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Me thinks you are a bit confused about the purpose. http://en.wikipedia.org/wiki/Wasted_spark

If you have TE1 jumpered and the throttle is closed (IDL signal 0V) and the car speed is 0 (stopped) then timing will be set to 10 degrees. If the timing is jumping around then the most likely scenario is the IDL signal is saying the throttle is open or your jumper is not making good contact...

I would start with the wear item. Pull the IGN switch connector off and check the operation of the ignition switch with an ohmmeter. Chances are the ACC terminal is on all the time.

From the title I thought this was going to be about Bone Valley!

This shouldn't be too hard to diagnose by a competent tech. The car is running 12.3:1, so its clearly not in fuel control. Surprised it doesn't show a check engine light.

Yes, sorry, the GEs all have one knock sensor.

All 7M-GTE motors have 2 knock sensors. One is inconveniently behind the starter.

That is correct E1 is noisier than E2. The analog THA signal is referenced to the clean E2 ground. The digital Ks AFM signal is referenced to the noisier E1, since Ks has a much higher noise margin.

Ks is a digital signal, and any good designer will be careful to keep his analog grounds separate from the noisy digital grounds. Treat the "schematic" shown on the symbol as notional, it does not represent in any true way what is going on.

If you didn't resurface the block then the chances of the MHG sealing are close to nil. And the knock sensors are not active below 1600 rpm and 48% load, so any knocking at idle is from something else.

He knows that a MAF measure mass air flow (grams/s) and an AFM measures air flow velocity (L/s).

No.

I have used ATF (Dexron 3) for many years in my PS system, along with a magnefine inline filter. I suspect that any oil meeting MIL-H-5606 would be an okay substitute. Hondas are definitely not okay with ATF or regular PS fluid. They will foam like crazy and overflow the reservoir. My...

I stand corrected. My comment doesn't make sense. The LP line goes to connector B1 so as JJ points out, wouldn't be in the engine room.

That's the LP (headlights on) input to the ECU if it is a red-yellow wire.

I need to write this down to help the next guy... For code 31 replace injectors. Got it.

That is not possible. Check the wring diagram if you don't believe me. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=038

yup, the part numebr is still good. Price is a little higher $13.94 at jay Marks.

Are you trying to use the 7M ECU with the 2JZ engine? If so, I would suggest you fix the codes 21 and 31 which have nothing to do with the battery ground by the way.

http://www.supramania.com/forums/showthread.php?28771-ehh...-my-dipstick&p=381354&viewfull=1#post381354