Mariahshebah
Cadet
- Joined
- Aug 1, 2020
- Messages
- 7
So I have been having issues with my 1998 Mariah Shebah 4.3 liter Mercruiser. I will go on the lake and the boat will run fine for about 30 minutes of drive time. Usually, after pulling the kiddos tubing, I’ll beach it for an hour or so and then went I go to cruiser, it lags significantly. On one occasion, it wouldn’t even plain out. Had to wait about 10 minutes and tried it again and it plained out but the engine lagged significantly. It doesn’t sound like it is misfiring, but rather losing power somewhere. I’ll be cruising at 30mph and the engine will lag for a couple second and then kick back to normal
Power. During this time, the rpm will fluctuate between 3000 and 4200. This will occur every 10 or so seconds.
i brought it to the shop and they put it on the dyno and it said something with fuel. The changed the water separator and anti siphon value. I was excited that it was a minor fix. Well sure enough, brought it on the water and same thing. Brought it back in and dyno said morning was wrong. they checked the fuel pressure, vacuum, distributor, fluid level, etc and nothing. Gas is good and fresh, via there test. All the in line filters are clean. They took it on the lake quickly and it ran fine, which it always does at first. We got it back yesterday and brought it out today. Of course, it happened again so i videoed it and sent it to the marine shop. I fear they aren’t going to figure this out. The marine shop didn’t want to just start replacing parts they thought were the problem until the kinda knew. Does anyone have any advice. I fear they won’t figure this out and it’s frustrating. Don’t know if it’s the coil. I figured if it was the coil, it would be misfiring/backfiring, right? Maybe something to do with having a load (tubers). Seems to happen after pulling. Any advice or thoughts would be appreciated. I am not a mechanic or pretend to be one.
thanks,
adam
Power. During this time, the rpm will fluctuate between 3000 and 4200. This will occur every 10 or so seconds.
i brought it to the shop and they put it on the dyno and it said something with fuel. The changed the water separator and anti siphon value. I was excited that it was a minor fix. Well sure enough, brought it on the water and same thing. Brought it back in and dyno said morning was wrong. they checked the fuel pressure, vacuum, distributor, fluid level, etc and nothing. Gas is good and fresh, via there test. All the in line filters are clean. They took it on the lake quickly and it ran fine, which it always does at first. We got it back yesterday and brought it out today. Of course, it happened again so i videoed it and sent it to the marine shop. I fear they aren’t going to figure this out. The marine shop didn’t want to just start replacing parts they thought were the problem until the kinda knew. Does anyone have any advice. I fear they won’t figure this out and it’s frustrating. Don’t know if it’s the coil. I figured if it was the coil, it would be misfiring/backfiring, right? Maybe something to do with having a load (tubers). Seems to happen after pulling. Any advice or thoughts would be appreciated. I am not a mechanic or pretend to be one.
thanks,
adam
