plastic intakes?? - 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 12-20-2004, 03:04 PM   #1
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Default plastic intakes??

I have a 1999 lumina with a 3800 series II in it, does this engine have the plastic intake, i havn't had a chance to look at it much just put a deposit on it and have to pick it up in a week or so, just wondering.
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Old 12-20-2004, 03:32 PM   #2
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Yes, it'* the same engine as used in the Bonnevilles, the L36. And yes, they are subject to the same Upper Intake failures AND Lower Intake gasket failures!

What failed on your Lumina? The Upper Intake or the Lower Gaskets? Many of us 99 owners have witnessed the actually Upper Intakes not failing, but the Lower Intakes just degrading very severly.

And when you do (or have) the gaskets and/or Upper Intake replaced, get that 90* by-pass elbow replaced between the Lower Intake and Belt Tensioner. It'* good $7 insurance for something that will most likely fail in the future!
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Old 12-20-2004, 03:43 PM   #3
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if you want you could put a Series III UIM and get a TB adapter
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Old 12-20-2004, 08:53 PM   #4
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Default plastic intake

Yes I hear the new series III metal intake could be adapted to the II but hav'nt
confirmed this yet.
Could someone else substantiate this?
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Old 12-20-2004, 09:00 PM   #5
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yes there are guys on club GP that have done it
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Old 12-21-2004, 08:30 AM   #6
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Quote:
Originally Posted by 1993 SLE
yes there are guys on club GP that have done it
Is there a procedure here anywhere on how to do it?
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Old 12-21-2004, 10:00 AM   #7
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Quote:
Originally Posted by vital49
Is there a procedure here anywhere on how to do it?
It'* just the same as swapping out the plastic one. Only difference would be is adding the plate for the TB.
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Old 12-21-2004, 11:17 AM   #8
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Quote:
Originally Posted by smellbird
Quote:
Originally Posted by vital49
Is there a procedure here anywhere on how to do it?
It'* just the same as swapping out the plastic one. Only difference would be is adding the plate for the TB.
Isn't that plate an aftermarket adapter? Or is it GM?
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Old 12-21-2004, 06:16 PM   #9
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well the my bonneville just died suddenly, oil pump, i think there is more to it than that, i've been told the 3800 engines are a good strong mill. anyhow i bought a 99 lumina cop car with a 3800 series ii in it, it has around 280,000 klm, but runs like new, i started it up on a cold day at the dealer, it was a trade in, and it was a cold day, in the -2 or so, and it was quiet as a mouse, and let it warm up, rev it, no smoke out the exuasht or carbon, it hass dual exausts on it, wierd, anyhow i just have herd stories and problems with the intake, and wanted to know if i was going to be in for a surprise, i know it'* not a bonnie, but it'* running the same mill as alot of you guys with the NA engine. Man i am gunna miss my bonnie big time, the difference in cars is just stupid, but i have kids, i live in canada, and it'* cold!! plus i can't rely on my buddy to keep picking me up at 6 am everymorning forever, so i will be picking it up on the 27-28 of dec. it has abs light on and engine light though, but it is obd ii so i guess i have to get it scanned by a shop right? or some scan tool that is obd ii compliant.??
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Old 12-21-2004, 09:37 PM   #10
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You can actually have your car scanned for free by AutoZone. The OBD II testers are common. Also, check out the tech info for someone who may live near you with an OBD II scanner.
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