Leaking upper intake AGAIN - 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 02-26-2005, 03:50 PM   #1
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Default Leaking upper intake AGAIN

I just changed the oil on my 99 and did an inspection around the engine. I found a small puddle in on of the lower intake manifold valleys. Here'* a pic (I circled the puddle):


And here'* directly above it:


This is on the driver'* side, just down and across from the throttle body. This make me very angry. I just replace the upper intake, upper gasket and all lowers at 77K in May. Now, in Feb., at 103K it'* already leaking. Stupid GM. What a worthless design. God this makes me mad.

My overflow bottle isn't low what-so-ever, but it'* just a matter of time. I guess if I want to keep this car around I'll have to put "new upper intake manifold, new upper intake gasket, and new lower gaskets" on the annual preventative maintenance schedule.
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Old 02-26-2005, 06:40 PM   #2
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Default leak

Vital,
It doesn't look like enough to worry about.
Do you have to add coolant?
You could try re-torquing the bolts or add a small amount of Bars...
No problem.
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Old 02-26-2005, 07:19 PM   #3
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Default Re: leak

Quote:
Originally Posted by SSEBONNE4EVA
Vital,
It doesn't look like enough to worry about.
Do you have to add coolant?
You could try re-torquing the bolts or add a small amount of Bars...
No problem.
well for a 6 year old car I would be kinda pissed off if that happened again.
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Old 02-27-2005, 11:02 AM   #4
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Default Re: leak

Quote:
Originally Posted by SSEBONNE4EVA
Vital,
It doesn't look like enough to worry about.
Do you have to add coolant?
You could try re-torquing the bolts or add a small amount of Bars...
No problem.
Yes, I tried re-torquing it right after the oil change. Thing is that I can't get to all of the
bolts because the fuel rail is in the way. Actually, I can only get to one of the bolts
(near the PCV valve). I'm going to keep a close eye on it. I've been doing 290 miles per
day in it lately so fixing it MUST be done on the weekends...
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Old 02-27-2005, 11:29 AM   #5
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When you cleaned the lowerr intake was the sealing surface marred or pitted in any way?

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Old 02-27-2005, 11:42 AM   #6
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Quote:
Originally Posted by jr's3800
When you cleaned the lowerr intake was the sealing surface marred or pitted in any way?
No, not at all. Looked like new. I'm thinking that I might have gotten a bad Felpro gasket set.

I'll keep an eye on it and tear back into it this spring. It just angers me.
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Old 02-27-2005, 11:46 AM   #7
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Quote:
Originally Posted by vital49
Quote:
Originally Posted by jr's3800
When you cleaned the lowerr intake was the sealing surface marred or pitted in any way?
No, not at all. Looked like new. I'm thinking that I might have gotten a bad Felpro gasket set.

I'll keep an eye on it and tear back into it this spring. It just angers me.
On some of the L36 engines, for whatever the reason, they have actually had to replace the lower intake as well... Yes these uppers are a royal PITA.... I'm afaraid of mine now days... Mine had to be replaced in 99...<---- It still hasn't leaked a drop.. I'm waiting on a crack...

The Alluminum unit is about $100 give or take... But out throttle body will not work on it.. Its not fair... Series III got the alluminum..

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Old 02-27-2005, 11:58 AM   #8
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by vital49
Quote:
Originally Posted by jr's3800
When you cleaned the lowerr intake was the sealing surface marred or pitted in any way?
No, not at all. Looked like new. I'm thinking that I might have gotten a bad Felpro gasket set.

I'll keep an eye on it and tear back into it this spring. It just angers me.
On some of the L36 engines, for whatever the reason, they have actually had to replace the lower intake as well... Yes these uppers are a royal PITA.... I'm afaraid of mine now days... Mine had to be replaced in 99...<---- It still hasn't leaked a drop.. I'm waiting on a crack...

The Alluminum unit is about $100 give or take... But out throttle body will not work on it.. Its not fair... Series III got the alluminum..
Wasn't someone working on a throttle body adapter plate to make the aluminum upper work with our throttle bodies?

What causes the actual lower intake to have to be replaced? Defects in the aluminum?

I'm really interested in making the aluminum upper work, though.
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Old 02-27-2005, 02:09 PM   #9
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I think the bottom intake issues are with pitting or warping... Not 100% on that..

Well the alluminum upper is used on the Series III 3800 V6.. Its all fly by wire for the 3800 series 3... There is no IAC on the series 3 throttle body either... Its all electronicly controled.. The PCM uses the throttle control for idle... So there are no IAC passages either.. lol

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Old 02-27-2005, 02:46 PM   #10
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but there is an adapter plate so you can use the Series II TB on a Series III UIM
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