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Old 07-03-2013, 05:13 PM   #1
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Join Date: Apr 2013
Location: Phoenix, AZ
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90 YJ 4.2 Exhaust

I have a few problems with my exhaust that I would like some advice on.

First it seems like the flange on the downpipe is not sitting properly. I have a brand new cast iron exhaust manifold and the bolts will not stay in. I have to tighten them every other day and it's getting really annoying. I replaced the bolts but no go :/


Also the engine has a weber (i think it's a 38 dges) carb and has been nuttered. The 2 exhaust loops that feed back into the carter air cleaner are both just sitting open in the engine compartment. Is it safe to cap and weld those 2 pipes? One goes to the downpipe and the other goes to the cat. This is a street driver for me too so I need it to pass Phoenix, AZ emissions.

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1990 YJ 4.2L
Currently in the shop for an 8.8 swap!
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Old 07-03-2013, 05:25 PM   #2
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Manifold - should have studs in the manifold and nuts to secure the down pipe. I used red locktite and they haven't worked loose at all.

Pulse Air pipes - can be pinched and welded if the excess vacuum was removed when the nutter was done. Assuming of course the vacuum isn't required for emissions regulations in your state. Not sure what AZ law is regarding that.

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Old 07-03-2013, 05:27 PM   #3
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I don't think they care about vacuum as long as the levels in the exhaust are good.
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1990 YJ 4.2L
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Old 07-04-2013, 12:03 AM   #4
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I found that the bolts were too long because I was not using the belleville washers because they are now MIA. After closer inspection the flange was not 100% in contact with the manifold. Thanks Mbclark. I will find suitable replacement washers and use locktite red.

I am going to follow the lines up and see where the vacuum goes off to. Almost all of the vacuum lines are disconnected.
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