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2000 Mercury 150efi looses fuel injection pulse when hot

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2000 Mercury 150efi looses fuel injection pulse when hot
Submitted: 1 year ago.Category: Boat
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Answered in 1 minute by:
3/31/2016
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3,994
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is***** will assist you.

Would you please post the serial number of the engine?

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Customer reply replied 1 year ago
Ot101902
Customer reply replied 1 year ago
Boat sat for 2.5 years inside never had any issues before this changed all filters,tuned up,batteries,etc before use after the long storage first time out ran for about 15-20 minutes and cut off did some testing and found out that it lost fuel injector pulse after it cooled for about 15 min started again and made it back to dock
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

How are you testing for the pulse?

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Customer reply replied 1 year ago
Noid light and dry run off of aerosol can and run great long as I provide fuel
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Are you running the engine with the front of the air handler off to get to the harness to install the noid light?

Are you sure that you are not losing fuel pressure?

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Customer reply replied 1 year ago
No connected noid light at round harness plug at side of air handler and had fuel pressure gauge on test port at same time of testing
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Is your Noid light a 4 pin? Mine is only a 2 pin.

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

What was the fuel pressure when you tested it?

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Customer reply replied 1 year ago
Mine is also a 2 pin there are 3 signal wires one to each injector I checked each one individually while engine would not start I checked my method while engine was running to verify signal with noid light on each injector
Customer reply replied 1 year ago
i switched control module one time while engine would not start and immediately gained injection pulse and engine started ran for awhile and cut off with same problem
Customer reply replied 1 year ago
Don't recall off the top of my head have it written down somewhere but I started there at the beginning of all of this before I got to this point and pressure was always good tested several times again just to monitor
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago
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Customer reply replied 1 year ago
Won't allow me to use your link as a guest to log in to verify part 28 Mercury schematic just call it control module has 3 plugs and a ground
Customer reply replied 1 year ago
That works yes part 28
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, so it ran for a few after changing that? Did the doner engine run when the part was replaced back on it?

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Customer reply replied 1 year ago
Didn't have a doner engine marine friend of mine had another new one on shelf he let me try same results actually set a bag of ice on controller once and it started just so you no engine temp never exceeded 170 under load in test tank mostly stayed 150 to 165
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Does the alarm on the engine beep when you turn the key to the ON position?

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Customer reply replied 1 year ago
alarm system is in working order
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Great. Your question says that you have already replaced the trigger, is that correct? If so, was the replacement new or used?

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Customer reply replied 1 year ago
It was a new part
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok,

How long ago was that?

What did CDI say about the ECU? Was the Fuel injector driver bad?

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Customer reply replied 1 year ago
Trigger coil was the last part I replaced during this process cdi could not tell me what they replaced only that it was tested before I got it back i have been looking for used ecm to try but this one is not very common
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

How have you been searching? That ECU was used for some time

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Customer reply replied 1 year ago
Internet and local ,have to run for now will get back with you later today thanks for responses
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Your welcome.

Where are you located in the USA? i am in AR. I have a day job in a repair shop and will come back online after 6PM CST tomorrow. Talk to you then.

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Customer reply replied 1 year ago
Ok Charles back online
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Me too

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Customer reply replied 1 year ago
Have any new thoughts on my problem
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Where are you located?

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Customer reply replied 1 year ago
Maryland
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, thats a bit far.

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Customer reply replied 1 year ago
I'm on east coast quite far away from you
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Rereading our responses, W

When you tested with the noid light, were you plugged into the harness from the engine, or the one going to the injectors?

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Customer reply replied 1 year ago
Back probed while connected and functioning
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

What color of wire did you use as the hot wire? There are 4 wires there.

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Customer reply replied 1 year ago
I believe 12volt power in that plug was red trying to find schematic that I documented what I did now
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

The red is the hot wire. The ECU controls the ground through the other colors.

Do you have a multimeter?

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Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Disconnect the plug to the injectors, then using the meter, test the resistance between the red and the other colors going to the injectors. What do you get for the resistance on each?

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Customer reply replied 1 year ago
1.1-1.0 on all 3
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, they are all good.

When the engine will not start, do the gauges still work?

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Customer reply replied 1 year ago
I checked voltage at engine it was good
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

On the purple wire? Not a red?

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Customer reply replied 1 year ago
Just general voltage at solenoid
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, Can you run the boat, make it fail, and when it will not restart, check the voltage on the back of the tach on the purple wire to the black wire, without touching the key first?

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Customer reply replied 1 year ago
What should it be
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Battery voltage on the purple when the key is in the on position, but I dont want you to turn the key off when the engine dies, leave it on, and test the voltage first.

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Customer reply replied 1 year ago
I'm talking to my buddy that has test tank tomorrow I was going to ask him then when I can use it again won't be this weekend I am going out of town,trying to get as much info and things to try before I get there to run this thing
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

I would try that, and if you are losing power to the purple wire, replace the key switch or test for power on the back of it as well before turning the key off.

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Customer reply replied 1 year ago
I can start with that have not checked anything like that yet
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

This is a really odd issue. I have not seen something like this in the field in 11yrs. But it could be just a key switch causing the problem.

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Customer reply replied 1 year ago
I no I have stumped several people with this problem even people who work on these everyday / I feel it is something simple I am just not seeing engine has been extremely trouble free for years until it sat
Customer reply replied 1 year ago
It will probably be a week or two before I get an opportunity to test again as soon as I do will let you no results / if you think of anything in the mean time please let me no. thanks again
Customer reply replied 1 year ago
Also temperature seem to agrevate problem. / the hotter it is outside the easier it is to get the problem to occur
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Ok, try two tests. One with the temp senders plugged in and another with them unplugged. You may have a bad sender.

If you know someone with a scanner, you would need to have it hooked to the engine during the test as this ECU does not store codes once the key it turned off.

I do work in these everyday. That is my day job, I only do the online thing at night and on the weekends.

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Customer reply replied 1 year ago
Ok the guy with the tank has a scanner I will try that as well and will let you no results as soon as I test thanks for the help
Marine Mechanic: Charles, Marine Mechanic replied 1 year ago

Your very welcome. If you do so on a Sat. After you reply to me, if you want to switch to the phone, simply accept the offer that I have sent to you.

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