90' YJ 4.2L Upstream and Downstream Air Tubes - Jeep Wrangler Forum

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Old 03-16-2008, 07:42 PM   #1
Join Date: Mar 2008
Posts: 3
90' YJ 4.2L Upstream and Downstream Air Tubes

Need your help guys. I am new here! You guys seem to help everyone, hope you can help me.

Finishing a clutch job, had the trans out and putting new exhaust up. Problem is with the location of the (2) air tubes, Downstream tube connects to the exhaust pipe and Upstream tube connects to cat or viceversa. Anyway. Where does the bracket that hold the two tubes mount to. It appears that it mounts in one bolt for the starter. More important ? which tube is nearest to the firewall the taller tube?

Anyone have any photos?


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Old 03-16-2008, 09:39 PM   #2
Join Date: Oct 2007
Location: san antonio tx
Posts: 10

if you can go to this link and open group 25 emissions there is a break down
hope this helps

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Old 03-17-2008, 09:17 PM   #3
Join Date: Mar 2008
Posts: 3

Wow! That is an awesome pdf file. Lots of info. Thanks for the help.
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