I Might Just Know What I'm Talking About
Join Date: Sep 1999
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No EGR valve on a 94 4.0? Emissions?
Trying to get some help for my buddy with a 94 4.0 YJ. He failed emissions here in MA on the dyno - high NOx. (I did too, but my EGR valve was bad, and I replaced it.) I'm being told that he found out there's no EGR valve on a 94 4.0. Is this true? Anybody know how to lower NOx on a 94 4.0? I understand it is high combustion temp. related, and EGR lowers this.
Thanks all for any help
88 YJ-retiring to trails soon
79 4WD F250-hauler/tower of my toys [img]/wwwthreads_images/icons/smile.gif[/img]
70 Jaguar E-type - the best car England ever made. [img]/wwwthreads_images/icons/cool.gif[/img]
??? pavement-pounder for work/school - opinions wanted.