It probably is the cat. But, if you like, you can retard the timing and fatten the mixture just a bit and see if that lowers the cylinder pressure enough to get you past. California lowered the permissable level of oxides of nitrogen a couple of years ago and we've sold quite a few catalytic converters in CA since. Here it is: Part number 100419, $224.95 http://www.usadmc.com/dmcstore/ViewPart.asp?PID=110&Qty=1&ShowCart=true Warren at DMC valleyrat12 wrote: > Here are the numbers: > > 15mph NO (PPM) 1147 (1148 max allowed) Squeaked by.. > 25mph NO (PPM) 1283 (978 max allowed) OUCH!! > > All the other nimbers are really low, way below the average. > > Any ideas, is it the cat? > > Nathan > > > > > > > > To address comments privately to the moderating team, please address: > moderators@xxxxxxxxxxx > > For more info on the list, tech articles, cars for sale see www.dmcnews.com > > To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews > Yahoo! Groups Links > > > > > > > > > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/