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Did you pull the EFI fuse for 30 seconds yet? What year is the car? Traction control blinking means it has a problem also. Time to check all DTCs'.

You have to check and see. Any competent front end shop can do an accurate diagnosis.

The ECU substitutes a known good value. Open and closed loop has nothing to do with it. In fact, closed loop would be better, as it gives the ECU an idea about how well it is controlling the engine. When the airflow signal is lost, a base value is used, as pointed out. The engine speed and...

I think that is the key to having the most easy going swap. They are on ebay. Rollovers and such every now and then.

And how did you do that?

Mexico is in North America... Come on now. ;)

The 5.4 can't rev? I don't know what to say. Learn a little more about it, and don't think that there is only one version, and it shares with the F-150. The LS series is a great engine. But it doesn't flow more air through the cylinder heads. Apples to apples means you have to compare the...

What kind of car? Stock 1UZ computer controls? What year? What codes? What have you checked.

So you see a slow responding low voltage oxygen sensor. What more did you need to check? See how easy sarcasm is? False air creates a drivability problem usually. You would have seen another symptom. What year is the car? You don't have a KV airflow meter?

Pull codes first. An air intake leak will do that. So will a lack of fuel pressure from heat soak vaporizing fuel in the rail.

It is not likely a charging problem, but a battery problem. Over filling it will do that. So will a sulfated battery. So will overheating it.

If you have 5 volt refrence, you don't need an ECU. That is very unlikely that you need one. It isn't a Chevy. 41 means the ECU isn't recieving the TPS signal, it doesn't mean the TPS is bad. You likely have poor wiring somewhere.

What codes? Any?

Thermostats stick closed. They have wax inside that needs to heat creating an opening.

The factory repair manuals are available new from the dealer for a hefty price. I buy mine on ebay now that I don't work at Toyota anymore. Toyota Supra repair manual? I promise if you google the picture of the book, you won't be able to validate the acronym TSRM...

At least you figured it out. Some in other communities won't ever look at the obvious. Everybody does something like that now and then.

For what it is worth, I like the 1UZFE engine very much. And projects like cjsupra90's is a great idea.

Weight loss and meeting cafe standards is why we have aluminum blocks. Not for stiffness. It is great that the alloys have been doped up so well to make them stiff though.

Who tunes at 12.5:1? Work with fuel trim, not against it, and tuning is not a problem.

I have already been through those courses. Thanks anyway. I didn't misstate anything, but I did not read correctly what you wrote. I took that as you are saying that open loop is entered because of long term fuel trim. That is what it looks like you said. What about the rest of my post? ;)...