Air passages in LIM - 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 11-22-2007, 03:47 PM   #1
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Default Air passages in LIM

I changed the LIM gasket a week ago. Everithing went fine and my coolant leak appears to be gone.
I noticed something when I had the LIM removed. The air passages in the LIM (and UIM) were black for cylinders 6 and 5 and they were gradually lighter towards the front of the engine. Cylinders 4 and 3 had the air passages brown to light brown and cylinders 2 and 1 had a light yellow to aluminum silver color.
It appears that cylinders to the rear of the engine are running hotter than cylinders at the front of the engine.
Is this normal?
I don't know if it is related but my car has been blowing the NOx limits for the past 3 years (running too hot?).
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Old 11-23-2007, 10:19 AM   #2
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Anybody? No ideas?
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Old 11-23-2007, 10:56 AM   #3
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If you look at the intake it will usually be the #1 & 2 runners that are the cleanest... The rest will be bit darker...

In other words... Yes this is normal...

Are you at this point consuming any coolant at all?

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Old 11-23-2007, 10:59 AM   #4
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Old 11-24-2007, 12:12 AM   #5
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Thanks for the reply. I have one week since I replace the LIM gasket and so far the level of coolant in the tank didn't drop.
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