Hello,
Here is a detailed summary on the procedure of how to replace the intake manifold gasket on a 1996 gmc jimmy;
REMOVING THE UPPER INTAKE MANIFOLD(PLENUM)
STEP 1
Disconnect Battery (may not be absolutely necessary, but a good practice to avoid shorting a positive wire to ground).
STEP 2
Remove serpentine belt.
STEP 3
Drain the coolant.
STEP 4
Remove air cleaner ducting and disconnect wires.
STEP 5
Disconnect throttle linkage and bracket.
STEP 6
Disconnect cruise control cable.
STEP 7
Remove brake booster vacuum hose at manifold.
STEP 8
Remove PCV hose.
STEP 9
Remove ignition coil and bracket.
STEP 1O
Remove purge solenoid and bracket.
STEP 11
Relieve fuel pressure at test port.
STEP 12
Remove fuel lines and bracket.
STEP 13
Remove upper intake manifold.
REMOVING THE LOWER INTAKE MANIFOLD
STEP 1
Remove the distributor and label the spark plug wires.
STEP 2
Remove heater hoses and bypass hose.
STEP 3
Remove upper radiator hose.
STEP 4
Remove EGR valve?
STEP 5
Remove sensors and bracket on right side.
STEP 6
Remove EGR tube, clamp and bolt.
STEP 7
Remove PCV valve (and replace).
STEP 8
Unbolt A/C compressor and move it aside.
STEP 9
Loosen compressor bracket and slide forward, but do not remove it.
STEP 10
Remove alternator bracket bolt (or remove alternator and set aside)
STEP 11
Unplug all vacuum lines from intake manifold.
STEP 12
Unplug all electrical connectors from manifold.
STEP 13
Take note of the intake manifold bolts and mark the location of the bolts.
STEP 14
Remove intake manifold bolts, and manifold.
STEP 15
Clean mating surfaces
THE MAIN INSTALLATION
STEP1
Set the new gaskets in place and apply silicone to flat areas on front and rear of engine block.
STEP2
Apply thread locking compound to manifold bolts.
STEP 3
Install the manifold and tighten bolts to 35 ft-lbs, in proper sequence.
STEP4
Install the distributor.
STEP5
Install the upper intake manifold.
The remaining installation procedures are basically the reverse of removal.
Have a nice day.
SOURCE: im replacing my intake manifold gasket in my 2000
BE VERY CAREFUL WHEN CLEANING CATCH ALL DEBRIE IN A RAG THIS WOULD BE A GOOD TIME FOR TUNE UP IF NEEDED. MAKE SURE YOU CLEAN CLEAN CLEAN IF THIS HAS 4.3 BE CAREFUL ON INTAKE TORQUE. CHANGE COOLANT IF OVER 60,000 ON VEH. WITH MANUFACTURE SPEC. COOLANT.
Testimonial: "Ah!!! Thanx for the advice grately appreciate it."
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