alam sounding poor idle

[davidsauto]

I have a 2002 22i type R Tige boat
I would like to know if anyone has had a problem with an alarm sounding with no signs of any problem. Oil pressure, water temp,charging systems all appear to be fine.
Supply water pump was replaced at the end of last season and I have removed the hoses from the trans cooler no debris was found. I have not checked the fuel pressure as of yet but will this weekend.
The boat has had a complete service at the first of this season plugs,wires,cap,rotor and all filter and fluids. I known the boat has a 350 mpi engine and I am very familiar with this type of fuel and computer systems in the automotive world. I can pin test all of the sensors if nessasary but I am not sure what all the alarm system is monitoring. One other problem that has just started is that at idle the engine has started stalling. l have checked the throttle plate for carbon but it was clean. It acts as if the idle air control valve is not responding quick enough. But the engine runs great under all other throttle.

[SPBFAN]

How about when it is cold does it run Ok? It really sounds to me like you need a Diacom to check the system.

[davidsauto]

It runs good cold and no alarm sounds until I run the engine pulling wake boarders. As for a Diacom to check the system I assume this is a scan data tool for boats to check for codes in the ecm and also for computer data. Will this tool also check for codes set in the alarm portion of the system. I am not sure how advanced a boats computer system is.

[R&T Babich]

It runs good cold and no alarm sounds until I run the engine pulling wake boarders. ...

This sounds like dogbert's problem with low fuel pressure at heavy load or high speed. His fuel pressure regulator was not working properly and cutting off the higher pressure fuel flow needed at high demand. Does the alarm only go at those conditions? Ours has 25-26 psi of fuel pressure with ignition ON, engine OFF. I'll know what it is at speed on Sat. The fuel pressure sensor is on the inside-rear of the left fuel rail. The regulator is buried down by the pump. Your engine may have an MEFI-3 like ours, but might have an MEFI-4. My guess is your getting a code 62. To read the codes you'll need a Mercruiser Scan Tool. You might fine the manual at this link interesting - http://www.rinda.com/acro/Merc_manual_v5.pdf

[davidsauto]

Thanks for the mercruiser web site alot of interesting info. I am from East Texas and there are no dealers in our area which I would trust with my boat so I am going to find a scanner to buy so that I can diagnoise my own computer system. Anyone know where to get one?

[SPBFAN]

You can buy the Diacom system at http://www.rinda.com/marine/marine.htm. I am looking into the system and then leasing or renting it out to whom ever needs it. I will just ship it to them.

[chpthril]

I would check basics such a fuel pressure, etc, before buying a scan tool. Not sure if that yr/eng has a low water pressure sensor or not.

[davidsauto]

I would be interested in renting a scanner from you if this is something that is going to happen in the not to future. I do plan on checking fuel pressure this weekend but I would still like to find out what all sensors are monitored that will sound the warning alarm?

[dogbert]

This sounds like dogbert's problem with low fuel pressure at heavy load or high speed. His fuel pressure regulator was not working properly and cutting off the higher pressure fuel flow needed at high demand. Does the alarm only go at those conditions? Ours has 25-26 psi of fuel pressure with ignition ON, engine OFF. I'll know what it is at speed on Sat. The fuel pressure sensor is on the inside-rear of the left fuel rail. The regulator is buried down by the pump. Your engine may have an MEFI-3 like ours, but might have an MEFI-4. My guess is your getting a code 62. To read the codes you'll need a Mercruiser Scan Tool. You might fine the manual at this link interesting - http://www.rinda.com/acro/Merc_manual_v5.pdf

That's what I was going to suggest also. I had the exact same symptoms. My mechanic told me that eventually it would have stopped running altogether.

[davidsauto]

Does anybody know of any engine specification literture for fuel pressure koeo and koer. tps,map,iat, ignition timing,octane and any other specs for my 2002 22i?

[dogbert]

Octane is regular unleaded (87). There's a sticky on the General Technical infoforum for Mercruiser Engine info.

[Tincup]

Mine did the exact same thing last year. It ruined my whole weekend. I am from Abilene, so I took it to tige, and it was a oil pressure sensor. It cost about $ 40.00.

[Tincup]

Also, mine would run for 30 sec., alarm would go off and it would bring it to an idle. You could restart, and it would run for an additional 30 sec. Does yours have any of these symptoms? I have a 21 I type r.

[davidsauto]

I dont known about the thirty second time but the sysmtom appears to be the same. Did tige find your problem by scanning the computer? and if so do you know if they pin tested the sensor or checked it by the code number set in memory?

[R&T Babich]

Mine did the exact same thing last year. .... it was a oil pressure sensor. It cost about $ 40.00.

Do you have the part no. for that sensor?