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  #1  
Old 06-30-2016, 07:58 PM
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Cheeseman Cheeseman is offline
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Default How many O2 cylinders ?

Have been taking my '85 4Runner to the same emissions station by Chatfield & Kipling for about 20 years now and have passed with the fast pass every time. Not bad for a 270,000 mile engine. Today I again passed the emissions with a fast pass and pretty good numbers. But I failed the engine inspection. About 15 years or so ago I installed a Downey header that has a bung for an O2 sensor on the rear cylinders only (no. 3&4 cyl.). The manager says the O2 sensor must see all 4 cylinders. So how has this been ok for 20 years and all of a sudden not ok.
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Old 06-30-2016, 11:28 PM
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Honestly, I doubt you'll get around emission laws... If it's in their book and you don't have it, Fail.

Weld in a bung and run a dummy sensor?
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Old 07-01-2016, 07:51 AM
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what is the stock configuration? if its the same then maybe its worth trying to convince them, if not... well then maybe you gotta change things up a bit.
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Old 07-01-2016, 09:00 AM
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my 87 has it at the base of the the manifold where it can see all 4 cylinders
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Old 07-01-2016, 09:17 AM
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They get smarter. The 96 80 passed with a single cat for years but one year they woke up to realize it needed 2. So had to change it up.
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Old 07-01-2016, 03:22 PM
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I got a feeling that whatever the past inspectors passed means nothing. I don't try and cheat the system, just want good guidance. Now I got it. Guess I'll go visit Scotty at AA performance on Broadway and see what he can do.
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Old 07-01-2016, 04:17 PM
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Hello Greg, it should be a simple, not too costly thing, all you need to do is have it moved down stream to where it can see all 4 cylinders.
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Old 07-01-2016, 05:31 PM
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I prefer the common sense emission directives. In your case, I happen to agree with the inspector that it should see all 4. Think of it another way, but in your favor: A check engine light tells YOU that something isn't right and needs to be dealt with before it potentially wrecks your engine. A situation where one injector craps out, or a valve dumps, would quickly trip the CEL...but not if the sensor never sees it! You may very well get another 150k miles out of that engine if it runs perfectly.

In my case, I failed diesel emission twice. When I finally got around to getting it fixed correctly, I'm thrilled with how much better the truck runs! While ticked at emission requirements, in this case, it forced me to find a problem that ultimately made me happier. I just think e tests should be free or $5 and not $50!
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Old 07-01-2016, 06:35 PM
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yeah, shouldn't be too hard, weld new bung in move sensor, plug old spot...
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