99 MerCruiser 454 L29 in Carver 406 - Failed to stay running then OK

[kgarguilo]

The Tech finally came. Here is the report. NO ERROR Codes.

DIACOM MARINE SERVICE REPORT

07/14/2023 15:54:14

1. VEHICLE CONFIGURATION

Cust. Name: 406 carver
Engine Make: 454 merc
Engine Serial No:
Model Year:
System Type: GM-DELCO MEFI 3 MODE 1 MASTER

2. PERFORMANCE DATA

Parameter Description Value Unit

Engine Speed.......................................... 0 RPM
Calibration Checksum............................... FE28 HEX
Desired Idle Speed.................................. 681 RPM
Engine Running Time................................ 0.00 min
Battery Voltage................................... 13.00 VDC
Engine Hours..................................... 855.58 hrs
ECT Temperature.................................... 81.5 °F
Total Trouble Codes................................... 0
Manifold Air Temperature........................... 86.9 °F
Fuel Pump Output.................................... OFF
Baro Derived From MAP.............................. 29.0 inHg
Malfunction Indicator Lamp........................... ON
Manifold Absolute Pressure......................... 29.0 inHg
Check Gauges Lamp Output............................ OFF
Injector Pulse Width............................... 10.7 ms
Low Oil Pressure Input............................... ON
Spark Advance....................................... 0.1 DEG
Engine Knock Detected............................... OFF
Knock Retard....................................... 0.00 DEG
Low Oil Pressure Telltale............................ ON
Throttle Position................................... 0.0 %
Overheat Telltale................................... OFF
Throttle Sensor Voltage............................ 0.61 VDC
Shift Interrupt Input............................... OFF
IAC Position...................................... 141.0 #
Low Voltage Telltale................................ OFF
Base IAC Position................................. 141.0 #
Cause For Power Reduction............................ No
IAC Throttle Follower............................... 0.0 #
Rev Limiter Status.................................. OFF
Fuel Flow Rate..................................... 0.00 GPH
Warning Buzzer Output............................... OFF
Desired IAC Position.............................. 141.0 #
Diagnostic Input.................................... OFF
Lanyard Stop Status................................. OFF
Troll Mode Input..................................... ON
Low Oil Level Input................................. OFF
Gen Warning 1 Input................................. OFF
Gen Warning 2 Input................................. OFF
Low Oil Level Lamp Output........................... OFF
Gen Warning 1 Lamp Output........................... OFF
Gen Warning 2 Lamp Output........................... OFF
RPM Based Output.................................... OFF
Low Oil Level Telltale.............................. OFF
Gen Warning 1 Telltale............................... ON
Gen Warning 2 Telltale............................... ON
Low Fuel Pressure Telltale.......................... OFF
Power Enrichment.................................... OFF
Decel Enleanment.................................... OFF
MAP Sensor Voltage................................. 4.67 VDC

3. TROUBLE CODE STATUS

Current ECM Codes

I pushed both reports to One Drive link is below:
https://1drv.ms/f/s!AsUXzq27eR2fgrtFI3T ... A?e=qY1vtb

[bud37]

That is all nice but the engine is not running....did you get a scan with the engine/engines running and up to operating temp ? You need to watch what takes place as the throttle is opened and closed/ changing position....then you can see if and why the stall is happening and compare one engine to the other.

[kgarguilo]

That is all the tech did. I have the software arriving on Monday along with the dongle for my engines. I will read how to do it on Monday and try to get a new report on Tuesday.

[tomschauer]

Without the engines running, and then again running under load, that didn't help you at all.
If i am not mistaken, the mefi 3 will only store critical faults, and will even lose those after power is removed.

[kgarguilo]

Ok, the files are uploaded. One Drive link - https://1drv.ms/f/s!AsUXzq27eR2fgrtFI3T ... A?e=4Gwt3C

1) GM-DELCO MEFI 3 07 17 2023 PORT 12 56 34 (Sitting at Dock)
2) GM-DELCO MEFI 3 07 17 2023 Starboard 13 05 04 (Sitting at Dock)
3) GM-DELCO MEFI 3 07 17 2023 starboard under way 13 16 57 On the way out for a ride No wake Markers are out a bit
4) GM-DELCO MEFI 3 07 17 2023 port back to port 13 28 24 On the way back in through docking

[bud37]

Have you had a look thru this thread from a few years back ?

Fyi......I had a look at your data......will spend some more time looking, All my mefi stuff is gone now.....I wonder what the actual target IAC spec is at idle....I won't guess here.

viewtopic.php?f=8&t=3692

[kgarguilo]

Postby bud37 » July 17th, 2023, 4:44 pm

Have you had a look thru this thread from a few years back ?

Fyi......I had a look at your data......will spend some more time looking, All my mefi stuff is gone now.....I wonder what the actual target IAC spec is at idle....I won't guess here.

viewtopic.php?f=8&t=3692

I believe / think the IAC is fluid / variable as I watched the desired IAC Position go up and down on RPM increase and decrease. I made MP4 files of each "rec" file with the RPM, IAC Position, desired IAC Position, and Battery Voltage with zoomed in metering on those fields.

OLD Thread - Very Interesting thread more to look at.

[bud37]

Here some more, seeing as how you are starting down this road to enlightenment... ....yes the IAC is fluid , but there needs to be a starting point to allow the idle air control and the timing to control the idle speed and engine stall on return to idle and when placed in and out of gear at idle. It also has a relationship with the throttle body plate fully closed gap.It is important that plate and bore are clean and not gouged/sticky.

https://www.motooff.ru/assets/files/doc ... _alb_1.pdf

[kgarguilo]

That is a very cool PDF. Thanks, Love tech reading.

[kgarguilo]

UPDATE: Today in following the thoughts from bud37, km1125 & tomschauer & maybe more, I swapped out the Charles Charger 5000 60 Amp for a new Victron Skylla IP65 (3 Output) 70 Amp Charger with a NEMA 2000 connector. I hooked this unit up on Saturday and got it up on my Garmin Glass via N2K connection. I understand I can likely use One helm on the Garmin to hook directly to the Victron for more and better info. Waiting for clarification from the Victron rep.

In watching this overnight the charging going on and this morning the progress of amp draw getting down to a real low level (0.9-1.6) of amps going to the battery banks, we took her for a ride only today. No anchoring as that will be the next test, next week. I noticed right away my Garmin Unit voltage connection where it was 11.9V before I started the project to now 13.9V. I indeed to lose just under .5V from the battery bank to the helm over the haul of the electric wire. Now that I see the battery voltage from the charger on the Garmin the above voltage drop is obvious. That being said the voltage I am seeing is between 14.4V - 14.7V. I watched the charger when I selected battery 2 for my primary for the trip and started the engines the charger stopped charging that bank. This feels like it may do the trick since the computer software did not yield anything conclusive.

Postby bud37 » July 17th, 2023, 5:27 pm
Here some more, seeing as how you are starting down this road to enlightenment... :-D ....yes the IAC is fluid , but there needs to be a starting point to allow the idle air control and the timing to control the idle speed and engine stall on return to idle and when placed in and out of gear at idle. It also has a relationship with the throttle body plate fully closed gap.It is important that plate and bore are clean and not gouged/sticky.
https://www.motooff.ru/assets/files/doc ... _alb_1.pdf

bud37 that document has great info, I have been reading through it and highlighting areas that apply to my engine type and striking through the ones that do not for an easier find if more information is needed.

Thank you all for the continued help and support.