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Old 04-02-2010, 02:32 PM   #1
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Default 91-92 3800 Aluminum UIM

So, I had a 91 buick regal UIM that I figured I would put on my bonneville while trying to fix the intake manifold leak and all the other problems that came with the "new" motor.

Anyways, unfortunately, it doesnt have the EGR, and I am a little confused about the vacuum. For the EGR, I am just going to drill the UIM and add a pipe and bung to attach an EGR tube. Vacuum..... I'm at a loss. I assume that there is some type of vacuum block that attaches to the square hole in the top.... Anyone verify that for me, or is that hole for something else. I just need to know whether I need to fabricate something, or if I can pick one up somewhere. If I can pick one up, any ideas where?

I coulda taken a picture of mine, but it is so much easier to just post a link to an e-bay auction that has the same thing. This is the style intake manifold I have: http://cgi.ebay.com/ebaymotors/91-92...Q5fAccessories
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Old 04-02-2010, 10:09 PM   #2
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Yes there is a vacuum block for that manifold. You have facing the firewall, vacuum for: fuel pressure reg, brake booster & vacuum reserve tank. Toward the front you have emmision canister & AT vacuum modulator.
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Old 04-03-2010, 01:18 AM   #3
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Any idea where I can get one, or am I better off with salvage yard or getting a chunk of aluminum and making one?
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Old 04-03-2010, 01:43 AM   #4
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You know, you could also have plugged up the LIM throttle body passage holes with pipe plugs.
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Old 04-03-2010, 07:12 PM   #5
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Yes I do know, but that wasnt the only place it was leaking, and I am trying to keep the fuel economy as high as possible in this car, therefore hotter air on the intake can mean higher fuel economy. A little reprogramming and I should be well over 30mpg. Plus, this aluminum intake will last forever. If I cannot find the parts I need, I still have the plastic intake and the option of plugging the coolant passages, but then I will still need to replace the gasket and hope it seals.

For the aluminum manifold, I am just going to cut out that piece across the center, weld a piece of aluminum to cover it, and drill and tap it 1/2" pipe thread so I can just make a new vacuum tree.
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