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By the way, the color changes you observe between the various pieces of the interior were not there when the car was new. 25 years of sun, oxygen, outgassing and heat have faded the parts to different degrees. To make it all look like it was new isn't going to happen, no matter what you do.

"Lucky we didn't say anything about the dirty knife"

Its all in the first post of this thread.... The four sensors which assist in the various settings are:

Your parts guy ain't trying very hard.... http://www.cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?F=8715&P=1

You have multiple problems. This chart will help you identify the sensors. Your leaking sensor is for the small coolant fans down the driver side of the rad shroud. Your code 22 is from a bad ECU coolant signal. Could be the sensor or the wiring. You will need to troubleshoot. Your clutch fan...

Those wires look like the ones that go to the alternator IG L S terminals.. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=042

I may be mistaken, but the engine appears to be missing.

One man's quiet can be another man's raucous noise.... Maybe geezer is just lucky, but google poly bushing squeak and see how many hits you get. Its a problem, maybe not for everyone, but there's an awful lot of people fighting squeaky poly bushings.

You are confusing the present with the past. New Toyota engines typically use TTY bolts, but 25 years ago it was not common.

Personally, I would stick with stock bushings unless there is some really good reason you need them firmer. The maintenance hassle of poly bushings is a drag, and I only have two of them on my Lipp strut arms. I can't imagine having to deal with a whole setup in poly. For grease, use a poly...

For a long time base sweep it makes more sense to operate as a storage scope than a sampling scope. I don't know if yours has that kind of capability though.

Typically the sample length is fixed by the available buffer in the scope. So for longer sweeps the sample rate drops to prevent buffer overflow. Obviously at 500MS/s if the sample rate is not reduced the amount of data to process becomes huge over long sweeps.

What does the sample rate do as you change your time interval?

Our ECUs do not compensate for ramp rate errors between rich-lean and lean-rich sweeps. The ECU does calibrate the cross-count rate, but not balance. Just the way it is, there is only so much you can do with a 12MHz clock and 12kB of ROM.

You need to measure the switch resistance, not the voltage on the car harness plug. Unless I misunderstood your post and the disconnected switch has power, then I suggest filing a disclosure with USPTO. I suggest you have someone who knows automotive electrical check it out for you.

Because the dwell time on either the lean or rich side can be different. Its only going to be 14.7 if the times are the same, and the two slopes are identical. As noted, an air leak can cause the two slopes to differ, as can other things. Also, at idle, the ECU purposely makes the slopes...

and if that doesn't work then check the coolant temp sensor. Not too sure what you mean by it doesn't flash. It better flash, even with no codes stored. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=113

You can't, but JJ was referring to the average mixture, not the instantaneous.

The sensor measures oxygen in the exhaust stream and the reference is the ambient side of the sensor. When the mixture is rich, there is oxygen demand on the exhaust side and when lean there is an oxygen excess. At Stoich there is no free oxygen in the stream. The sensor basically read O2 excess...