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MK1 1.6 1993 Megasquirt 2.5 COP install troubles!

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MK1 1.6 1993 Megasquirt 2.5 COP install troubles!

Old 10-29-2017, 01:30 PM
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Join Date: Jun 2014
Location: Plymouth, UK
Posts: 106
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Default MK1 1.6 1993 Megasquirt 2.5 COP install troubles!

Hey everybody,

Haven't posted for a while on my build thread but I've just recently got a garage again so I can continue my build, well... until my COP conversion gave me troubles that is!

So I was hoping some could help me figure out what is going wrong as I'm getting no spark at all on two different sets of Toyota Celica 1.8 COPS.

I have 12v, ground, tacho and Trigger all wired up as needed and I've triple if not more checked them, if I give the trigger wires 12vs they fire nicely so we can confirm the other wires are correct?

I've checked the resistance and everything is as you would expect and the cops do have a separate earth on the head to be sure also.

Here is where it gets interesting, I have the spark output on my Megasquirt set to "Going high" which gives a continue 5v on the trigger wires as expected all the way to the plugs for the COPS, brilliant that what I need to make them work!

BUUUUUUUUUUUUUTTTTTT, soon as I connect the coil over plugs the trigger wire loses voltage all the way to 0.6 volts if I have 2/2 on 1 trigger wire and if I connect 1/2 to a single trigger wire I end up with 1.2-1.3 volts....

Pretty sure the voltage isn't suppose to drop unless the ECU grounds the trigger circuit, so what is going on? I don't have a 1k ohm resistor on my tacho wires but that is irrelevant to the trigger wires correct?

Does anyone have any sort of idea of what I can test or settings I may need to change as the car worked fine beforehand using the stock setup with the igniter etc.

​​​​​​​Any help would be greatly appreciated, I'm pulling my hair out currently hah!
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