ENGINE TROUBLE

[MarioC55]

So i took the boat out this past weekend to take advantage of the nice weather and while running the boat at around 3,200 rpm i get a loud POP POP ..!!! from what the carb so i pull the throttle back and try to diagnose... no help but just to run the boat back at or around 2,200 rpm the boat ran fine all the way to the dock it did this noise in and out of gear..

the fuel filters were all replaced..

gasoline powered mercruser 260

volvo 280 outdrive

any ideas...

[Oingo]

Check you're baffle plate..................

[Weazel]

Sounds like a timing issue?

[MarioC55]

baffel plate? thats new? where would that be located? please and thank you

[MarioC55]

timing issue... so as to mean my distributer might have turned itself? single belt drive so maybe its a valve? ohh no ... ill check it soon..

[mercerm]

Condensation in the distributor cap, maybe a bad rotor and cap?

[Slinter]

I know it sounds stupid, but make sure the wires are on the right cylinders. If you mess up the order it will do the pop pop but still run.

[CaptainLeo]

I have twin Mercruiser 7.4 liters in my boat and one of my fuel pumps went out. When i was trying to diagnose the problem, I would get on the throttle and right around 3,000 rpm's, I would get a loud pop. Do you have an electronic fuel pump? That is what I have on mine.

[Spongerider]

I'd replace your fuel filter first since it's the cheapest and eaiset thing to do. I had the same problem last season with some bad gas from a extra fuel tank. Changed out the filter and it was like magic.

Good luck!

[jeff peck]

maybe old gas,make sure your fuel tank is ventalated and check your fuel lines for cracks or kinks,good luck.

[Smelt_one]

Sounds like the muffler bearing is giving out. If it's not that, then sounds like the timing (points) are screwed up.

[GLASS PADDY]

SOUNDS LIKE SPARK PLUG COOLANT IS LOW,HOW IS THE BUBBLE?