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Old 06-01-2018, 02:22 PM   #411 (permalink)
Cyborg ECU
 
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,668

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.77 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by Chrysler kid View Post
...
Considering you would want to superheat your exhaust to run leaner, you can safely assume at your mileage that since you are not suffering from loss of power, that the catalytic converter material has broken internally. ...
I don't know. The code is intermittent. I get it. I clear it. A few days or a week later it maybe comes back. I think it has been a week now and couple hundred miles without it lighting up. If the CAT were as damaged as you are suggesting, wouldn't the failure be more complete? I think maybe my head gasket failure bummed up the CAT. Maybe it is clearing itself over time? Ever seen that happen?

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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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Old 06-03-2018, 01:45 AM   #412 (permalink)
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IGL - '04 Saturn Ion
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My Saturn had an O2 related code that would come up from time to time (something about response time or something), that’s been completely gone for the last 20k mi... it also recently had a P0420 that I haven’t seen in a while...
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Old 06-03-2018, 10:08 AM   #413 (permalink)
Ol' Skooler
 
Join Date: Jul 2009
Location: Tyler, TX
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Beater Echo - '00 Toyota Echo
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90 day: 42.67 mpg (US)

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Cat codes can drive you nuts. I went a bunch of years in my Echo with a bad cat. If I cleared the code during summer on the freeway, it might not come back until I got off the freeway. But if I cleared it at any time during winter, it would come back immediately. If it's a P0420 the cat probably is bad; if it's an O2 code, it deserves more testing (doesn't take long).
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Old 06-06-2018, 08:17 PM   #414 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,668

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.77 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,620
Thanked 1,314 Times in 889 Posts
Clear tint light transmission retest

Moving very slowly because of work and family duties, but I stole some daylight time just now to rerun some light transmissivity tests on the clear tint I am experimenting with.

I figured out the mistake I made in post #405 above. I moved the light sensor. Any change in angle to the sun changes the reading. So I did the test again.

Using my tablet's built in light meter and an app to read it on screen, I find a 28% reduction in visible light through the clear tint versus the bare windshield. Seventy two percent transmission is acceptable. My side window tint allows only 38% light transmission into the car.

Of course, heat transmission is a different bear. I have no tool for measuring that.

On another note, I creased part of the tint during the test. Good thing I bought more than twice what I need. I knew I would eff up some.

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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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