Critical L36 Upper Intake Manifold Info....for 2000+ owners - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-07-2006, 02:20 PM   #11
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Quote:
Originally Posted by LittleHoov
Quote:
Originally Posted by CFoote
Dumb question, but does the Shortstar (3.6 V6) have this problem as well?

I have 30k on my Dorman on the '96 SE and so far so good.

Ive done a pretty fair amount of research on the 3.5 and I dont know of any problems with the UIM or LIM gaskets, or any common engine problems at all for that matter.

It does have the same composite UIM though, but the problem with the 3.8 is a design flaw, not because its made of composite material.
Running the EGR through the area of the Composite they did was deffinitely a design flaw... I saw how the L27'* was designed, and wondered what they were thinking when they were developing the L36

Also family member deals with a series of the dealerships local to him and lately they have been seeing more of the 00-02'* come in with upper intake failures... One was an 02 SLE and the guy was a friend of his... iirc the car had 52k on it at the time and popped while going up and onramp

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Old 10-11-2006, 07:28 PM   #12
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Default intake 1997

i have a 1998 regal whit 113,000 km on it the intake is original 1997 stamping i know this car as not been driven hard before but does the fact that in montreal the weather is colder help these intake to last longer i have a dorman intake that i will sleeve just in case don
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Old 10-11-2006, 10:29 PM   #13
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I think there'* some confusion here. Either I'm confused, or we're missing a vital detail.

I don't think anyone ever claimed that the 2000+ models were safe from UIM failure because of a change made to the UIM itself. The remedy for the problem, introduced in 1999, was a different LIM with smaller EGR bore and stovepipe. The LIM difference is what keeps the late model cars safe, not a difference in the UIM.

For this reason, I don't think it matters when EK98'* UIM was manufactured. What matters more is the size of his EGR stovepipe. He could be running a brand new AC Delco UIM, and it wouldn't matter if he had the larger-bore stovepipe. This is likely the case, being that he drives a '98 and most likely has a '98 LIM. If he had a '99+ LIM, it might be cause for concern.

Again, to reiterate, I am under the impression that the date of UIM manufacture has little to do with UIM failure. It has more to do with the vintage of the LIM, because the '99+ models had the smaller EGR bore for more insulating air gap. A '98 LIM will generally compromise any composite intake, regardless of manufacture, due to the larger EGR stovepipe.
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Old 10-11-2006, 10:36 PM   #14
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We've already seen 2000 cars fail the UIM here, and have reports from known mechanics that they're starting to see them too. It may be delayed due to design changes, but it'* still beginning to happen.
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Old 10-11-2006, 10:51 PM   #15
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<raising hand>... victim here... most likely twice over. I replaced the UIM & gasket (and LIM gasket) at 59k miles this past June. The date stamp on the UIM was 2002.... my car was made in June of 2000...
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Old 10-12-2006, 12:11 AM   #16
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Which is why I FIRMLY believe that the Dillon intake produced here, coupled with the Buttermore reduced-diameter stovepipe (produced here also) are the BEST solution to the problem, but only when USED TOGETHER. In addition, either purging the DEXcool for a more mild coolant and/or using the aluminum framed LIM gaskets is the insurance you need on an L36.

How many have seen the sad state of the OEM LIM gaskets? The degradation is a direct result of the poor qualities of DEXcool. The plastic actually erodes.

My recipe for L36 longevity (yes, I've experienced it personally on an L36):

1. Dillon intake. Unless Dorman starts sleeving them, this is the ONLY intake to buy.
2. Buttermore reduced-diameter EGR stovepipe.
3. New AC-Delco ALUMINUM framed LIM gaskets.
4. GET THE DEXCOOL OUT OF THERE!

With these 4 (in my opinion) taken care of, for a grand total of UNDER $200, you will not run any more chance of losing an engine than any L27 or L67 on this Forum.
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Old 10-12-2006, 12:15 AM   #17
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I was just trying to point out that the supposed "safety" of '99+ L36 cars doesn't have anything to do with the build date of the UIM. Those cars were supposedly better because of the revised LIM. Whether they actually are better or not is questionable.

Bill, do you not like the APN intake? It comes pre-sleeved from the factory.
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Old 10-12-2006, 12:35 AM   #18
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Quote:
Originally Posted by big_news_1
Bill, do you not like the APN intake? It comes pre-sleeved from the factory.
Why would I like or prefer that one? The Dillon intake is only $60.
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Old 10-14-2006, 03:32 AM   #19
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My previous question about the APN unit was in regards to this statement:
Quote:
Originally Posted by willwren
Unless Dorman starts sleeving them, this is the ONLY intake to buy.
I was just making sure the APN option was well-known. And yes, I agree that the Dillon unit is much more cost effective. However, if a person wanted a brand new intake for some reason, the APN UIM might be a better choice than the Dorman (at this point in time, anyway).

I was also asking about the APN unit because I thought there may be something about the design that you didn't like.
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Old 10-14-2006, 12:23 PM   #20
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I've never seen an APN. But I have seen a Dillon. Had it in my hands, and installed it. It was a great opportunity to really see the possibilities. I can tell you there'* simply no way it will fail in the EGR port area, particularly if coupled with a buttermore stovepipe.

I firmly believe it'* a permanent solution IF it'* done correctly, and that it can be done for under $200 total (not including labor).
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