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The MIL illuminates: 1) Key on, engine off. Lamp check. 2) Key on, engine running, and a hard fault occurs. 3) Key on, engine running or not, system in diag mode. 4) Key on, engine running, and rpm falls below 200. (Same lamp check as #1)

Not to nitpick but the light isn't supposed to come on in ACC.

Connect the rear speed sensor to clear up a code 51? Are you serious?

One way a lot gets in there is by punching a clogged screen out...

^ As I understand it these controllers only display VTA. When associated with the TPS 51 is IDL related. VTA is only relevant to code 41 although there is one cause of 41 that can involve IDL.

Thanks. Yeah, she looks good for 50. As sweet and devoted as can be too. My 20 year old stepdaughter is also a looker. Gorgeous, tall, slim with long black hair. Damn smart too. On her way to becoming a physician. Ukraine is full of beautiful women. When there I still spent a lot of time picking...

Half Scott and half French Canuck. She's Russian. Ukrainian actually. Same difference...

As they say, crude but effective. I see why it was hard to fit though. My 87 had nothing under the AFM except a small harness that had to be slightly moved. I'm guessing that relay is for the cds fans since mine was where your filter is. Leave it to Toyota to move stuff around. For the flopping...

^ This. I used the Magnefine under the AFM but a small remote mounted spin-on can also be used even if it's not a true hydraulic filter. One place for it is up front in the return line. A engine oil filter will do although I prefer to use a Trasko in such applications. Anything is better than...

I've said it before but a filter in the return line permanently ends that problem. It also makes everything in the PS system last almost as long.

Say what?

Are you asking about the housing or Karman sensor? The housing will be larger. The sensor is irrelevant. It's not a MAF btw...

Front VSV is for the FPU system. No harm in fixing it but not the cause of your problem. You mean rich misfire. The O2 sensor doesn't have enough authority by itself to cause that. In fact with it disconnected and everything else working right the engine will run smoother and cooler but burn...

One of the inputs that can cause 51 is the neutral safety switch. Do you have still have the auto ECU in the car? Did the code show up after you swapped in the 5 speed? If so that could be it. You can't just jump the connector where the switch used to be or you'll lose cruise control because...

It does. All important EFI wiring goes directly to the ECU for reliability reasons. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=48 Check the continuity of that yellow/green wire. Better still (and a lot easier) measure the voltage on it at the TPS connector with...

Fix the O2 sensor and then verify the engine is in fuel control. See the TRSM for details. If it isn't fix it so it is. Then report back with a better description of the symptoms. "Loaded up" isn't that helpful.

I said it wouldn't cause his symptoms. A 60% fuel economy reduction? I dunno what your issue was but it couldn't have been O2 alone. Not on a stock engine. Have a wideband? If so run the engine at 2500 rpm and disconnect the sensor. Then short the input to ground. Follow that by applying 1...

I was trying to be kind. That thing is a POS. Better choices on ebay. Look at Hantek, Owon, or Atten. Or Google those brands. Made abroad but will do the job. I think the lithium powered Hanteks are kinda nifty for the price but don't own one. My current DSO is a mid-level Tektronix used for...

No. An open O2 input alone can't cause that. It's the law in fact. You have other problems. Course, that doesn't mean known broken stuff shouldn't be fixed.

I suppose it'd be OK to learn on but don't expect much. It's a toy and like all cheap test gear will be quickly outgrown as you learn the value of having such stuff, assuming it even lasts that long.