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Not possible. Stock 1UZ ECU is not reprogrammable period.

Indeed. Just like, surprise, any other engine. For peak power/torque, fuel economy and emissions. And reliablility. All at once. First thing that can be done here is to completely ignore emissions part, reduce reliablilty margin, and disable everything related to smooth power delivery. Peak...

if you're saying they can be tuned well, you may probably explain why you're thinking so

Can you?

No they aren't

I remapped hundreds of 3UZ locally before offering the service to foreign customers 1UR is the same story The only problem is that they are few So currently I only service my local customers

no time at all, email me and I will try to look at it in a few days

cas=crank angle sensor

not before the Kingdom come

find a local specialist and fix it

apparently you don't have MAF, or you have faulty part, or MAF wiring is fucked up, or mix of listed problems why did you ever poke into CAS while having MAF issue?

sounds like replacement is due, tell us what happens next

What ecu part code was that? Did you buy and send spare ecu to Quantum Auto, or did you buy one there?

welcome here =) https://www.lextreme.com/forums/index.php?threads/oem-3uz-ecu-tune-flash.17541/

Same as Lexus LS400 1998-2000 techinfo.toyota.com lexus-tech.eu

it's been posted whole lot of times and unfortunatelly it never helps. People will still tend to read it wrong or never find this useful information. It's also worth mentioning that this method will not work for old Lexus GS430 (160 chassis code)

I suggest getting official wiring diagram from toyota and tracing all the wires according to it

you're just type of person to fall from 100% support to 100% reject at some point. That's none of my fault