Installed the 1zz throttle body -

[white_rice]

Originally Posted by tk-421

My TB came with a big gunk of epoxy on the idle screw, so I just left it as is. I suspect this is what causes a high idle on the first ~30 secs of starting up, but I'm pretty sure that has nothing to do with your CEL.
Then again, tweaking that screw might just do the trick...

Yeah thats what I'm confused of. Nobody ever seem to have come up with a definite answer as to which one (if either) of these problems was the definite issue causing the CEL. Seems to be more of a hit or miss fix to the problem. Some people appear to have never got the CEL at all. Too many variables here. Suppose I will start with the chip swap and move along from there.