SOURCE: Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold
On 5.7L engines, install the bolts and torque in sequence as follows:
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: vacuum leak
mine is doing the same, it's your pcv receptor on the manifold. that hard plastic cover is actually part of the intake itself, if it "came off" it would cut your intake in half. that seem seals the two halfs together. you gotta pull the whole intake off and replace it... or jimmy rig it.
SOURCE: intake manifold gasket / replace
3.8L Engine
NOTE
The 3.8L (VIN K) non-supercharged engine uses a two-piece intake
manifold consisting of an upper air plenum which mounts the throttle
body and a lower intake manifold assembly which houses the fuel
injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower
intake manifold. The supercharger serves as the upper manifold.
Lower Manifold
NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible only after the upper intake manifold is removed.
These bolts are located in the right front and left rear corners of the
lower intake manifold. Remove the upper intake manifold to service the
lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold
similar to the 3.8L (VIN K), but the supercharger serves as the upper
manifold.
To install:
Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine
Upper Intake Manifold (Plenum)
NOTE
Two bolts which fasten the lower intake manifold to the cylinder
head are accessible are accessible only after the upper intake manifold
is removed. These bolts are located in the right front and left rear
corners of the lower intake manifold.
Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
To install:
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