2.5 vs 5.2 smog specs? - JeepForum.com
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post #1 of 1 Old 06-22-2010, 01:36 AM Thread Starter
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1992 YJ Wrangler 
Join Date: Jul 2006
Location: Woodland
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2.5 vs 5.2 smog specs?

I'm going back and forth on whether to swap in a 4.0 or a 5.2.
I'll be using the EFI for either one, because I've got to get it to pass the smog sniffer.
I know a 4.0 swap is a safe bet because it was an option for the chassis, and is legal and pretty easy.
I'm not up on the smog output requirements, but was wondering if a well running EFI 5.2 will emit "more" smog readings than my EFI 2.5?
If I can get a 5.2 to pass the sniff test here in WA state, that might be what I need to do.

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