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Starboard Engine Won't Start At Idle - Engine Bus Fault

Steffenpharai

New member
Hi all, my Sea Ray has twin 4.3L Mercruisers with Alpha Gen 2 drives. Took her out for about an hour today to mainly practice docking and leaving my marina so alot of time was spent at low RPMs.

When I start the boat, the starboard smartcart sensor shows Engine Bus Fault and once in a while I see Fuel Level Fault. This was occuring before I took the boat out.

Once I got back to the marina, after shifting from forward to reverse pretty fast, the engine stalled. We were able to restart it but it stalled again a few minutes later at low rpm.

Now I can't start the engine. If I throttle it, it starts fine. If I leave it in neutral, it cranks but doesn't turn over.

Any help would be greatly appreciated!
 
Hi all, my Sea Ray has twin 4.3L Mercruisers with Alpha Gen 2 drives. Took her out for about an hour today to mainly practice docking and leaving my marina so alot of time was spent at low RPMs.

When I start the boat, the starboard smartcart sensor shows Engine Bus Fault and once in a while I see Fuel Level Fault. This was occuring before I took the boat out.

Once I got back to the marina, after shifting from forward to reverse pretty fast, the engine stalled. We were able to restart it but it stalled again a few minutes later at low rpm.

Now I can't start the engine. If I throttle it, it starts fine. If I leave it in neutral, it cranks but doesn't turn over.

Any help would be greatly appreciated!

Fixed it! Did some digging on these forums and it sounded like the IAC valve. Picked one up at a local marine store, installed it and it started right up!
 
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