davidh82
Member
Hello CSR, I am having an issue with my 'new to me' 2010 Sundancer 240 with the 5.0 MPI emission controlled engine.
The engine seems to be in really good shape, with about 133 hours. Runs great with no real issues. According to the dealer where I purchased the boat, the manifolds and risers were just replaced as a preventative maintenance item before it was resold to me.
While taking the boat out for a few hours the second weekend we had it, an engine alarm came on stating that the 'Starboard catalyst not functioning properly'. This text was accompanied by a really annoying two second beep about every one to two minutes. With my knowledge of car engines, I figured this was either an issues with the catalytic converter or an O2 sensor.
I brought the boat back to the dealer. They took a look at the boat and diagnosed a bad O2 sensor which they replaced. I was very happy with this diagnosis until the next weekend when I took out the boat and had the exact same issue!
The boat is back at the dealer today (unfortunately the boat is not under warranty but the dealer is working with us), however they are saying that the mechanic is unable to recreate the error this time.
I was just hoping to get a few thoughts on this from you guys. I have two streams of thought on this right now. My first thought was that maybe an non-catalyst compatible oil was used that has contaminated the catalyst, in which case at worst I'll have to replace a cat. I have also searched and found on here that these engines tending to have a problem with the risers being to low, allowing water to touch and damage the O2 sensor. What I'm not sure about is whether or not the alerts that people are getting in these cases actually state an O2 sensor issue. In my case, the code it is throwing specifically says that the catalyst is the issue.
In the case that the catalyst needs to be replaced, has anybody had experience actually changing one? It looks like it should be a fairly simple replacement and I don't believe the entire manifold even needs to come off.
I apologize for the longish post, this is my first post and am hoping to get more insight from you guys out there.
Other than this issue, we love the boat and are very happy with it! We purchased the boat knowing well about the stability issues that this size boat has, and we were prepared for it when taking it out for the first time.
The engine seems to be in really good shape, with about 133 hours. Runs great with no real issues. According to the dealer where I purchased the boat, the manifolds and risers were just replaced as a preventative maintenance item before it was resold to me.
While taking the boat out for a few hours the second weekend we had it, an engine alarm came on stating that the 'Starboard catalyst not functioning properly'. This text was accompanied by a really annoying two second beep about every one to two minutes. With my knowledge of car engines, I figured this was either an issues with the catalytic converter or an O2 sensor.
I brought the boat back to the dealer. They took a look at the boat and diagnosed a bad O2 sensor which they replaced. I was very happy with this diagnosis until the next weekend when I took out the boat and had the exact same issue!
The boat is back at the dealer today (unfortunately the boat is not under warranty but the dealer is working with us), however they are saying that the mechanic is unable to recreate the error this time.
I was just hoping to get a few thoughts on this from you guys. I have two streams of thought on this right now. My first thought was that maybe an non-catalyst compatible oil was used that has contaminated the catalyst, in which case at worst I'll have to replace a cat. I have also searched and found on here that these engines tending to have a problem with the risers being to low, allowing water to touch and damage the O2 sensor. What I'm not sure about is whether or not the alerts that people are getting in these cases actually state an O2 sensor issue. In my case, the code it is throwing specifically says that the catalyst is the issue.
In the case that the catalyst needs to be replaced, has anybody had experience actually changing one? It looks like it should be a fairly simple replacement and I don't believe the entire manifold even needs to come off.
I apologize for the longish post, this is my first post and am hoping to get more insight from you guys out there.
Other than this issue, we love the boat and are very happy with it! We purchased the boat knowing well about the stability issues that this size boat has, and we were prepared for it when taking it out for the first time.
