Air passages in LIM

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11-22-2007, 02:47 PM

gafitanu

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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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11-23-2007, 09:19 AM

gafitanu

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Anybody? No ideas?

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11-23-2007, 09:56 AM

banned3800

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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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