Series 1 Lower Intake Manifold gasket replacement. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-19-2007, 04:04 AM   #1
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Default Series 1 Lower Intake Manifold gasket replacement.

I just pulled the SuperCharger and replaced the coupler on my dad'* 92 Park Ave. Ultra. While I was doing this I noticed that the lower intake manifold is leaking a little. I decided that I wouldn't replace it at this time because I didn't have the gaskets and and I couldn't find a good description for removing the lower intake manifold on a series 1.

Got the supercharger done and got everything back together, started up fine but then died. Restarted and runs fine until it tries to idle down then it just slows until it dies. I'm thinking that one of the coolant orings between the sc and lower intake manifold might have shifted when putting the SC back on.

So if I have to pull the SC again I think I'll go ahead and do the lower intake manifold gaskets at the same time if can give me some pointers.

I've seen many references to replacing a coolant elbow, but if I've read correctly this doesn't apply to the series 1 engine. Is this correct?

My other question has to do with the bolts on the drivers side of the lower intake directly below the throttle body, they come in from the side of the intake near the coolant temp switch. I can't tell if they need to be removed to remove the lower intake or if they can stay attached while the intake is lifted out. I couldn't find any mention of them in the manual.

Also I assume that the coolant tube under the supercharger has an o-ring where it enters the intake, does this o-ring typically come with the lower intake gasket set?

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Old 02-19-2007, 04:17 AM   #2
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You'll want to replace the coolant hose under the sc coupler while you have it off.

The coolant elbow doesn't apply, You have the hose.

The bolts that come in from the side don't need to be removed.

The o-ring should come with the kit, If not it'* a common size.
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Old 02-19-2007, 09:10 AM   #3
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The idling down and dying issue sounds to me like a vacuum line may be off somewhere. Recheck them.

Same thing happened to me when I did my lower intake on the 94
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Old 02-19-2007, 11:49 AM   #4
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Damemorder'* reply above is only partially correct. You don't have a coolant elbow, but the coolant FITTING in the same location is plastic on your Dad'* car, and is just as prone to failure. Get a metal replacement at the dealer.

Your issue also sounds like a vacuum leak to me. Keep an eye on the coolant levels to be sure. And the oil.
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Old 02-19-2007, 12:39 PM   #5
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Those coolant o-rings can be tricky. When i did mine, I just put a small dab of blue RTV in the recesses, then put the rings on the LIM and let it cure for a few minutes before putting on the */c. I bet on vac. leak too, and I can almost bet where it'* at...there is a small line that goes to the vac. canister on the firewall that is for the climate control. This line, if memory serves, is also tied into the cruise control (though i may be wrong...I don't have the SSEi or the FSM handy to verify).
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Old 02-19-2007, 12:54 PM   #6
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That same line also feeds the climate control. It'* commonly overlooked.

It could also be swapped lines. The two manifolds on your SC are different. One is vacuum at all times, the other is boost/vacuum at different times.
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Old 02-19-2007, 02:45 PM   #7
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So which tree has the check valve? Or is it internally regulated through the */c? I did not know one of the vac trees was boost restricted, and now I'm curious.
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Old 02-19-2007, 03:24 PM   #8
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Check valve? Where?
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Old 02-19-2007, 03:42 PM   #9
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I couldn't find any lines that weren't connected, but I did find a potential vacume leak. The vacume block that sits on top of the super charger (don't know what it'* called) was missing part of its gasket. I'm going to try using some of he gasket maker I had for the super charger and see if this is the problem.

Do any of you know the part number for this part? It'* a small plastic box that is mounted on top of the super charger with one bolt that goes down through its center, and it has 4 or 5 vacume hoses connected to it.

If that doesn't fix it I will probably be pulling the SC and checking the orings, Will I need to replace this gasket (again) if it is covered in coolant.
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Old 02-19-2007, 04:17 PM   #10
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The vacuum block gasket is really hard to find.
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