My 04 Suzuki df90 has a backpressure problem.
Sitting in the water or lower unit in a tub, it runs sluggish at idle and eventually dies. Above idle it seems to run fine. Let it sit a bit and it fires right back up. Sometimes get a check eng lt (3,2). I was told, maybe on this site, this pattern indicates MAP sensor.
Using water-inlet muffs, the engine runs perfect.
The research I've done suggest a backpressure issue. I don't know what could cause a backpressure problem, but I have seen mention of a blown gasket somewhere in the exhaust system. Although I can't seem to find where any exhaust gaskets might be looking at my parts book.
Oh, the engine has close to 600 hours. Only maintenance that's been done is routine. No indicators leading up to this starting to happen.
What might be the most probable cause?
Sitting in the water or lower unit in a tub, it runs sluggish at idle and eventually dies. Above idle it seems to run fine. Let it sit a bit and it fires right back up. Sometimes get a check eng lt (3,2). I was told, maybe on this site, this pattern indicates MAP sensor.
Using water-inlet muffs, the engine runs perfect.
The research I've done suggest a backpressure issue. I don't know what could cause a backpressure problem, but I have seen mention of a blown gasket somewhere in the exhaust system. Although I can't seem to find where any exhaust gaskets might be looking at my parts book.
Oh, the engine has close to 600 hours. Only maintenance that's been done is routine. No indicators leading up to this starting to happen.
What might be the most probable cause?