1992 SSEi Lower Intake Manifold Replacement - Options? - 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 11-08-2013, 06:49 PM   #1
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Default 1992 SSEi Lower Intake Manifold Replacement - Options?

I came across this information in a previous thread. But here is my situation. I have a 1992 Pontiac Bonneville SSEi. I am the original owner. I had a LIM leak (between the LIM & Heads). When working on it today, I discovered a previous repair (likely by a dealer) when they put in a replacement thermostat a long time ago - had lots of sealant around everything. When taking it apart, there was a lot of corrosion in that thermostat seat, and pitting all over. I can see why someone tried to make it work now. There was also a problem many years ago getting that heater pipe that goes into the front of the LIM (pipe has an o-ring and is held in by a bracket), and that also had a lot of sealant from a previous repair.

Anyway, there is enough corrosion there that I don't want to put this LIM back in. Of course, there is no dealer option to put a new one in. I went out to the salvage yard and found 2 possible LIM'*, but both were from 1995 vehicles (one an SSEi, the other a Buick Riviara) The one in the 1995 Riviara has a black coating on it, while the one on the 1995 SSEi is silver, just like my 1992 is. I know the 1995 SC'd vehicles had a somewhat different Eaton blower on them, but the LIM looked a lot alike. I don't want to go to the trouble to remove one of them to find out it won't work. Any inputs if a 1995 LIM will work in a 1992 application?

My LIM GM part no. is 24501562. I don't know what the 1995 LIM'* GM part no'* are, but I think they are 24502302, from what I could barely make out with them installed. I don't want or need the 1995 SC'*, as I know they won't work properly in my 1992. Just want to know if the LIM from a 1995 is identical to my 1992 LIM.
Interesting find here. I have four lower intake manifolds here:

1992 SSEi, salvaged by BillBoost and Pat
1993 SSEi, stock LIM on the Zilla, heavily modified :P
1995 SLE, stock LIM on the SLEeper
1995 ???, salvaged by LakevilleSSEi

The 92 looks just like my 93. The 95 Nate sent me has a crack running down the 'hump' on the inside of the LIM. This is very likely why the LIM was horrible inside. Coolant leak. Probably also why the ignorant former owner removed one of the ECT sensors and installed a plug. They never knew they were overheating.

Aside from that, there are some REMARKABLE differences between the 92/93 and the 95. However, all the older part numbers have been obsoleted, so it wasn't a MODEL change, but rather a part improvement that obsoleted previous units.

LIMs are marked as such:
1992 SSEi, 24501562
1993 SSEi, 24502104
1995 SLE, 24502302
1995 ???, 24502302

24502302 is the only valid current part number.
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Old 11-08-2013, 08:42 PM   #2
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I'll narrow your search down further. 1995 is the year the Series 2 N/A came out and ended production in 2005. Nothing will cross over from a S1 and S2. 1996 is the year the Series 2 */C came out. It'* based on the Series 2 N/A block and heads. Using different internals is really the only difference.

You cannot use a */C intake manifold in an N/A environment. And vice versa.

As far as the Series 1 manifold goes. I would think anything 92-94 would work, but try to find something 94. That would be the last year of production.

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Old 11-08-2013, 10:12 PM   #3
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Originally Posted by Mike1995 View Post
I'll narrow your search down further. 1995 is the year the Series 2 N/A came out and ended production in 2005. Nothing will cross over from a S1 and S2. 1996 is the year the Series 2 */C came out. It'* based on the Series 2 N/A block and heads. Using different internals is really the only difference.

You cannot use a */C intake manifold in an N/A environment. And vice versa.

As far as the Series 1 manifold goes. I would think anything 92-94 would work, but try to find something 94. That would be the last year of production.

Buick V6 engine - Wikipedia, the free encyclopedia
This response got me confused. My 1992 SSEi is a Series 1 SC engine. The 1995 Buick & SEEi vehicles I found in the salvage yard today are also Series 1 SC engines. Why won't a 1995 Series 1 SC engine'* lower intake manifold work on a 1992 Series 1 SC engine? On the surface, they look idential. And for SC engines, the Series II did not come out until the 1996 model year.

Please help me understand. At first I thought your response would say they would work. But later, you said 1992-1994, but not 1995. A 1995 Series I SC engine'* LIM will not work on a 1996 Series II SC engine, as I saw significant differenes between these 2 engines. If a 1995 Series I SC engine'* LIM won't work on a 1996 Series II SC engine, it won't work on a 1994 Series I engine either? Was 1995 a stand-alone year as far as LIM'* go?
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Old 11-08-2013, 10:15 PM   #4
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PS: To make sure we are talking all the same: I have an SC engine, and the LIM'* I am looking for are from SC engines. I'm really heavily leaning that 1992-1995 SC engines, all being Series I, have the exact same LIM, no matter what the part number says.
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Old 11-09-2013, 05:39 AM   #5
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My bad, I forgot to add, the Series 1 L67 was used until 1995.

So, yes, the engines and heads are the same 92-95 which means the LIM should be the same throughout all the years, even if they do have a different part#.
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Old 11-09-2013, 08:39 AM   #6
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My bad, I forgot to add, the Series 1 L67 was used until 1995.

So, yes, the engines and heads are the same 92-95 which means the LIM should be the same throughout all the years, even if they do have a different part#.
Great. My biggest concern was if the mounting holes for the 1992 Series I SC engine lower intake manifold with the Eaton M62 Series II supercharger and the same mounting holes for the supercharger as the 1995 Series I SC engine lower intake manifold with the Eatom M62 Series III supercharger. I was hoping the difference in the superchargers did not affect physical mounting of them to an intake manifold. The Eaton SC base looks identical, so I think they would be interchangeable from a mounting perspective.

Now, if one of those Eaton M62 Series III SC'* were in great shape with the larger diameter throttle body, it would be great to put one of them onto the 1992 SSEi, but if I follow the threads here, my ECU wouldn't work well with this later generation Eaton M62, right? My SC is in great shape, but if the only thing one had to do was put an Easton M62 Series III SC onto my 1992 SSEi (with the larger throttle body, intake tube & filter box, all of which look like they are simple swap-outs) and I would get an extra boost in HP & torque, that would be great. But it'* not that simple, right?
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Old 11-09-2013, 10:37 AM   #7
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The current injectors and programming can only allow for so much more added boost before upgrades become necessary. In theory you could run more boost, but IMO, I wouldnt try and squeeze any more power out of that Series1. Upgrades are almost none to find.
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Old 11-09-2013, 10:47 PM   #8
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Quote:
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The current injectors and programming can only allow for so much more added boost before upgrades become necessary. In theory you could run more boost, but IMO, I wouldnt try and squeeze any more power out of that Series1. Upgrades are almost none to find.
Yes, but...the 1994-1995 SC engines were also Series I, and with the Eaton M62 Series III SC, they gained an extra 20 HP (from 205 HP to 225 HP). Likely all of that gain was not due only to the series change in the Eaton SC. I'm sure the reprogramming and higher volume injectors played a role. But there was 20 HP additional left in that Series I 3800 V6.

I got the replacement LIM from that 1995 SSEi in the salvage yard. It was much better from a corrosion standpoint than the one I had, but far from perfect. The Riviera LIM was no better than mine. On the way out, I saw a second 1995 Riviera with the SC engine. I was getting cold and didn't want to check that option any further. The first 1995 Riviera that I found had an Easton M62 Series III SC that was in great shape - no lash in the coupler, turned very well. Just wish there was a way I could consider using it, but I decided to leave it there. Hopefully someone else will get some value from it.
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Old 11-10-2013, 10:56 PM   #9
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Update: Installed the salvage LIM today. Took time to take care of a bunch of small items as well (vacuum tube rubber connections that were cracking apart, heater hoses that were swelling from being exposed to supercharger oil from a long time ago, valve cover gasket replacements, power steering & power brake fluid flushes, coolant flush, etc.). Got it running this evening. Will still need to do an oil change and transmission fluid change (all with filters), and check for leaks, but so far, it appears everything sealed up well and nothing leaking. That 1995 LIM for SC engines fit well in my 1992 SSEi. Later this week, new front seat leather covers. Will be a new car before too long. Its really in great shape now - someday hope to get it into a few collector car shows. 1992 was a pretty neat year for the Bonneville SSEi.
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Old 11-11-2013, 08:46 AM   #10
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Outstanding!!

Might want to make that engine oil change a priority. Anytime the LIM is removed, coolant always seems to make its way into the engine oil. And those 2 don't mix well.
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