Posting this for a friend.

Is there anyone who might have a list of possible causes for an alarm on a 6.2 Liter Mercruiser (2004). It is not a constant alarm but is a beeping alarm. Engine is having idling and throttle issues.....

Low hour, unabused engines owned by a friend's father.

There has to be a listing that shows what will throw alarms, or codes out there??

I believe there are 4 alarm possibilities:

1.) IAC (Idle Air Control) failure
2.) Drive oil level too low
3.) Oil pressure too low
4.) engine temp too high

In the early hours of our 6.2 on the sea ray we had problem with an idler valve. The boat would idle rough when not under load. When under load it would just die. Couldn't do anything. Merc mechanic hadn't even heard of an idler valve previous to fixing this. Not sure what all was involved in the repair, but they had it fixed by the next weekend. It was a 2003 boat.

After a little bit more research, I found:

Constant tone alarms are for:
1.) engine coolant temp overheat,
2.) low engine oil pressure,
3.) engine overspeed,
4.) exhaust manifold cooling temp overheat
5.) sea pump PSI low

Constant beep alarms are for:
1.) low outdrive lube level.

Two Alarm beeps every 60 seconds are for:
1.) Faulty cam,
2.) IAC,
3.) MAP,
4.) MAT,
5.) knock sensors.
6.) open/short in the engine cooling temp circuit
7.) open/short in fuel injector wiring circuit,
8.) open/short in oil PSI circuit,
9.) open/short in exhaust manifold cooling temp circuit,
10.) open/short in sea pump circuit,
11.) open/short in throttle position circuit

IAC valve! 6.2 is Notorious for IAC failure. 2 beep alarm every 2 minutes. It sits on top of the intake manifold. Takes approx 5 minutes to change and comes with a new gasket. New IAC is unpainted. From Mercury they are black. The 6.2 normally carries a 2 year warranty so if under 2 years old take it to a merc dealer. If over 2 go to advance auto and pick up the IAC, they can cross reference this # 862998. It's about $32.00 at Advance. $109.00 Merc Price.

More than likely, it's the IAC, but there is no way to know for certain without putting it on the Rinda computer scanner.

I have one, and I rent it out.

Thanks guys - appreciate all the info....

I have passed it on....

Would that ref # for the IAC work if the engine is an 2003 350 MPI? I am also getting 2 beep every minute or 2 minutes...did not time which.

Just had same problem with mine last weekend!
2 beeps about every 2 mins.
Had codes pulled and it was a code 152 which is IAC output.
Turns out the IAC motor burned up and blew out the end cap.
Mine is 350 mag.

Going to try it out tomorrow and see if it is fixed for sure.

I have the same issue (2nd time). I am having problems finding this thru the local auto parts stores. Does anyone have any idea what year/model the car is that might use this same IAC? Thanks for you help.