no problems. Turned it off and on a couple of times and no problem.
Searched the forum and google searches and saw a post about IAC valve - which looks to be an easy/inexpensive fix. Said it was a classic problem on mercruisers but not sure if mine even has it (apparently 8.1S definitely has it - saw a YouTube vid). I guess it could be a million problems (water in fuel?) but any thoughts from the experts?