2000 4 Stroke Mercury 40hp No Spark #2 cylinder

[dmwarnke]

Hi
I see no solution for a couple of people with this same problem, even when they threw two
new ECM's at it. I've tested everything I can test and everything is good. Even if I wanted to go to replacing the ECM they aren't available new, so that would be a crap shoot. Has anyone seen this
or have any ideas? Thank You

 

[Faztbullet]

Does it have one coil per cylinder or 2 cylinders per coil?

 

[dmwarnke]

Does it have one coil per cylinder or 2 cylinders per coil?

It has three coils total, one per cylinder. Swapping a good coil to #2,still no spark. I've read you should disconnect the good one's, one at a time also and see if the dead one comes back. It does not. The ohms test on the primary is
at the high end of the range on all the coils and I was thinking of replacing all of them.

 

[Faztbullet]

Flip #2 and #3..if problem follows CDM, if not most likely stator

 

[dmwarnke]

Flip #2 and #3..if problem follows CDM, if not most likely stator

I said I did that and there was no change. The stator tests good. I guess I just need to replace it because the tests they have in the manual obviously don't work. From what i've seen in other people's experience with the same problem I may have to replace every part and it still won't run.

 

[Dave1027]

Have you tried testing with a DVA meter?

 

[dmwarnke]

Have you tried testing with a DVA meter?

I have not, I don't have one. I've seen mention of them but I'm not even sure what they are.

 

[Dave1027]

A DVA is a voltmeter that measures voltage peak to peak. The stand alone meters can be expensive but I have seen adapters for sale cheap on Amazon that are used with standard DVMs, converting them to DVAs.

 

[dmwarnke]

A DVA is a voltmeter that measures voltage peak to peak. The stand alone meters can be expensive but I have seen adapters for sale cheap on Amazon that are used with standard DVMs, converting them to DVAs.

I built a DVA and tested the Stator charge coil and that passed. The Primary coil test i'm not sure. It's says to use an Orange wire, there is no Orange wire.

 

[Dave1027]

I don't have the answer for that one but how were you able to build a DVA?

 

[dmwarnke]

I don't have the answer for that one but how were you able to build a DVA?

It's on this forum. It is very simple to build. I need to get a set of piercing probes to do more testing. Unlike the resistance tests where you can disconnect and probe you need to get readings while everything is connected.

 

[Dave1027]

My guess is it's wanting you to test the output from the switchbox to the primary side of each coil.

 

[boscoe99]

Very easy to convert RMS voltage to peak voltage. Just simple math.

What is the complete engine ID?

 

[dmwarnke]

Very easy to convert RMS voltage to peak voltage. Just simple math.

What is the complete engine ID?

OT232114 2001 40ELPT 4S

I don't know why or where I need to convert rms voltage to peak voltage
to troubleshoot my problem?

 

[Dave1027]

Very easy to convert RMS voltage to peak voltage. Just simple math.

Then why don't the manufacturers simply state their test voltages in RMS?

 

[Thirsty Endgrain]

Do you have the FSM? I can't help you with this problem specifically, but on my engine ('02 4 stroke) under certain fault conditions it will only fire two of the cylinders. It's possible (but I'm guessing) that your engine might cut out #2 in a fault condition, and the no spark is a signal from the ECM that will only resolve when the fault is taken care of.

I suggest getting an FSM off of eBay and going through its troubleshooting steps. The factory manual is quite good.

 

[dmwarnke]

Do you have the FSM? I can't help you with this problem specifically, but on my engine ('02 4 stroke) under certain fault conditions it will only fire two of the cylinders. It's possible (but I'm guessing) that your engine might cut out #2 in a fault condition, and the no spark is a signal from the ECM that will only resolve when the fault is taken care of.

I suggest getting an FSM off of eBay and going through its troubleshooting steps. The factory manual is quite good

Do you have the FSM? I can't help you with this problem specifically, but on my engine ('02 4 stroke) under certain fault conditions it will only fire two of the cylinders. It's possible (but I'm guessing) that your engine might cut out #2 in a fault condition, and the no spark is a signal from the ECM that will only resolve when the fault is taken care of.

I suggest getting an FSM off of eBay and going through its troubleshooting steps. The factory manual is quite good.

I do have the Factory Manual

The stator voltage at the green/white and the white/green is approx 270 to 290 vs 250 to 330 in the manual, in spec but low. The primary at the coils is 175 to 275 vs 250 to 320 in the manual, i would say out of spec at idle. It passes an ohms test.

So how do you know it's the stator vs the rotor being an issue? Or can that low voltage on the primary side of the coil be something in the ECM?