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Yeah, Cali emissions suck big time, along with so many other things in that crap hole of a state. It's why I left. You should too. The only way to kill that beast is to stop feeding it. Couple more points: 1) The engine only runs in fuel control during steady state part throttle...

A stoich feed gas into a healthy catalyst is what's needed. Unfortunately, since improper feed gas composition can render a cat useless, you may need a new one and with Cali's latest rules that can be a hassle. It's why one should never ignore problems even if the car is running OK. It's also...

The engine is in fuel control when the O2 sensor is adjusting injection duration to maintain an average stoichometric mixture in the exhaust stream. The further away from this mixture (14.7:1) the exhaust stream is the poorer is catalyst efficency. A little Googling will tell you more. Your...

Not weird. It's actually very telling. And remember, you can always spin the CPS manually...

Actually, it should run pretty well with those numbers since best power is richer than stocih but yeah, the engine is obviously not in fuel control. That said those O2 readings are a little screwy. Under those conditions they should be near zero. Might be a little misfire going on in addition to...

Not sure if serious. Besides, it's his other cylinders that stand out. It's not a 3 banger you know. The engine is toast. Since he likely spent a lot of time wailing on it I'm not surprised...

Seems pretty open and shut to me: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=21

It's not. It just appears that way. Think about it.

As I said it's all in the book: http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=5 You ought not to be using wire color anyway. Unreliable. Use pin-outs instead.

Dunno what to say. Some of what you describe doesn't make sense. For example unless the wiring has been modified you can't have "keyed power to the black/red" unless the main relay is closed yet you claim it's not.

Everything you're asking is in the TEWD and yes, IGSW must be 12 vdc when key on. It's what wakes the ECU up.

Meter it. More info than a wire :)

Igsw?

Maybe I r corn-fused but after owning the car 28 years and learning nothing about how it works you now possess a factory service manual you want others to interpret for you?

Or suprafreedom could have just read the book...

While it's true propane (or any hydrocarbon) ingested through a pirate air leak would increase rpm consider that any leak large enough to cause the problem you're having would result in a very detrimental effect on idle quality. That said there shouldn't be any change in how the engine runs when...

A flow/volume test will verify if the filter and pump are up to delivering sufficient fuel: Disconnect the fuel supply line at the fuel rail or disconnect the return hose and place the open end of the hose in a container. If you're disconnecting the return hose you'll have to attach another...

Couple of thoughts: 1) The pump and filter can easily be checked with a flow test. 2) Neither of your two mechanics nor the machine shop appear competent.

Aha, guess I must have missed that. Generally speaking my comments still stand though.

I'm aware of that Monsewer. Perhaps I'm unaware of what people are trying to accomplish here and with what. Does the primary (or primaries) remain 12volt?