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.

Terrible Rough Idle, Good MPG = *BLOWN SC gasket*..pics pg 2

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Old 03-08-2007, 06:58 AM
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TaterTot called. It appears that his LIM'* were replaced soon and we speculated that the old SC gasket was reused. It wasn't intact and caused a leak.
Old 03-08-2007, 07:05 AM
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this is why you fix your issues before modding..the gasket is royally fubared.


so replace the injector o-rings, sc gasket..o rings, tb gasket...hmm..LIM gaskets might not hurt...and of course the valve cover gaskets.
Old 03-08-2007, 07:51 AM
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I'd be on the aluminum lowers in a heartbeat. Wouldn't even be a though..it would be automatic. If they fubared the SC gasket..how can you believe anything else?

If you ever think about valve covers..this is the time. It isn't fun doing them any other time.
Old 03-08-2007, 07:55 AM
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Yeah, I'd say that SC gasket could use replacing, lol.

While you're down there, you might as well replace that LIM gasket again, this time with the aluminum-framed one, get rid of the Dex and call that part done.

It sounds like you are doing the right thing and getting it all tuned up and running properly before doing any modding. That'* the only way to go, IMO.

Since you have it off already, how'* the SC look inside?

You going to change the coupler while you're at it? Your post gave me the impression that it'* bad too.
Old 03-08-2007, 08:02 AM
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You are most likely vacuum leaking out of the supercharger. Time to do a nose rebuild.
Old 03-08-2007, 08:04 AM
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Originally Posted by gotbeer
You are most likely vacuum leaking out of the supercharger. Time to do a nose rebuild.
If a supercharger builds positive pressure how do you figure there'* a nosedrive vacuum leak. Oil will leak out the nose first, when that is gone...they you'd get air and bearing chunks.
Old 03-08-2007, 09:42 PM
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....and don't forget to replace the LIM plastic coolant elbows. Cheap insurance while you're at it.

....and since the valve covers are off...cough..rockers...cough
Old 03-08-2007, 09:55 PM
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Paul, let'* not mod a car that isn't running right in many ways. There are issues here, and probably more after that. This car has 170k on it, and needs alot of work.
Old 03-08-2007, 10:03 PM
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Originally Posted by willwren
This car has 170k on it, and needs alot of work.
Cosmetically the car is in perfect shape. I've received 2 PMs asking me if I wanted to sell this one for a bit more than i paid...no I'm keeping it...

It does not need much, I just need to figure out how to adjust the shiftknob assembly.

tonights agenda
Clean up everything
Replace Valve Cover Gaskets
Replace Rubber o-rings on the injectors, the bottom ones.
Clean up everything even more
Replace coolant elbow

INTENSE stuff will be here tomorrow along with all associated gaskets, i ordered gaskets from SHUCKS and the dealer to insure I get them tomorrow in case something goes wrong. The car will be running PERFECTLY by this weekend I hope. Lets only hope for 0* of KR with the 3.4

I'm hoping to have the coupler fixed by tomorrow night and have everything ready for the gaskets I'm getting on saturday.

The 93 is really needing a fuel pump bad right now, it got much worse after a recent 800 mile trip.

I'm ordering a fuel pump once I get my credit card back online...they cancled it for some reason because it was "stolen" or something but I never noticed any charges.

lots of the SC gasket was GONE. scary, I'm glad I caught it early.

the SC looks good for the miles, I'm not going to clean it other than the bypass section and wipe down the inlet.
Old 03-08-2007, 10:41 PM
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Couldn't resist the temptation to recommend further mods.

Yes, I agree that he should take Bill'* advice to get her running well first and concentrate mods on the 93.

You won't find me making those recommendations though. I mod all my cars.....and keep them all reliable daily (when the sun is shining and the roads are dry ) drivers.

OK, I lie a little. The Jeep only has K&N cone CAI intake and Borla exhaust. I have never even changed a valve cover gasket. 170 K and running strong in all weather.
......and it is the only one that still has an EGR.

Hans - don't expect to run faster than mid-high 14'* with a 3.4"


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