496 ho alarm before start up ( any suggestions)?
 

Changed,oil,raw water pump.fuel filter ,gear case oil,added anti freeze,changed plugs,new serp.belt,before ever starting - alarm sound ,2 sec beeps ,constant ,,,,,any how started boat seems to run fine, garden hose hookup,little more water out thru hull exh. On starboard side,didn't let get above 150-160,then I shut it down ,,,any help would be great:angry-smiley-038: Ps ,noticed lights on vapor sensor not lit ,tried it hooked up, disconncted no difference ,green light on fire ext system,

the 2 seconds alarm is normal.

Thanks for reply zx14k,alarm stays beeping during motor start& while motor is running ,constant 2 sec. Beeps ,starts beeping as soon as key turned on,,,,,,,,,,,any thoughts,?

Put her on a code reader just to play it safe, is this an injected motor im guessing??

an old boat i had did that after i changed drive oil. Turned up it built pressure or something when i refilled. I cracked the fill cap, it let off pressure, and that took care of it. Just a idea.

check your drive fluid, or 2 beeps ever 60 sec. low water pressure sensoe on sea water pump,

2 beeps every 60 seconds could be IAC valve. I believe low drive oil, water pressure, oil pressure gives you a constant beep. I had to replace the IAC on both my engines at 155hours on port engine and 165 hours on starboard engine. Put it on a scanner, and that will tell you. Do it before replacing anything else.

Yep. Sounds like an IAC went bad

I have read recently about a lot of IAC problems with the 496, I have twins in my kachina with about 140 hrs are they just junk equipment or could it be where they are mounted?

If you plan on keeping the 496 for any length of time you should bite the bullet and get a scan tool or diag software. It will pay for itself.