Mercruiser 4.3 backfires in rough water

[Valiant]

Seems to run fine in smooth water, but when its start bouncing, it sputters and backfires.<br /><br />I attributed it to old gas the first time, but I have gone through several tanks of fresh this season. Only in rough water. When its smooth I can run WOT with no problems.<br /><br />Suggestions from the learned?

 

[JB]

Re: Mercruiser 4.3 backfires in rough water

First suggestion: Post your question in the correct forum.<br /><br />This is for mercury outboards. I will move it to I/O and Inboard

 

[Valiant]

Re: Mercruiser 4.3 backfires in rough water

A thousand pardons...Thanks JB

 

[rodbolt]

Re: Mercruiser 4.3 backfires in rough water

second is clean the fuel system from the tank pick up to the carb.<br /> good luck and keep posting

 

[Rickles]

Re: Mercruiser 4.3 backfires in rough water

Maybe you're making the rev. limiter cut out the eng. if the prop spins free.Smooth water your prop is staying in and grabbing air in rough water.

 

[Valiant]

Re: Mercruiser 4.3 backfires in rough water

Thanks guys. I'll check for water in the gas.

 

[DaveM]

Re: Mercruiser 4.3 backfires in rough water

Something similar happened to me once. I replaced the anti-siphon valve and all was good.

 

[Chris1956]

Re: Mercruiser 4.3 backfires in rough water

Valiant, It sounds electrical to me. Are there some ignition or alternator-related wires that could bounce around during rough water usage? I would look for some partially broken wires or missing insulation on the Ignition coil, Ign sensor (on distributor), starter solonoid or alternator.

 

[Valiant]

Re: Mercruiser 4.3 backfires in rough water

Good suggestions. I'll track em all down.