coolant issue? UPDATED: now with pics! - 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 03-17-2004, 03:55 PM   #21
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Quote:
Originally Posted by vital49
Quote:
trust me, i know. just suggesting (very strongly) that the upper intake is not the only part of the equation, and so you should never *just* look at the upper intake. also suggesting that if the upper intakes that are being made today are the same as the ones that were being made in '96, then something other than the upper intake was changed - and you'd be better off looking for that instead of changing the characteristics of your upper intake manifold...
We already know that GM went to an improved intake at some point after 2000. Now, looking at the whole picture, we're trying to figure what was exclusive on 99 to not warant a TSB and not have seen many coolant issues.
*sigh*

i know. i'm trying to point you in the right direction. and i'm tryin to say, if the upper intake is failing because of a system, don't assume that the changes made were to the upper intake - look at the whole system.

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Old 03-17-2004, 09:13 PM   #22
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Default intake

Does anyone have a pic of the 2000 or later series II EGR pipe.
Maybe there was a change in that. It seems to me if you re-rout it away
from the exhaust manifold and make slightly bigger fins on it you could
scrub about 15 - 20 deg. off of the hot EGR gases.
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Old 03-17-2004, 10:10 PM   #23
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Default Re: intake

Quote:
Originally Posted by SSEBONNE4EVA
Does anyone have a pic of the 2000 or later series II EGR pipe.
Maybe there was a change in that. It seems to me if you re-rout it away
from the exhaust manifold and make slightly bigger fins on it you could
scrub about 15 - 20 deg. off of the hot EGR gases.
now i think you guys are heading in the right direction...

matt
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Old 03-19-2004, 11:42 AM   #24
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Default Intake

Hey Guys,
I just bought a 2001 plenum off of Ebay cheap.
It too doesn't have any reinforcements in the collant passages but is in excellent
shape. I plan to clean it with fastorange citrus cleaner.
Don't sweat it, GM could have upgraded the composite material to a higher heat
resistant design but nobody knows for sure. Maybe a high tech nut at the dealer would that has been to a seminar.
Even if I put it on and it lasts another 100k I view it as a cheap fix for about
2 hrs labor. Kinda like changing a water pump that lasts 100k.
The only thing it didn't come with is the lower gasket.
Has it been upgraded? or maybe I'll re-use if its in good shape.
Its good maintainence to remove the throttle and clean the back side once in a while
anyway.
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Old 03-19-2004, 12:12 PM   #25
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don't re-use the old gasket. just askin for trouble that way - it costs some 20 bucks from gmpartsdirect and will save you the hassle of re-fixing down the road.

and fwiw, i already knew that the intakes were the same just tryin to spur the thoughts in the right direction

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