URGENT: MUST have both airlines hooked up to both cats?? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

camarosource · 02-12-2012, 12:59 PM

Need the answer BEFORE TOMORROW!

Last day I had brand new High-Flow cats (2) hooked up to my car (5.7l v8 350). They only hooked up 1 airtube to one cat because the other airtube was broken off from the car and they claim the second airtube was not needed (trying to pass aircare).

I have read in multiple places that without the second airtube hooked up that I would likely fail aircare (emissions here in BC) because that cat is not burning the excess fuel like it should.

Is this true?

Third-Gen · 02-12-2012, 03:16 PM

For the cats to run at their intended efficiency, they need extra oxygen to burn off the fuel. If Im not mistaken the older cars came with one-way cats, which required the use of aux air to help them run. The newer 3 way cats usually dont need this additional air, but it wouldnt hurt performance to have them both hooked up, and not knowing which cats you have doesnt help. Im not familiar with Canadian emissions, but do they allow you a pretest?

02-12-2012, 12:59 PM	#1
camarosource Drives: 1992 Camaro Z28 Showcar Join Date: Sep 2009 Location: Burnaby Posts: 171	URGENT: MUST have both airlines hooked up to both cats?? Need the answer BEFORE TOMORROW! Last day I had brand new High-Flow cats (2) hooked up to my car (5.7l v8 350). They only hooked up 1 airtube to one cat because the other airtube was broken off from the car and they claim the second airtube was not needed (trying to pass aircare). I have read in multiple places that without the second airtube hooked up that I would likely fail aircare (emissions here in BC) because that cat is not burning the excess fuel like it should. Is this true? __________________ 1992 Camaro Z28. Blue/silver, Custom Blue/Silver Leather seats, Rebuilt Engine, Cammed, Headers, TT ][ Rims ... *NEW WWW.CAMAROSOURCE.CA* *Camarosource.ca FACEBOOK PAGE - EXCLUSIVE INFO On upcoming Camarosource.ca V5.0 and More!!*

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02-12-2012, 03:16 PM	#2
Third-Gen Olson Kustom Works Drives: 91 Camaro, LS3, TVS2300, TR6060 Join Date: Dec 2011 Location: Anaheim, CA Posts: 134	For the cats to run at their intended efficiency, they need extra oxygen to burn off the fuel. If Im not mistaken the older cars came with one-way cats, which required the use of aux air to help them run. The newer 3 way cats usually dont need this additional air, but it wouldnt hurt performance to have them both hooked up, and not knowing which cats you have doesnt help. Im not familiar with Canadian emissions, but do they allow you a pretest?