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I read this as saying the next day it ran perfectly. And cars don't fix themselves. But the symptom is easily explainable. Feel free to send me the bad ECU.

As I said, OEM mufflers=quiet.

I wasn't thinking he had any misfire. Just excessive HC's from an external source, or the cats not operating. Yeah, his oxygen sensor may not work right, it could be lazy. And it will affect your A/F's. I know you said you just got it, but you never know.

Are you sure you need an ECU? Other than coincidental occurences, what is your reason? Without changing anything, your car mysteriously fixed istelf in the thread at one point. I was going to say what Jetjock said. That is what happens with fuel cut.

::hang:: ::hang:: Those do look good though. But if another set of sawblades ends up in trash heap, I will string up my own rope.

You need to read about rules of racing before commenting on why a Mustang uses a particular setup. I'm not trying to piss you off. Variable cam timing is a holy grail of tuning. Ever see a big lopey cam in a car, and how shitty it idles? What if you could change that duration at idle? I don't...

Malloynx passed 600 flywheel hp with bolt on power. I think if he redoes the head, he can simply hit that point easier.

The OEM Cressida quiet mufflers will shut it up.

Thermostat temperature ratings are minimum(opening) temps, not operating temps. Keep that in mind. You don't want a real cold engine. Mileage will suffer. Post pics of the setup when you are done. :)

Non chow dogs can have a spotted tongue too. Probably because there is no such thing as 100% "pure bred". Defying Adolph's hopes He looks like he has a hard life. :biglaugh:

SOEM=SOME

You need to have the 3 main components of the combustion triangle. Air/fuel ratio, spark timing, and compression. You get compression from the mechanical portion of the engine. Do you know if yours is good? And the engine must be timed right, or you will not have compression. Spark timing...

Rear end shot, cause everybody likes that. ;)

Are the valve covers still dry? Random cats have been pretty good from what I have read. Many other "high flow cats" aren't so hot. So no Lex/550 or other A/F altering mods at all?

Since the NOx and CO2 aren't too far off, you have decent combustion. I am guessing it drives normal? But yeah, your CO is high, despite what the comment section indicates. Your NOx being a little low also shows a richer mixture. That leaves the question of why. Off road down pipe? If so...

Stock Toyota thermostat opens at 190, and so should you. Why not measure the temp in the same spot Toyota does? Here is your flow chart. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=CO&Page=2

Why do you think it is rich? There is an emission trace for it, and HC isn't it. Post the whole trace if you can.

Like a different but similar thread... Now waiting for the "why doesn't my car start good when it is hot" thread.

Time to change your sig.

I know of one other that put a hole in the piston without losing the gasket' He was running a composite OEM style. Good to see you planned ahead though.