SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)
do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?
SOURCE: need how to find TDC on 4.3 v-6
Remove # 1 plug and stick your finger in the hole, roll the engine over by hand, when you start to feel pressure in the cylinder you are near TDC, just check the crank pulley marks to zero it to TDC mark on pulley.
SOURCE: How to install intake manifold gaskets and their location.
go to autozone.com and register free then select make year ect.
select repair info (you have to register 4 this)
step by step and photos!!!!
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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