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Originally Posted by lethalwithasupra
...don't let a second hand car yard to a compression test on a supra. please. i work up the road from one. just don't.
  ... and it'll be the guy with the sign who does the job. |
I agree 100%, and I'll take this advice one step further. Since most courts regard any used car transaction as "as - is ... buyer beware", YOU are responsible for the accuracy of the compression test figures. In other words, there may be no recourse if you purchase the car and find it needs a new/rebuilt engine a few weeks later. I'm sorry to say that I've heard back from some buyers about compression tests done by sellers and I hear things like "160s across the board". I hope it's not news to anyone that, even if that information is near-accurate, that statement alone is insufficiently detailed to give you a good indication of the health of the engine.
Imho, either you need to do the compression test yourself, or you need to pay an independent mechanic to do it (preferrably one experienced with the Mkiv Supra turbo). If you can't find anyone nearby, post here and I'll find you a Supra owner in the area who can direct you to an objective, skilled resource that can do the compression test.
Lastly, if the engine has many thousands of miles on it since the last sparkplug change, the PCV hoses get so rock hard they may have to be cut off, and the plastic coilpack connectors may crack they're removed. Either you, or the person/shop performing the compression test, should have some spare PCV hoses and coilpack connectors available just in case. Fwiw, I'd suggest you agree with the seller ahead of time that if it fails the compression test, he compensates you for the cost of any hoses or connectors that need to be replaced.