Then you have isolated the circuit that is feeding B+ to IGN. As mentioned, you can put it back in, and disconnect things on that circuit one at a time.
Not that money grows on trees or anything, but Cartech will still make you a manifold and they will make it T3 or T4. I talked to them recently. They still do intercoolers, but switched it from 8 to 6 inch core. That was also a part of the talk. I think it is better to have a dedicated manifold...
Most people here look at it from the wrong angle. When the engine gives due to pushing it too hard or down right negligence in the tune, what do you want to shoot out of the block? A composite headgasket, or a connecting rod.
The fuel pump is designed to operate at battery voltage. It is run through a resistor to slow it down at low loads. The CSI has no input in this operation.
F and G are both twin cam. The F head has one cam gear and and a two gears inside the valve cover so they both rotate. The G head has two cam gears and are then time independent of each other. And one other thing, the 1MZFE head in the late 90's Camry easily outflows the 1JZ and 2JZ heads. Just...
Why? Weight transfer happens when you accelerate and decelerate. It doesn't change no matter the suspension. The suspension keeps the contact patch while the weight shift happens. Changing what the engineers already figured out is not a good idea. Especially on this car.
On top of the front...
You might consider not attempting repairs to th EFI system if you don't know what the main input into it is.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=94
If it was an engine problem, it would vibrate in neutral or gear. So stop with the 2500 RPM, and say what speed. And then if the speed is the same in the different gears. And it should be.
Clear the codes. Pull the EFI fuse for 30 seconds then drive it. Your information does not add up. The biggest issue is the 52, and the PCM will operate in a safe mode with reduced timing and a richer mixture. It might be an old code, as you haven't indicated that problem driving. Unless you are...
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