4 replies to this topic

[Toes In The Water]

While I was out on the lake yesterday, I noticed something that made me nervous. I was crusing at 4000 rpms and all of a sudden the rpms jumped to 4500. I dropped the throttle back down to idle checked the engine and I didn't see or hear anything out of the ordinary. Later on the same thing happened, I was crusing at 4500 rpms and again the rpms jumped to about 5000.

I did not notice anything unsually when I was slowly throttling up the entire time.

Anyone had similar issue/situation? I'm hoping its nothing serious.

[boyd]

It shouldn't happen. We had the same issue, for the first time, this summer. So I just bought a used service manual for $40. and started replacing some "sensors" per the problem flow charts. It's not easy getting parts from the web as no one stocks anything anymore so expect to take TWO weeks to get stuff. I also read up on other forums what others were doing for certain issues for this engine. Don't bother trying to get the "Digital Diagnostic Tool" as described in the owners & repair manuals as the repair shops have those which can instantly diagnos most problems plus show a history of the engine. They cost $1600. new and they stopped making those around 2006, but you might find a used one for $700. I decided to get another brand to diagnos the engine now and in the future because I want it to run good each time I take the boat out. Let the rest of us know what you figured out for this problem!

[k-dub]

Did you get any codes on the dash? I had this same thing happen when my throttle position sensor failed, the RPM's would jump without any change in throttle.

[boyd]

Sept. 15, 2012 update: As a follow-up on the RPM and other issues for our 2002 Islandia with the 240efi, I did purchase the other diagnostic tool made by RINDA TECHNOLOGIES (model #94050) and received it two weeks ago. It can diangnos many models of engines so they include the connector specific for your engine; nice people to deal with. An auto-mechanic friend (also a boater) came over and helped me run the first diagnostic test and the tool is worth the money because you will get historical data (like hours run) as well as diagnostic data (trouble codes). Some tests must be done while the engine is RUNNING, and with the jet drive you know it's better if it's actually IN THE WATER as oppossed to just being connected to a garden hose.
We bought the Islandia new in 2001 and I guessed we put about 200 hours on the engine based on how many times we went out over the years; I wasn't far off because it showed 187.5 hours. But that was broken down into hours at different RPMs and it was intersting to see we put about 60 hours at idle speed just getting through no wake zones, picking up tubers, etc.
For the trouble/service "codes", it showed a total of five codes and I need to figure out the meaning of some by reading the manuals some more and what corrections/repairs are needed. Here they are as shown on the tool screen: #104 Sea Temp Ckt Hi (active); #131 Trim Ckt Lo; #94 Pitot Ckt Lo; #82 Oil Level Ckt Hi; #75 Fuel Level Ckt Hi.
I just replaced the Port and Starboard Temperature Sensors (based on the suggestion of others on this website) and the main fuel filter (it has 4 or 5 fuel filters) didn't see any improvement in performance, but it couldn't have hurt either.
We put her in storage for the 2012-2013 winter because our season is just about over here in Maryland, and will continue the fun
next season... if the river don't rise & the Lord don't come and we can afford the gas!

[Toes In The Water]

To post an update, I did not find what the problem was during last summer.  I took the boat out of storage last weekend and I started it back up.  My friend noticed that a module was smoking so we shut it down.  Took the boat to a shop and based on the drawings I looked at, it was the rev limiter module.  The mechanic that is currently working on my boat thinks that the small diaphram fuel pump could have caused the issue with the erradic rpms.  I will post an update once I get the bill from the boat shop.

 

boyd, where did you buy the diagnostic tool from and for how much?  if you do not mind me askIng.