Engine Stalls at idle - Mercruiser 5.0 MPI

[chyanke]

Check to see if you have an oil drain hose attached to the oil pan. Mine did and I just shoved the hose out the drain plug hole and empted into a bucket. No mess inside the boat. I think they came from the factory with them. I have not worked on a 280 but with the smaller engine room than my 300 you may have not seen them. I had to get down low in the eng room to find them.

Indeed, as I stated in the question, item 1)...I have the remote drain hose line but instead of routing it out the back bilge drain hole and waiting an hour for it to all drain out, I rigged up my electric Jabsco to the end of the line and it sucks out the oil in under a minute. Even with this method, I still only get out 3.5qts.

 

[Bucit]

I have 4.3l's and have tried it both ways. My motors hold 4 quarts and when using the Jabsco electric pump I only got about 3.5 qt's out. When I used the drain hoses I first ran the motor, then tried draining it. My boat sits on a lift too. Even after I brought the motor to it's normal operating temperature if flowed very slow, the oil wasn;t hot and I did not get all 4 qt's out either. I look at it this way, if you do normal oil changes a little left in the motor along woith new oil will not hurt it. When was the last time you heard soemone blow a motor because they mixed 3.5 qt's of new oil with .5 qt's of used oil?

 

[Aero Nautical]

Back to MPI stall issue... Were there audible beeps prior to the engine stalling. My port engine stalled once off plane heading into the docks. I was getting a 2 beep audible alarm every minute or so prior to that. I was able to refire with some throttle but it died once back to idle. The same thing happened after letting her sit for 40 min. Refire with advanced throttle and subsequent stall below ~600 rpms

The silver lining... Backing into a slip single handed with one engine: check.

 

[my DOG HOUSE]

That is exactly how it happened to me. Bad IAC.

 

[Alex D]

The two beeps that will sound once each minute indicate that the PCM has detected a fault in one of the electronic components. Oil and temp warnings are a constant beep and potential engine shut down. Two beeps each minute and a stalling engine at idle is a sure fire indication that your IAC is done and needs to be replaced. I get the whole marinized component eetc. but in this case the Mercruiser IAC is the same as an automotive Delphi CV10103 IAC. If you scratch the black paint off the OEM Delphi number sticker will resurface. I just changed mine today. Still had the OEM Merc IAC that was 9 years old and the IAC muffler was also clogged. I bought the IAC from Amazon for $48 (incl. Prime shipping). Cheapest Merc is $100+ and they are IDENTICAL!

For those who are intersted ... the IAC Merc uses is not a GM IAC. It's a Ford component and used on 2002-2003 Ford Windstars. GM IACs have four wires and the Ford/Merc unit has only two.

Here are some part numbers and costs:

- IAC Vavle Idle Air Control, Mercury - Mercruiser 862998 - Need 1 - $116.00+
- OR: IAC Valve Idle Air Control, Delphi - CV 10103 - Need 1 - $40-$50

- Gasket, Mercury - Mercruiser 27-863112 - Need 1 - $1.22

- Muffler Iac, Mercury - Mercruiser 35-863829 - Need 1 - $1.50

 

[Lulu3]

Hi: I am REALLY hoping that this experienced group can help. I have a port engine that - in terms of behavior - seems to match the descriptions in this thread perfectly: engine dies when at idle, whether in gear or in neutral. Does a slow-death, and while it does, the management system seems to be trying to keep it running (RPM's rev to maybe 1K, but ultimately as soon as it tries to settle at ~700, it just slowly does off. And seems to be running rich during this process). From the posts in this thread, seems to be the IAC valve. But, I cannot find the IAC on my engine (which is a 2001 Mercruiser 5.0 Litre EFI Digital Ignition, from what is printed on the air cover. Serials are worn off the cover ID plate). I have had a mechanic trying to figure it out maybe 5x times...and no resolution (he never mentions the IAC). But he says that he tried swapping all of the control modules to the Stbd engine...and says it ran perfectly. So he thinks he ruled those out. But it sure seems like either the IAC or a Control Module problem. BTW - with the drive engaged, it will NEVER run faster than 2500 RPM. But it will rev to 3500+ with no load on it. I attached a series of images of my engine and air cover, hoping that you could direct me to either the IAC or a control module...or other solution??? Thx so much. Richard A

 

[Little Ducky]

58505[/ATTACH]

I swear someone just had this same issue. Info below.

 

[Little Ducky]

This was the thread:
http://www.clubsearay.com/index.php?threads/5-0-efi-swap-out-to-carbs.88397/

This was the fix:
"ITS FIXED.............. took all your advise and fired my old mechanic and bowed to the marine mechanic gods and got one. After about 1 hour it was fixed. Old mechanic put distributor back in and was 3 teeth off. Timing was all out of wack and wires on that motor were in the wrong firing order. Runs now like a beast."

I hope it helps.

 

[techmitch]

Hi: I am REALLY hoping that this experienced group can help. I have a port engine that - in terms of behavior - seems to match the descriptions in this thread perfectly: engine dies when at idle, whether in gear or in neutral. Does a slow-death, and while it does, the management system seems to be trying to keep it running (RPM's rev to maybe 1K, but ultimately as soon as it tries to settle at ~700, it just slowly does off. And seems to be running rich during this process). From the posts in this thread, seems to be the IAC valve. But, I cannot find the IAC on my engine (which is a 2001 Mercruiser 5.0 Litre EFI Digital Ignition, from what is printed on the air cover. Serials are worn off the cover ID plate). I have had a mechanic trying to figure it out maybe 5x times...and no resolution (he never mentions the IAC). But he says that he tried swapping all of the control modules to the Stbd engine...and says it ran perfectly. So he thinks he ruled those out. But it sure seems like either the IAC or a Control Module problem. BTW - with the drive engaged, it will NEVER run faster than 2500 RPM. But it will rev to 3500+ with no load on it. I attached a series of images of my engine and air cover, hoping that you could direct me to either the IAC or a control module...or other solution??? Thx so much. Richard AView attachment 58505

Your IAC is dead center of your last pic. #3375

 

[Espos4]

Agree. Circled it Right here

Although this isn’t a “Ford” type IAC.
This is a “GM” type. Probably from late 80’s - early 90’s fuel system.

These throttle body fuel injection systems are from that era.

 

[Robert McDonough]

I have the same issue but it also started happening at cruising speed any suggestions
Thanks
Bob

 

[Espos4]

I would be best to start a new thread with you issue.