Audible Warning System

[KJM813]

2004 Sundeck 5.0 Bravo III. I am getting an intermittent audible signal (buzzer) . Every two minutes it sounds twice. Oil pressure is good, temp. is good and lube resevoir is above mark. Boat starts fine and runs fine.
Tried disconnect on leads from lube tank but it still sounds.
Any help or suggestions appreciated.

 

[Presentation]

Connecting a scan tool would be needed to confirm the issue with certainty.

My guess would be a bad IAC. The Mercury smart craft system sometimes can sense a issue before you can.

The problem is getting a engine scan from certified dealer costs more than fixing the problem if you do it yourself. It could be another issue and not be the IAC. Given your lack of symptoms and boat age, without a scan, the odds of it being the IAC are about 75%.

Try www.boats.net or just shop around.

Pricing from Boats.net
803149 VALVE, IAC = $72.24
863112 Gasket = $ .91
863829 Muffler Iac = $ .92

$ is USA dollars



Best suggestion for the "2 beeps" is to have the dealer/shop read out the error log with a scan tool to see what is generating the error condition.

Here are the codes:

I’d change the IAC , IAC gasket, IAC muffler filter + clean the flame arrestor.

An IAC (idle air control) is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body.

Pay your mechanic about $300+ to do it for you or do it yourself and do a better job for about $100. It’s less than a one hour project the first time you do it and will leave you feeling you know your boat better.

The IAC controls the air flow at idle speed. A failed IAC causes the boat to not be able to idle.



Change your IAC, under $100, easy DIY job.

Also change the gasket.

As long as you are at it, get a new IAC muffler filter and lets make sure the Flame Arrester / Air Filter is clean.



Parts you will need:
- IAC Vavle Idle Air Control, Mercury - Mercruiser 862998 1 $72.24
- Gasket, Mercury - Mercruiser 27-863112 1 $.91
- Muffler Iac (filter), Mercury - Mercruiser 35-863829 3 $.92
- Shipping ground = about $10.
- one spray can of carburetor cleaner, any brand. Wal-mart has this for about $2

Tools you will need:
- Open end wrenches, size #10 or #11 metric to remove and reinstall the flame arrester / air filter
- Allen wrench set to remove and reinstall the IAC
- Small needle nose pliers to remove the old IAC muffler filter.
- 2 gallon Bucket to wash the flame arrester
- boat wash or any liquid detergent to wash the flame arrester
- hose with running water to wash the flame arrester




The above costs are from boats.net I am not associated with them so feel free to shop around. The costs are only to give you one example so you know what to expect.


Remove your flame arrester part #24 / air filter. To do this remove engine cover knob #28, engine cover #27, (3) stainless nuts M6 #26, cover mount bracket #25 and then the flame arrestor / air filter #24

Under the flame arrester and inside the air intake "THROTTLE BODY ASSEMBLY" part #1 is a mesh filter called a IAC muffler filter. It is shoved in a little rectangle. Pull this IAC muffler filter part #6 out then replace with new IAC muffler filter. It may look black and be hardily together if you have not changed it in a few years. You may need a small needle nose pliers to pull the old one out. Push the new one in by hand using your fingers.

On top of the engine is the IAC. It’s also under the area of your flame arrester / air filter but not inside then air intake. If this is your first time changing it, it will be painted back just like everything else. Your replacement part will most likely not be black, it will be shinny metal.


Unplug the wires at the IAC tip then remove 2 Allen wrench screws part #17, take off the old IAC part #16, make sure you have removed the gasket part #15, install the new IAC and gasket.


If you have not cleaned your flame arrester / air filter part #24 this year you may as well do this at the same time. Buy a can of carb cleaner, about $2 at Wal-mart and with the flame arrester / air filter part #24 removed and away from your boat spray the flame arrester / air filter part #24 with carb cleaner. Use the entire can turning the flame arrester / air filter as you spray it then rinse with water, wash in soapy water in the bucket, rinse again, shake it to get it mostly dry, let it dry the rest of the way in the sun, reinstall.

Go for a test ride and let us know how it goes.


PS: I carry a spare IAC, gasket and IAC muffler / filter.