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2012 SN 200 ZR 4 6.0L. 600 hrs
Just starting to troubleshoot an issue and plan to throw parts at it if it's part of regular maintenance (or they are cheap) before getting a dealer involved.
Very first time out this year when running up/down the lake the boat would have a very quick (and very, very short) drop of, say, 200 RPMs. It was so short I couldn't even hear it, but it almost felt like there was suddenly a bit of resistance to moving forward if that makes sense. Sort of like if you were driving a car and just for a very split second you let your foot off the accelerator and then put it right back on. Perhaps said another way, instead of being pinned into the driver seat from the force of moving forward, just for a split second you wouldn't feel pinned. The problem went away by the time I was out next time around so I wrote it off as bad gas.
This weekend the problem reoccurred. My driver said he also heard a few "pops" from the engine. My driver isn't a mechanic, but he's not a moron either and very specifically didn't call it a backfire. From the rope end I didn't hear (or feel) anything odd. I hopped in and drove it. It is a bit rough out of the hole and at various RPMs (20 mph, 34mph, 36 mph) it's doing that same thing from the first time out. I didn't hear any "pops" again, though.
FCC filter and water/fuel separater are 3 yrs old. Plugs have 150 hrs on them. I drained the FCC and didn't find any water. Running at the right temperature. Run 89 reformulated non-ethanol. ZO on/off makes no difference. Over the last two years I have had a few codes thrown for the throttle position sensor, but only when I'm idling in/out of gear. I've delayed replacing it so far since the ECM needs to be flashed for a new one.
I'm going to focus first on fuel, then ignition, then other stuff. If you guys have any other things to add to my list it would be much appreciated.
Fuel/Air
Ignition
Other
Any other things to add to the list?
Just starting to troubleshoot an issue and plan to throw parts at it if it's part of regular maintenance (or they are cheap) before getting a dealer involved.
Very first time out this year when running up/down the lake the boat would have a very quick (and very, very short) drop of, say, 200 RPMs. It was so short I couldn't even hear it, but it almost felt like there was suddenly a bit of resistance to moving forward if that makes sense. Sort of like if you were driving a car and just for a very split second you let your foot off the accelerator and then put it right back on. Perhaps said another way, instead of being pinned into the driver seat from the force of moving forward, just for a split second you wouldn't feel pinned. The problem went away by the time I was out next time around so I wrote it off as bad gas.
This weekend the problem reoccurred. My driver said he also heard a few "pops" from the engine. My driver isn't a mechanic, but he's not a moron either and very specifically didn't call it a backfire. From the rope end I didn't hear (or feel) anything odd. I hopped in and drove it. It is a bit rough out of the hole and at various RPMs (20 mph, 34mph, 36 mph) it's doing that same thing from the first time out. I didn't hear any "pops" again, though.
FCC filter and water/fuel separater are 3 yrs old. Plugs have 150 hrs on them. I drained the FCC and didn't find any water. Running at the right temperature. Run 89 reformulated non-ethanol. ZO on/off makes no difference. Over the last two years I have had a few codes thrown for the throttle position sensor, but only when I'm idling in/out of gear. I've delayed replacing it so far since the ECM needs to be flashed for a new one.
I'm going to focus first on fuel, then ignition, then other stuff. If you guys have any other things to add to my list it would be much appreciated.
Fuel/Air
- Replace FCC filter
- Replace spin on filter
- Clean flame arrestor
- Replace MAT sensor
- Add injector cleaner to tank
- Add fuel dry to tank
- Switch to 91 non-ethanol
Ignition
- Replace plug wires
Other
- Replace throttle position sensor
Any other things to add to the list?
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