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Weird st205 AFR's while cruising

Mon Nov 13, 2017 2:49 pm

Does this look normal for a st205 engine/ecu set up?
I have no CEL and the o2 sensor was replaced by the PO but he ran the st205 swap with the oem 540 injectors with a st185 ecu so he ran it rich at low rpms :doh:
Luckily he said most of his miles were Hwy. He said......
A long time ago when I had the gen3 electronics (mr2 ecu) on my gen2 engine the afr's were solid while cruising at the normal 14.7ish afr's
https://youtu.be/2uanaHEUztw
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