Pls help diagnose, Rich idle 1.5jzgte aristo

crazy3rdgen

New Member
May 2, 2015
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USA
So I did a good bit to this car, customized the harness etc. I'm trying to build a list of everything that could cause this issue, doesn't matter if its hot or cold, its erratic, 10.1- 14.0 ish. What I know I have, map sensor on the intake manifold, from what I remember there are 2 sensors for coolant on the neck at the front. I have the upstream o2 sensor hooked up. See it wasn't acting like this before I dug into the harness and all so possibly its just a sensor related issue and not mechanical, for instance the regulator or something.

It doesn't have MAF, so what actually is the ECU tuning with? The 1 map sensor on intake mani?