Intermittent alarm

[WYTige?]

The boat is a new to me 2006 22Ve with the MP 5.7L. The boat has been running excellent at anything below 4,000 rpms. Anytime I get the boat up towards 4,500-5,000 rpms I get the loud alarm like you get before you start. All gauges appear to be normal, temp never gets above 175 and oil pressure never above 65-70 psi. When I shut it down and restart, the alarm goes away unless I run the throttle up. I have cleaned the screen at the trans cooler and replaced the impeller to no avail.

So before I take it to the dealer, two weeks out, is there anything else I'm missing? Anything a guy with a little bit of know how and liquid, Diet Pepsi courage can't solve?

[steelerskbb]

The boat is a new to me 2006 22Ve with the MP 5.7L. The boat has been running excellent at anything below 4,000 rpms. Anytime I get the boat up towards 4,500-5,000 rpms I get the loud alarm like you get before you start. All gauges appear to be normal, temp never gets above 175 and oil pressure never above 65-70 psi. When I shut it down and restart, the alarm goes away unless I run the throttle up. I have cleaned the screen at the trans cooler and replaced the impeller to no avail.

So before I take it to the dealer, two weeks out, is there anything else I'm missing? Anything a guy with a little bit of know how and liquid, Diet Pepsi courage can't solve?

We had a similar issue with our 2006 20v. Ran the codes and it ended up being the potentiometer (spelling). Good to go now!

[WYTige?]

That sounds a bit like the flux capacitor. Had to Google that one but it gives me something to mention when I take it in. Thanks for the reply.

[c_hotshot]

To me - the temp is a getting towards the high side. My boat stays right around 149-151 all day.

[WYTige?]

The only thing I haven't done is pulled the trans cooler and back flushed it. I supposes I could try that. It's at least something I can do. I wish I had a code reader to try and eliminate some things.

[WYTige?]

Well, took the boat to a dealer and the mechanic was only able to slide me in to check the codes. After clearing the codes, non of which the mechanic said were related to the alarm, I was on my way. Got on the lake today, ran it to 4,700 rpms amd back came the alarm. It went off today only under heavy load and anything above 4,300 rpms. The mechanic put water to it and ran it to 4,500 rpms and couldn't get the alarm to go off. He said everything looked normal. He said the next step would be to put it on the water and hook the computer up to see what happens. Any advice???

[TWOhunter]

My 2005 22v was having some problems when I took it to lake after they said codes were clear. I requested to always lake test it and they do now and then they can I.d. the issues. I recently had a over-heating issues and sluggishness at about 10 mph about 1/3 of the time. They changed plugs and thermostat and all fixed now.

[WYTige?]

The thermostat might be the issue however, one would think that after the alarm goes off there should be a code pooped that would let me know what is going on. 226 views to this thread and not a lot of replies it must be something quite abnormal.

[WYTige?]

Back at it!

Well, I didn't get my issue solved last fall so I'm back at it. A few weeks ago I was in Denver and the good folks at WWS pointed me in the direction of the knock sensor. I was able to get the boat out of storage last week and today I pulled the knock sensor on the starboard side.

The following pictures are before and after shots after using some PB Blaster and a little wire brush to clean it up. Not sure if it will solve my problem but it did look like the sensor has seen better days. Anyone have much experience with these?

I'm also curious to know if it should go in further (last pic)? I have it hand tightened in the picture but I know it won't go more than a 1/4 turn past that. Not sure if that could be an issue as well?

Supposed to get 1-3 inches of snow tonight so won't be on the water for a few more days at least.

[masongardner]

Snow in the forecast doesn't mean anything, we're going to pueblo on Saturday rain or shine. Good luck with the alarm, hopefully it gets fixed quick. Warm weather is coming!

[lee]

You need to clean the threads with a tap. They are rusted and will not let the sensor thread in further.

[WYTige?]

^^That is going to be my next step. Boy would I be tickled if it's that easy.

[lee]

1/4" Pipe thread is the size.

[chpthril]

This old style single wire knock sensors ground to the block through the threads.

[boatwakes]

I know I was working with you on this last year and sorry you haven't found it yet but I have some more Intel for you. First off, the knock sensor will not trigger an alarm but instead tell the ECM to retard timing so that won't be it. However, we have found the ECM will throw a code and alarm for low fuel pressure as well as the items we discussed last year. See if you can borrow a fuel pressure gauge that reads above 60 psi and test it under the same conditions.