No, you unplug the EFI fuse so you don't spray fuel in the cylinder while you test the cylinder compression. Liquids don't compress.
I agree, make sure the head gasket its good, then perform all maintainance. Timing belt, tensioner, fuel filter blah blah blah.
Then get a turbo back 3" exhaust, and coilovers. Get the best your money can buy for a supra, don't cheap out.
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