2002 Buick LeSabre Intake Manifold Gasket
This LeSabre came in for preventative maintenance in the form of replacing the lower intake manifold gaskets.
We're suspecting the gasket is getting weak because the coolant showed some signs of possible corrosion and gunk that can be associated with those gaskets beginning to fail. This can be a risky thing to ignore, and can very easily cause major damage to the engine. Click this link for more details. This is a very common failure.
Let's get right into the project. Select the pictures to follow along and get more details.
Stage 1: Upper Intake Plenum
The lower intake is located beneath the upper intake plenum (makes sense). The upper plenum is beneath or behind several other components. We'll remove and inspect those first.
Stage 2: The Lower Intake Manifold
Now it's time to remove and inspect the lower manifold. Let's see what those gaskets look like.
Stage 3: The Water Pump
With the cooling system showing signs of corrosion, and 125k on the odometer we'll also replace the water pump as preventative maintenance.
Stage 4: The New Upper Intake Plenum/Putting it Back Together
Since we observed signs of heat stress in the old upper plenum, we're going to replace it along with the gaskets associated with it.
That's a Wrap
After bleeding the cooling system of air pockets, this job was done. One more 3800 series engine with no more intake manifold gasket concerns.