Leaking upper intake AGAIN - Page 2 - 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, 02:57 PM   #11
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My days are numbered with the upper that I have on the car. I let it warm up this morning
and after about 15 minutes I popped the hood and looked where the puddle is and I could
see a nice stream of coolant flowing down the lower intake from the upper.

I'll have to fix this fairly quickly. I'm concerned what it'* doing inside that I CAN'T see. I
am going to buy a Dorman upper. Enough of this Delphi crap. LOL. I'll post pics of it
once I have it off so everyone can see what 25,000 mile Delphi upper intake looks like!
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Old 02-27-2005, 03:25 PM   #12
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Quote:
Originally Posted by 1993 SLE
but there is an adapter plate so you can use the Series II TB on a Series III UIM
Please do tell... I'd love to have that adapter so I could swap to an alluminum unit..

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Old 02-27-2005, 03:43 PM   #13
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umm...someone has done the swap with a L32 UIM on a L36
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Old 02-27-2005, 04:41 PM   #14
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Quote:
Originally Posted by 1993 SLE
umm...someone has done the swap with a L32 UIM on a L36
Who?

Has anyone had any bad experiences with the Dorman units?
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Old 02-27-2005, 04:56 PM   #15
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check out Club GP for the swap info
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Old 02-27-2005, 06:00 PM   #16
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at least the upper is relatively easy to do. Just the frustration of it all.
Yah I'm interested in the series III swap also.
I used the OEM gasket on the upper and the felpro on the lower.
All I could get on Ebay.

got about 4k miles since it was done. Wonder how long the plastic upper is good for.
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Old 02-27-2005, 06:21 PM   #17
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Did you use the GM cooling system suppliment (sealant tabs)? If you didn't, 4 or those in the radiator should seal it up. If nothing else it will buy you time til it is convenient.
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Old 02-27-2005, 06:39 PM   #18
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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.
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Old 02-27-2005, 06:41 PM   #19
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I did not use the coolant tabs. I'm not a big fan of the "mechanic in a bottle" fixes. The coolant tabs always made me think they fit that category.

I'm going to order a new Dorman upper intake and gasket set. Advance has it for $144. The best part is that it has a lifetime warranty. Since I have to get this done sooner before later I don't really have the time to research and make a SIII upper work on my SII. But in the future I would still like to make the conversion!
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Old 02-27-2005, 08:23 PM   #20
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I tend to agree with the "mechanics in a bottle" theory but the sealant tabs are specified by GM and required per the service manual. They are actually preventative in nature but work quite well.
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