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You don't need an AFC with the MAFT-Pro. Stock internals will be fine. Old worn stock parts don't really qaulify as stock internals.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=31 http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=32 Before you pick up an ECU on ebay that you probably don't need, check to see if you are getting power to the ECU. It also wouldn't hurt to see if the...

http://suprasonic.org/lexusriemer/lexusnotes.html

Check and see that the brake light switch is plugged in. That is the one on the pedal. You can check to see if it closes with a voltmeter.

9.5-10.0:1

I concur. :) I think he should leave the idle alone for several days and see if the ECU can learn a new setting.

There is a code for the heater on the oxygensor. The ECU knows if the circuit goes open or short. If you don't have the code, I don't think it is an issue. Besides, I think the sometimes rough warm idle is the cause of 25 and 26 together.

I would have to look it up, but it should come on because response is slow compared to engine temps. P0300 is OBDII, random cylinder misfire, as opposed to one cylinder that is not keeping up.

When you crank the engine, do you have a good spark at cylinder number 1?

Is the oxygen sensor in the stock housing, or further downstream? 25 and 26 together can be a lazy sensor. You said it is new, so I wonder if it is heating up. I was going to say check the fuse on the heater, but the diagram shows direct control. Does your scope scale down to one second so you...

The turbo option, and that is what it is, came on the Supra in 1987 after it debuted in Jan of 1986 with a sport roof and TEMS as an option. As well as a LSD. I think ABS became standard in 1990, and the SRS airbag in 1991.

Especially when some shade tree tells people pusing in the pedal engages the clutch.

The cygnusx1 site shows left and right side as well as the acronym ARL. I don't know what that is. Are factory TEMS still available, front and rear? Champion doesn't show left and right for the knuckle, so the upper mount has to be the same 180 out.

Especially in his case.

Some diesel filters go smaller than the normal oil filter. By a lot. Like HEUI injectors. But they were also designed for less viscous fluid as you said. I wouldn't do it.

That is true of many cars. Worst car I bought was a Chevette.

I think it is on the SOGI page. Toyota did it, so can you.

14.7:1 is chemically correct, but not because the engine runs good, because the cat runs most effectively. That is why it was an incomplete statement.

That is certainly on the outer fringe, which is why it will show on Vf, when in closed loop.

What does a mechanical gauge say?