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Unread 01-19-2014, 08:42 PM   #16
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1992 YJ Wrangler 
Join Date: Jan 2014
Location: Chula Vista, Ca
Posts: 10
Originally Posted by sdmoose429 View Post
Did it fail for Nox? I'm assuming so since it passed a TSI (Two Speed Idle) test. If the head was surfaced, it may have raised the compression ratio just enough to cause high Nox. Also, was the O2 a Bosch?
Yes it was the NOX test I kept failing, as the head being surfaced. I don't know if it had been done before I bought it. When we did the valve job it did not appear to have been surfaced. I cant imagine how much would have to be removed to increase the compression ratio enough to make a difference. The O2 sensor is not a Bosch.

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