Things that make noise in the daylight?

B

BaseCampAnne

New member
Hi all,

After leaving the great Bellingham gathering I was crusing alongside Lummi Island at 6.5 knots when suddenly a screeching rhythmic noise suddenly came from the carbon monoxide monitor :!: I tried several experiments with no luck. The manual states to call 911. Well, I knew there was plenty of fresh air blowing in the front window and so I kept experimenting. That noise is extremely loud! Eventually after drifting a bit I decided to fire up the engine again and run full speed. The screeching stopped. I do not know why. Could it have been CO coming in under the bimini and into the cockpit that set it off? And why would running full speed stop it, if indeed that was what stopped it :?:

Yesterday after leaving Stuart Island the Suzuki 90 slowed, began stuttering, and then stopped several times. I checked and it wasn't an empty gas tank. I could find nothing in the "manual" I have, which is mostly an installation guide. So, it seemed time to go to the kicker. I lowered it, found the cord less than friendly, waited a few minutes tried the 90 again. It started! But what was going on :? This inquiring mind is challenged again.

Later, along Camano Island, another new noise presented itself. Not so obnoxious, but loud and puzzling :!: The sound seemed to come from the gearbox. The manual says it comes from needing oil or overheating. I was confident Sea Coaster was not low on oil and due to the chop I was not running at top speed. I tried a couple of changes, with no success. The water was quite choppy and after an uncomfortable drifting experience I started the 90 again and was shocked when the noise was gone! I have no idea why.

I had the luck of the Irish :rainbow with these 3 experiences, but still do not understand what caused the issues. I did not find references to these topics when I tried the search button.

Comments? :idea:

Of course I am going to practice more at starting the 9.9, but the other issues are puzzling me...

Thanks in advance for your wisdom!

Anne Cox
 
was the back door open? could have been station wagon effect. Does the co detector read ppm? If not get one with a dig. display to elimanate a bad detector. As for the others probally gremlins.
 
More information required...

Motor...year, hp , model

CO Detector: location, power, etc.

Kicker: year, model ...did you pull the choke out..squeeze the primer ball first...

Manuals do not replace experience.
 
Anne , the CO detector going off sounds exactly like station wagon effect. You have the back door open and probably not much ventilation from the front and the exhaust CO gets sucked into the cabin and sets off the detector. You could have opened windows up front and probably have "washed out" the CO over several minutes. At least you know the detector is working.

The stuttering of the engine?? Sounds like a fuel flow restriction or a little water in the gas possibly. How full was the tank at that point? If it was getting low you might have stirred up some junk in the tank.
 
Anne
Have had my CO detector do the same. Open your center window and dont worry. The other noices, Not to familiar with Suzukis, But could it be your alternator belt? With outboards out on the water cowling on, running at speed it is hard to tell just where a noice is coming from
Chuck
Bootleg Hooch
 
Get a second CO detector, with a digital level read out. They are relitatively cheap (Kiddie Night Hawk Model KN-COPP-B-LS) uses 3 AA batteries. Agree that it is station waggon effect. You may have also had a slight wind from aft.
 
Good info :D

I will probably purchase a different CO detector. The one I have came with the 2008 boat I purchased from Master Marine and does not have a readout.
I had all the windows wide open, and will keep the door closed next time. And yes, it is nice to know that the detector works!

There was @ 15-20% gas left in one tank and I may have had some dirt in that as you suggested, David. I did switch over to the other tank but it made no difference immediately so I moved on to another experiment. I never seem to run my tanks dry; should I be doing that?

The engines are 2008 Suzuki 4 strokes and everything had been checked out with the 100 hour check up and I had only added 4 hours of use.

I did have the choke out on the kicker but forgot to squeeze the ball. Does that have any connection to a tight cord?

I agree that experience is better than manuals! Thank goodness for you all at this site :!:

Anne
 
If the kicker is in gear, there is a default that stops it from starting, usually by not allowing the motor to be turned over. some older hondas just keep the motor kill on, when trying to start in gear. Make sure it is neutral. Ron
 
I think a Suzuki dealer can hook up a computer to the engine and get a reading if anything was going on there. I have the digital gauge. When I ran out of fuel at cruise speed the engine of course stopped suddenly from 4000 rpm to 0. Of course so did the waterpump. The engine temp went from 175 to 200 in a heart beat. My gauge told me over temp but the engine computer but the engine into some kind of "limp" mode because even after I switched tanks and restarted and the temp returned to normal, the engine would not turn over about 2500 rpm. I had to go through the ritual like you do at oil change time. After that it ran just fine.
 
I suspect you have a defective CO monitor or for some reason your engine is running rich. I run with my backdoor open 99% of the time and haven't experienced what you have in over 400 hours of operation. My CO monitor does have a low voltage alarm and went off when I had a battery problem but it's not loud as you describe. I think as suggested you should take it to a good Suzuki dealer and let them read the codes. I've had my Suzuki 90 go into the limp mode a couple times from grass blocking the cooling water intact. I can't remember but I believe there are two different limp modes one limits you to 3500 RPM and the other lower. In both cases I just shut down the engine clear the obstuction let it sit for a moment and restart.
 
To late to edit my post above but I see from your original post that your engine didn't go into limp mode (fail safe mode). So it sounds like a fuel delivery problem to me. Either way I'd let the dealer read the codes probably something very simple or as someone said just a gremlin.
 
Anne
Was thinking about your kicker motor, and though it probably is not what is happening with yours, might be something to think about. A friends brand new 8hp Tohatsu's carb float stuck open and the bottom cylinder filled with gas. I belive it is called hydrostatic lock, but any way he could not get the electric starter or rope to budge. Drained the cylinder, started right up
Chuck
Bootleg Hooch
 
marvin4239":1n1bpi86 said:
I can't remember but I believe there are two different limp modes one limits you to 3500 RPM and the other lower. In both cases I just shut down the engine clear the obstuction let it sit for a moment and restart.
Click to expand...

Thanks Marvin. This is good information. Totally out of character for me, I think I actually read my Suzuki owers manual when I got the boat. I don't remember ever reading about this in the manual. I just lucked onto a cure when I had the problem. Maybe I didn't let mine sit long enough but I had to do the reset thing to clear mine.
 
Thanks Marvin. This is good information. Totally out of character for me, I think I actually read my Suzuki owers manual when I got the boat. I don't remember ever reading about this in the manual. I just lucked onto a cure when I had the problem. Maybe I didn't let mine sit long enough but I had to do the reset thing to clear mine.[/quote]

I don't think the owners manual goes into much detail about the fail safe mode (limp mode) but the service manual goes into great detail. It's a really complex system and is activated by as I understand it either over revolution, low oil pressure or overheat. The service manual also tells you how to read the trouble codes on your tach. It's a lot more information than I'm capable of processing.
 
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