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hey hey been awhile guys but im stumped, i did a GTX Swap on my 93 Gt, but inorder to pass smog here in california i had to revert back to the stock set up so what i did is left the GTX block and switched intakes and exhaust manifolds, runs great Super clean as far as HC and CO but nox is WAY high
ive retarded the timing as far as i can go and got colder plugs, what other things could i do to drop Nox? any help would be great thanks

Trusty
 

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If I'm not mistaken, I think nox is due to too lean of a condition. Do you have tune-ability as far as air/fuel ratio? If not, you could try and re-tune the VAF. Check for vacuum leaks?
 

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what fpr are you using? the stock gt fpr uses a higher pressure than the gtx one iirc. that would make you run a little lean going back to n/a.
 
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