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Your timing light may not like your multi-spark and is confused.
Pull the distributor out, and put back in aligned with a different distributor tooth.
Silly question, but.... Is the notch on the harmonic balancer pulley lined up correctly? Is the scale it reads against the correct part and in the right place?
I have had this exact same problem before and the distributor was off a tooth. Pulling it out moved the adjustment from maxed out to centered. play with it a bit. pulling it out should allow it to move half the adjustment.
Have you verified that TDC mark is actually TDC?
I am a little stumped. Do you have a different distributor you could try? Has the block or head been decked?
Okay, another long shot in the dark. Are your distributor cap and rotor OEM? Did the manufacturer somehow build them wrong? How about the ECM? Is it good?
Well.... I am running low on ideas. If I were you I'd be pretty tempted to get out the parts cannon and replace the Distributor cap and rotor with Denso parts, though I'm not hopeful.One thought. Are you sure the Crane multi-spark system isn't causing issues? like, really, really sure? Is there a quick way to hook up a single-spark system to check your timing? Because the more I think about it, the more I wonder if that is the cause of your woes. You may already know all or most of the following, but for the sake of thouroughness I will write it anyway.A timing light has a big copper coil that clamps around your spark plug wire. When a spike of voltage travels down said spark wire, this causes a little voltage spike inside the timing light's pickup coil, which is then amplified to trigger a transistor (basically a super-fast super-duper relay for this application) to make a bulb go all blinky blinky. There is probably some amount of "blurring" of this voltage spike between being picked up and turning into a flash of light, some maybe intentional and some accidental.What concerns me is that if you have three spikes in quick succession (because of a multi-spark system) these could well be "blurred" to look like one looong spark with an average position much later than the actual time of the first spark. I suppose a timing light could even exist that detected not the spike itself, but the abrupt voltage drop at the end of the spike, with a very real possibility of giving poor readings on a multi-spark system.I don't know the details of your multi-spark system, and I can't begin to guess at the details of what might be in your timing light that might make or break it's ability to read a multi-spark ignition accurately. But I would love to see what you got if you checked timing with factory Toyota ignition system or a multi-spark compatible timing light
If I were you I'd be pretty tempted to get out the parts cannon
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