Hello,

I wanted to ask if this UIM/LIM is an issue in supercharged models? I was about to replace valve cover gaskets and oil pan gasket and wondered if I have bigger issues to be worried about.

Thanks,
Jim
97 SSEi

You don't have to worry about the upper intake manifold problem, as your supercharger takes the place of that. The lower intake gasket is an issue however. If you're going to be working on the engine anyway, it would be a good time to "do it all". Get the aluminum framed LIM gasket from the dealer, Intense, GMParts direct, etc., and the Felpro supercharger gasket set. It will include the coolant O-rings that you'll have to pay extra for if you get the GM set, also get a throttle body gasket. Replace the coolant elbow from the LIM to the tensioner. You can get that either at the dealer, or on the Dorman "help" cards at an auto parts store.

Thanks Archon....your reply was a big help. I really appreciate it.

I have been noticing coolant level going down and couldn't account for it'* where abouts. Does it actually make it into the crank case? If so I guess my bearings are shot by now. I suspected it was a very slight head gasket leak and was burning it even though I saw/smelled no evidence of that. My oil has never looked milky? I was in denial I guess.

Jim

I had LIM gaskets replaced last summer when my motor had about 105K on it. The coolant would SLOWLY come out and sit at the bottom of the */C and LIM. Nothing leaked in to the motor, but when everything was pulled apart the gasket was definitely on its way out.

And I replaced my gaskets at 140K mile and had no leaks. It all depends, leaks can happen.

Welcome to the 97 Ei club

I wouldn't sign your engine'* death warrant yet. Without indication that you're pouring coolant into the oil, you may very well has caught things in time. However, as you are losing coolant, it would be wise to change out the gasket ASAP. It'* not a tough job, just lots of detail of getting things out of the way. Head gasket problems are virtually unheard of with these engines.

Thanks to all of you for your replies. It'* reassuring to know there'* such a knowledge base here to draw from. The oil still looks good. No gunk under the filler cap or any sign of water, still clean looking. I did notice some wisps of blow-by though when i took the filler cap off :( Something I failed to mention is that it used/lost a quart of oil since my last 3k mile change which it'* due for now. If any of you guys think of something I should check related to sudden oil consumption, please clue me in. My leaks don't add up to a quart in 3k...I don't even leave any spots on the garage floor....yet. There are some leaks though that I plan to remedy them weekend. I plan to track down Archon'* suggested replacement parts tomorrow to do the intakes while I'm at it. I have replaced the water pump @ 30k....that was a fun job

Using about a quart of oil between changes is not all that unusual. Some engines go through more than others, and are still fine. While you're doing things, may as well change the PCV valve which could add to oil consumption. Make certain that you get the o-ring on it properly.

Archon...thank you very much.

I was unable to locate the FelPro Supercharger Set but I did track down all the parts needed. Pontiac house had all the pieces parts.

Wish me luck!

Jim

I didn't find this info in the Techinfo

Does anyone remember the torque specs for:
LIM
Blower
TB

:?: :?: