Ecumaster forum

I have had major issues with my 1JZ gte vvti coils, they keep cracking up and i have had 4 sets 2 new and 2 second hand and theyve all died.

I have seen a mod to use yaris coils which are almost identical to 1g fe coils which i have spare since the engine swap.

These coils have built in ignitors and need the falling edge of a 5v sqaure wave signal, i assumed the emu would be able to provide this but i just cant find anywhere to change the signal type or how to create a signal.

Is this possible with the EMU or will i need to look at different coils or a different setup?

CHeers

You will have to change the wiring by the igniter to that the ignition signal goes directly to the coils instead of the igniter. Then just change the ignition settings to "coils with built in amplifier". I'm running the coils from a 3.5L V6 Camry, but they're the same of all of this type from toyota.

I have no igniter, i have 4 wires to the coils, negative, 12v ign switched positive and a signal wire which requires a positive 5v to trigger. There is one thats only for oem ecu.

Sohow do i wire it upto the ecu?

Sorry, when i saw 1jz coils I immediately assumed you were running an external igniter.

You have it figured out in your last post. The trigger wires go to the EMU and you just need to change the settings to "built in amplifier".

Make sure to set your dwell properly. There's ton's of information on 1zz/1nz/1mz/etc coils on google. If you killed 4 sets of coils you may be running too much dwell and overheating them.

Dwell was set by the tuner, dont know if its too high. Top of the 1jz gets very hot and could do with better cooling.Its a common problem with cracking coils with these wasted spark ones. But before i buy anymore i will try this as a cheaper option, also people have said the engine runs smoother with less drops or misses.

This is the thing, What i have wired up at the moment doesnt work, ive set emu to coils with amps. But just get random ignition sparks even when not cranking. So somethings wrong. I have +12v to the original ign switched coil wires from the loom, I have the negative wired to an engine ground, i have also tried direct to battery negative which made no difference. I have the trigger wire going straight to G9 and have also tried B8 i think. I have a coil with a old spark resting on the cam cover so i can see what its doing, Before i spin the engine over on the key, so its just in the ignition position the coil is randomly sparking. sometimes a few times a second etc. I have 9 of these coils all from working vehicles and where running fine before i did the engine swap and all of them cant have the same problem, although i have tried 4 of them.

In the emu manual the wiring shows negative switching through the emu, and a constant positive for the feed onto the old passive coils this is how i had it set up before. There isn't a diagram of how to wire up active coils, These coils need a +5v signal from the emu to trigger? Does setting the emu to coils with amps give this out put?

Coils i have need about 2 - 3 ms dweell time which i have also set.

Taken from another site:


[Pin 1] Earth / common ground: This grounds each coil to the body / earth, an electric connection to to the cam cover alone is not at all suggested.

[Pin 2] IGT / trigger: The signal wire to activate the firing of the coil, triggered directly from the ECU's ignition output. These can paired with another coil for a waste spark connection, for example using two ECU ignition outputs to run four coilpacks. See the next section for more on this subject.

[Pin 3] IGF / ignition feedback: Used by OEM ECU's to confirm the firing of the ignition coil. If a coil malfunctions the ECU will sense the lack of this fire confirmation and put itself into a fault / limp mode. This is not normally used at all with an aftermarket /stand-alone ECU and hence only three wires are used for each coil.

[Pin 4] Power (+) / ignition power: This is the main power supply for all of the coils, this power feed is activated when the key is turned to the "Ignition" position. The most common and suggested method of connection during a conversion on a four cylinder is to remove the power feed from the original single ignition coil and use it to power all four of the new coilpacks.

Are you sure you didn't mix up pins 2 and 3? The ignition signal should to to the IGT pin (#2 in pic). IGF can be left unhooked and it just gets connected to ground when the coil is fired.

Also try the test output function in the EMU interface to see if it sparks correctly. Check the spark with a timing light if you can. I used a spark plug wire that i grabbed from a salvage yard between the coil and spark plug and hooked the timing light pickup to that. If you don't have a timing light at least make sure the spark plug is grounded well, not just sitting on top of the cam cover.

my timing is normally correct, at the moment i have a different problem, i may have damaged the emu when i tried out these 1g fe coils. They are wired up to number 2 i am sure and not 3.

I have put the old coils back on which are fine except for spark leaks but i am getting a new problem, with ignition on but not starting the coils and injectors are fireing twice every few seconds, not sure if this is wiring or EMU.

Seems my wiring was correct all along, the problem i had was with a set of spark plugs that i put in last week ans have done 120miles... they had coked up because of the crap coil packs and i never bothered to take them out to check them. i was using an old cleaned up set to test everything else.

New spark plugs fixed the problem and all seems to be running fine

are you using platinum or iridium spark plugs?

copper, been told to avoid fancy ones in the jz