I have an update for anybody interested. IAC bearing was seized, so I replaced them, but it still had the same behavior, idles faster when warmer.
I though the IAC was working previous to this post, but it was not. Now I definitely knew the IAC was working, so I figured it (IAC) must be out of...
I tried to reverse the ISC1 - ISC4 Pins in the ECU thinking they had been wired wrong in the transplant, but it didn't make a difference, so I put it back the way it was originally
Check the old sensor and replace it with a new one - Check it was with in spec before putting it in.
Ran the engine up to temp so I would have thought all the air was out of the system + plus it does the same behavior every time, idle come up as the temp increases runs about 95deg when...
I believe so, Black-Orange wire from ECU E11-4 to Pin 86 on EFI Main Relay and I can hear a relay click several seconds after I turn off the ignition. When starting the engine has a very short period of fast idle and then comes back to a very low RPM, then as the engine warms up the idle goes up...
Update
I ran continuity tests between plug and ecu wires - all appear to be wired in correctly. So I reversed the order anyway at the ECU to see if it would make a difference. It made no difference to the cold idle. Didn't wait to see if it fast idle at operating temp.
I put the wiring back to...
Hi All,
I have a 1UZ in a WB ute.
When cold it has a very low idle (600rpm) and hunts a little bit.
When warm it idles very fast (1200) and occasionally seems to have a small miss/studder.
Temp sensor OK.
No engine codes in diagnostics.
So I am wondering if it possible for it to have wired...