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Think in plain terms if you have to. If the engine is at 6500 rpm, and the output shaft is turning at less than 3/4 the speed of the engine, how would the shaft be spinning faster?

The Cressida had 3.91. A W58 and proper functioning intake manifold should be just fine with it.

When the exhaust manifold gasket leaks, you can usually hear a put-put-put sound at idle. It isn't very loud.

Mine was from the SVO catalog back in the day. Of course, the wheel base on the Fox is noticably shorter...

Seems like you work with electronics and should get it. Closed loop is when the computer is responding to its own control. That is done for one reason, and one only, to keep the catalytic converter in its optimum range, which is 14.7:1. You can't tune it out, it wants to be there.

Well, there isn't an oil source above the turbo to leak on the turbo. Follow the trail.

A crack in a manifold is a leak. The likely place would be the elbow/elbow gasket. It has to effect the sensor, if that is what is going on. What codes are stored?

Perhaps you have an exhaust leak upstream from the oxygen sensor. That would cause it to read lean, when it isn't. And as such, the computer will richen the mixture. The AFM can do it, if you open it up and loosen the clock spring. (Don't do it)

So, just how advanced do you think you can go with this? Program for 550, 680, 720, etc etc injectors? Fuel cut a chosen point?

Think about that for a moment Kenny.

I have one at the house that I will be installing when I get home. Plug six has oil on it.

Why are taking it out? Why do you want to get rid FT? There are MAFT-Pro threads around, they might be able to help. I don't use it.

Except cylinder head cover number 3. http://www.cygnusx1.net/Supra/Library/EPC/291220/part.aspx?S=11219

Why would you make 3 left turns to go right (wiring in a relay) instead of just continuing to pull the fuse for 30 seconds? Why are you erasing FT anyway?

Get a Napa Gold filter in place of the crappy Toyota filter made in Thailand.

Because it is leaking. A collapsed hose is becuase of depressurizing of the system. The opposite of what the cap does. To check what Mike mentioned, go to Napa buy a block tester and ask him if you can test it. When it turns color, you know there is bypass into the cooling system. Nice shell. I...

Penzoil Plantium, and it is a fraction of the cost of Mobil 1.

Do you also have the original fuel pump?