Leaking upper intake AGAIN - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-27-2005, 09:32 PM   #21
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Quote:
Originally Posted by ron350
Hate to sound like a broken record but why not plug the two coolant holes in the lower intake and be done with it.

All you need is:

2 - 1/8 aluminum pipe plugs. Earls # 3202

1 1/8 pipe tap

JB Weld or your favorite high temp sealer.
Not sure what you're talking about..
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Old 02-28-2005, 02:02 AM   #22
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There are two machined holes in the lower aluminum intake manifold for the coolant that goes up through the plastic intake to the Throttle Body. These holes are on ether side of the EGR pipe sticking up on the throttle body end of the manifold. If you take the plastic manifold off and tap and plug these two holes there will no longer be any coolant to leak. Once these holes are plugged the only leak you can have with the plastic intake is a vacuum leak.
If your car is idling fine now you can do this and reuse the upper gasket and upper manifold.
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Old 02-28-2005, 03:17 AM   #23
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Ron: Would that include coolant leaks at the throttle body? I have a '99 SLE I bought new, and now has 104K miles on it. The car has been reliable as an anvil, but it has a small leak around the throttle body when the engine is warm.

I find myself adding coolant about every 6-700 miles now and it'* beginning to bug. Since I have to do the job anyway, would it be worth it to pull the top manifold off and do as you suggest, or is perhaps just replacing the thoittle body gasket a better idea?

No choclate milk in the crankcase, by the way.

By the way, I'm a newbie here and this is a great forum! This is the first Pontiac I've owned later than a 1972 model and despite being a car guy of some 40 years, there'* stuff under that hood that I don't recognize!
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Old 02-28-2005, 12:46 PM   #24
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is coolant leaking down the TB and then on to the trans? if so they your TB gasket is bad, and it is an easy fix
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Old 02-28-2005, 12:50 PM   #25
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1993 SLE: Yes, it is, but after reading all the horror stories here, maybe it'* time to fix the upper intake problem all at once before I hydrolock the engine?

I sure like Ron'* idea of dry-decking the upper manifold if that'* the case.
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Old 02-28-2005, 01:10 PM   #26
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yes you have a 99 right, most , and i say most, not all problems were fixed in 99. but if you want to relapce the UIM, they you should do the LIM gaskets as well
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Old 02-28-2005, 02:31 PM   #27
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Quote:
Originally Posted by 1993 SLE
yes you have a 99 right, most , and i say most, not all problems were fixed in 99. but if you want to relapce the UIM, they you should do the LIM gaskets as well
I've already done all that. It'* not the lower gaskets. I did them at 77K....along with a new upper intake. The upper intake is clearly leaking and not the throttle body. Directly under the throttle body is bone dry. I can actually see the upper intake leaking at the corner down onto the lower intake.

I'm going to buy a Dorman upper along with a new upper gasket set.
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Old 02-28-2005, 02:39 PM   #28
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Vital... As I'm looking at the pick to the left of the EGR and to the right of what appears to be a little dex cool, almost dead center between the two... Is that a casting flaw in the lower intake manifold or a crack?


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Old 02-28-2005, 09:05 PM   #29
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Hey Don... Can you circle on my pic where you're specifically talking of? I may very well have a flaw, but not know it. What should it look like?
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Old 02-28-2005, 10:27 PM   #30
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"....almost dead center between the two... Is that a casting flaw in the lower intake manifold or a crack? "

Looks like a crack to me.
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