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Old 12-07-2017, 05:08 PM   #7 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,090

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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I kinda understand the lean burn system in the Honda but not completely thoroughly. Still, I'm pretty sure HC is not the primary side effect of lean burn. NO would be the high level from lean burn it seems to me. So I'm not sure changing the ECU, oxygen sensor, and harness to convert the car would be such a good idea since the problem might be elsewhere. Also, when the technician plugs into your OBD port he's gonna be looking for the proper ECU in the car. He'll be identifying it electronically. I'm not certain, but you might fail just for having swapped out the ECU.

A thought that I have is that perhaps the CAT is really old. There is a process for cleaning the catalyst using a combination of citric and oxalic acid. It seems to work from what I have seen people do online with it. And the process was scientifically proven to work in a lab. I did it with my own catalyst but my procedure for the testing of its effectiveness got botched. So I can't personally vouch for whether it works or not. But I have no codes showing. The CAT on my civic is 18 years old. Try cleaning it?
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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