Hi all
1993 JDM with 1fz
I just built from scratch new exhaust from head back. New high flow catalytic converter installed.
I only put back the front O2 sensors. The O2 bungs that I built does keep the sensor a little higher up then before, so they are not in direct contact with flow. But looking at the original, they were already a little high to begin with. But, I was thinking the rear were only for emissions purposes. So I did not put them back...
But now I have low, maybe a bit rough, idle. Cold start does not rev up like it did. Just sits at 5-600ish rpm.
Runs fine when I get going, feels normal driving. Just, low rpm idle. Is there a "learning" process for the ECU? I am not sure if the ECU is that complicated...
Are the rear O2 absolutely required? Was I wrong to assume they were emissions only?
1993 JDM with 1fz
I just built from scratch new exhaust from head back. New high flow catalytic converter installed.
I only put back the front O2 sensors. The O2 bungs that I built does keep the sensor a little higher up then before, so they are not in direct contact with flow. But looking at the original, they were already a little high to begin with. But, I was thinking the rear were only for emissions purposes. So I did not put them back...
But now I have low, maybe a bit rough, idle. Cold start does not rev up like it did. Just sits at 5-600ish rpm.
Runs fine when I get going, feels normal driving. Just, low rpm idle. Is there a "learning" process for the ECU? I am not sure if the ECU is that complicated...
Are the rear O2 absolutely required? Was I wrong to assume they were emissions only?