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2003 Malibu Wakesetter Monsoon 335 Spuddering Engine (Misfire maybe?)


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Hi we have a 2003 Malibu Wakesetter with a Monsoon 335. We recently changed out the fuel filter and did an oil change. The following weekend we headed to Lake Powell and drove a few hours to where we were camping. We camped by Dangling rope marina. The next day we filled up with gas at the Marina and noticed that the engine started making a funny noise. It was like the exhaust was popping and it was pretty consistent. We thought maybe it was bad gas. After that trip we put 91 in and an octane booster and since then have put in fuel injector cleaner. But the problem has stayed and has seemed to worsen. Now the popping is a lot closer together. IT sounds like it is coming from the exhaust and has effected the performance a lot now. Has anyone had this problem before? Does anyone know what could be wrong with it. The engine has ran strong up to this point.

Your help is greatly appreciated!!

Thanks Ben

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Hi we have a 2003 Malibu Wakesetter with a Monsoon 335. We recently changed out the fuel filter and did an oil change. The following weekend we headed to Lake Powell and drove a few hours to where we were camping. We camped by Dangling rope marina. The next day we filled up with gas at the Marina and noticed that the engine started making a funny noise. It was like the exhaust was popping and it was pretty consistent. We thought maybe it was bad gas. After that trip we put 91 in and an octane booster and since then have put in fuel injector cleaner. But the problem has stayed and has seemed to worsen. Now the popping is a lot closer together. IT sounds like it is coming from the exhaust and has effected the performance a lot now. Has anyone had this problem before? Does anyone know what could be wrong with it. The engine has ran strong up to this point.

Your help is greatly appreciated!!

Thanks Ben

When was the last time the cap, rotor, plugs and wires were changed? Sounds like it is just time for a basic tune up if it is missing.

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When was the last time the cap, rotor, plugs and wires were changed? Sounds like it is just time for a basic tune up if it is missing.

We did the basic tune up at the beginning of the season. They are all new. And it was running great until we got the gas at the marina. And now its gone down hill. its like vrooom pop pop pop vroom pop vroom. ITs hard to explain sounds. I read on here somewhere someone mentioning water in the gas tank. Do you think this could be the cause?

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Yes it most likely is water in the tank if you have done the tune up just this season. Take out the rear middle seat, tilt the front of the boat up and take off one of the large line's to the tank. Then put a wounder pump in the tank and pass the hose through the drain hole into a gas can. Take some out and see if you have water in the tank.

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Yes it most likely is water in the tank if you have done the tune up just this season. Take out the rear middle seat, tilt the front of the boat up and take off one of the large line's to the tank. Then put a wounder pump in the tank and pass the hose through the drain hole into a gas can. Take some out and see if you have water in the tank.

Will do thank you for your help. Do you think the product Heeter will take care of it? It is suppose to get rid of the water somehow...

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