Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

emissions problems 94 Z28

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Old Sep 18, 2004 | 07:17 PM
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dsheola's Avatar
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emissions problems 94 Z28

we have a 94 Z28 w/ LT1 and 6 spd. can't get the NOX lower than 1150 vs a required 875 (NJ). the car has some mods (chip, headers, TBI). we installed a new cat (since the previous owner hollowed it out) and still can't get it down.

HELP
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