Lim

[ppav59]

I keep reading about LIM problems & leaking.

What is a LIM ?

[Gagt518]

I keep reading about LIM problems & leaking.

What is a LIM ?

Lower Intake Manifold

[rixGAphx]

You don't have one.

Stop worrying.

Nearly every car engine has an Intake Manifold: The aluminum (sometimes plastic) casting with passages that carry intake air from the Throttle Body to the cylinderhead and thence to the valves/cylinders.

The GA 4-cyl engines have a simple, one-piece Intake Manifold that is almost never a problem.

On the GM 60* V6 engine, in 3100 and 3400 displacements as used on '94-'05 GA's, the intake manifold consists of an upper piece and a lower piece slapped into the 'V' between the cylinder heads.
These are the UIM (Upper) and LIM (Lower) Intake Manifolds.

There was a gasket to seal the space between the LIM and the cylinderheads (2 heads, therefore 2 gaskets), called the LIM gasket.
Because of great thermal expansion of the IM assembly, the gasket almost always develops a leak, and coolant (water + antifreeze) flowing thru the gasket either leaks to the outside of the engine or down into the crankcase.
GM developed an improved gasket around 2003 to make this less problematic.
It takes a skilled mechanic 5-7 hours to tear abpart the top of the engine to replace the $75 set of 2 LIM gaskets.

Your engine has its own little proclivities, but nothing like the LIM gasket leak that's endemic to all pre-'03 GM 60* V6's.

Hope this helps,
-Rick

[Pontiac]

So the issue was corrected in '03, or at least "Better attended to by the designers"?? Good to hear.

[HeyDace]

A latteral injection modulator. (LIM)

[Coondog]

:lol:Luck Indicator Module....