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Old 05-07-2009, 08:39 AM
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Crash Crash is offline
Rising Sun Member
Join Date: Aug 2005
Location: Denver
Posts: 2,646

High NOx was the failure point of my '88 Cruiser with the other catagories well within limits. Replaced the O2 sensors and the cat but I'm pretty sure the old sensors were fine - I replaced them as preventive maintenance. NOx numbers dropped to within limits without any other changes besides the new cat and sensors. Timing was set at stock 7*BTDC.
Good luck!
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