Ok, found the other thread.

Knock sensor. neutral switch, lower unit lube level sensor.

where do I find these???? :smt021

I don't think it's the neutral switch because the alarm sound when it's in gear, but I may be wrong here.

Lower unit Lube level sensor..... where is this at?

do I even have knock sensors?

Mike

 

been reading through the repair manual this morning and there seems to be several other sensors that will generate a 2 beep alarm.

throttle position sensor, idle air control valve, knock sensor, manifold absolute pressure sensor, probably more that I didn't see yet. :smt021

But from what I gather there are 3 alarms on the 4.3 mpi. continuous is heat and oil pressure. I jumped the lube level sensor and it's a repeating beep. the other sensors generate a code on the ecm which then generates a 2 beep alarm. so it looks like I have to hook up a computer to see which code was generated to find out which sensor triggered. Not sure if swaping sensors will clear the code on the ecm or if it will just keep generating a 2 beep until the code is cleared. :huh:

(edit)
Ok, found the code log and resulting alarm listing in the repair manual. Holy bat beep. there are about 50 codes that will generate a 2 beep alarm. could be as simple as a loose connection but I'm going to have to have a computer hooked up to find the code and what set it off. :smt101

 

Since you recently purchased the boat, try and sweet talk the service manger into checking which code tripped and clear it if it's nothing to worry about. My MM dealer has done this for me for free if they happen to have another service call at my marina.

 

I had the same problem on my 8.1's. I was the O2 sensor. I had to just disconnect it until it could be replaced. The wrench indicated they were high failure items, but Searay would not replace them until they failed. I don't know if your motor is the same, but I don't think they vary that much in the Mercruiser alarm systems.

briman

 

I had the same problem recently on my 2003 320. It ended up being the IAC. First on the starboard motor, then 2 weeks later it happened on the port motor. Both motors had approx 320 hrs.

Rick