failed emissions
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From: Clinton, MA
<font face="Verdana, Arial" size="2">Originally posted by '88Saleen:
I thought that LT's are not an emmisions legal header.So it does'nt really surprise me. I read in MM&FF a while back that with long tube headers you have to put the Oxygen sensor futher back and it picks up slightly cooler readings because its father away and it sets the CPU in cold start up mode which runs slightly richer and thus probaly won't pass the sniffer test.
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I thought that LT's are not an emmisions legal header.So it does'nt really surprise me. I read in MM&FF a while back that with long tube headers you have to put the Oxygen sensor futher back and it picks up slightly cooler readings because its father away and it sets the CPU in cold start up mode which runs slightly richer and thus probaly won't pass the sniffer test.
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Technically you are right in that any header that changes the position (or number) of cats is not emissions legal. However, I have the ability to log data from and reprogram my car's pcm, so I know the O2's are reading fine. The car goes into closed loop no problem. AFAIK federal law allows you to replace the cats after 50K miles, as long as they are in the stock location(s).
Joe
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