This is topic smog in forum Tech Talk at Northern California Ford Owners  .


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Posted by mysnakebyts (Member # 4099) on :
 
car failed smog test good on everthing but nox 1000 at 15 and 25 is it cause of bassani x pipe? 96 cobra anyone have problems passing with x pipe with 2 cats should I put 4 cats?
 

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Posted by JoeT (Member # 298) on :
 
not a smog tech but NOx too high is often

EGR
too much timing
cats


check EGR operation 1st
 

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