SOURCE: lower intake manifold gasket leaking 02 Olds Silhouette
This is basicly a very time consuming job rather than a physically hard one to complete. In order to replace the gasket you must remove the intake plenum,throttle body, and misc. vacuum hoses. The wiring harness connections must also be disconnected. Finally the intake manifold is exposed. The bolts holding the manifold to the block are removed exposing the leaking gasket. After removing the push rods and placing them in the correct order to be replaced the gasket and sealants can be removed. Finally replace everything in reverse order. Be sure to consult a GM manual for correct bolt torch specs. The correct specs for the manifold bolts usually come with the gasket. Make sure to change your oil a few times after this job in case any coolant entered the block. Also,change the thermostat and the oil seal on the distributor half shaft cap while you have everything off. Good Luck
SOURCE: 1997 oldsmobile 88 3.8L v-6 started knocking idles
check too see if your harmoic balancer is broke,
with the engine off ,pop the hood , see if you can move the alt by hand,about a 1/2 turn either way, if you can then its broke. if not then you have other problems!!!
SOURCE: what are the lower intake manifold bolt torque
When torqueing bolts on manifolds or heads you always start in the middle or center and torque in a circle motion and olny torque 1 bolt at a time. Start with a low toque and increase torque up 5 to 10ft lbs / or newtons each time until torque spec is reached.
Tighten the vertical lower intake manifold bolts (the four middle ones) to 7 Nm (62 lb in). Tighten the diagonal lower intake manifold bolts (two on each end) to7 Nm (62 lb in). Tighten the vertical lower intake manifold bolts (the four middle ones) to 13 Nm (115 lb in). Tighten the diagonal lower intake manifold bolts (two on each end) to 25 Nm (18 lb ft).
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