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Have you tried a different igniter? The AEM doesn't like the stock multiplex one.

- Try a different CPS. Check for sync errors as you log the ignition parameters with a laptop hooked up. -Do the 2JZ-GE coil and DH61 igniter mod. Much better ignition system than stock, and it runs a lot better with the AEM box.

You are sure it is not an ignition problem?

crank injector time shouldn't be substantially different from idle pulse width at the same temperature. Use initial crank pulse to get that initial shot of fuel for quick start up.

To me, that seems like a crap ton of fuel. Remember the initial pulse is also modified by the cold start enrichment % table. I have 680cc injectors, and a 15 raw for the crank injector time (works out to around 1200 usec at 90C, and 2000 usec at 20C after the cold start enrichment)...

There you go.

I think there are a couple threads on this forum about it, if there isn't anything in the TSRM. I remember setting them quite tight.

Check and adjust the clearances between the pickups and toothed wheels inside the CPS. Also check to see if it is leaking inside, might need new shaft seal and bearing.

And bad grounds. It is a good idea to ground the case of the AEM unit to the ground wires in the engine harness as well.

Recommend you switch over to a standard 3 channel igniter like the DH61. See my guide in this forum.

As long as you replace the grounded shielding around the wires as well.

Turn off knock control temporarily and see if it goes away, and log timing sync errors to see if they are accumulating. having an error once in awhile (like 1 every minute or two) is normal. If that doesn't fix it (and you don't get lots of timing errors) it is not the harness. As long as you...

Check to see if you are recording lots of timing sync errors, and check the knock data for big anomalies (the knock control on the V1 is pretty crap anyways though) Also make sure you are not using the stock igniter - see my writeup on using the DH61. It also helps to ground the case of the AEM...

Depends if your old one is in good shape or not. Especially the shielded wires to the CPS and knock sensors.

You could use 2JZ-GE waste fire coils that are coil on plug for 3 cylinders, with the shorty spark plug wires for the other 3, this is plug and play with the DH61 and shouldn't give any issues with noise. Plus lots of spark energy.

Adjusting the CPS is usually done with the AEM to get rid of any 'stumbles'. I found it works best if they are set to full retard (HAH!), and then use the AEM set timing sync thingy to get the static timing correct.

Supras use low impedance injectors and a resistor pack. If you want to run high impedance injectors, other than making the connectors work you need to bypass the resistors in the pack by making an adapter harness where the pack plugs in. It is quite easy.

Ground the AEM case to the engine ground wires in the engine harness. Double check the ignition system wiring and AEM setup. And make sure you are using properly gapped plugs.

That is a 3 channel igniter. However, you will need to find waste fire coils that match it.

I would call it more of an aesthetic upgrade.