S15/T15 2WD P/U V6-262 4.3L VIN W CPI (1993)
Intake Manifold: Service and Repair
1.
Disconnect battery ground cable.
2.
Drain engine coolant from radiator, then remove plastic cover.
3.
Disconnect engine wiring harness from throttle position sensor, idle air control motor, MAP sensor and communicator valve.
4.
Disconnect throttle and T.V. linkage from upper intake manifold.
5.
Remove ignition coil, then disconnect PCV hose from rear of upper intake manifold.
6.
Disconnect vacuum hoses at front and rear of upper intake manifold.
7.
Remove upper intake manifold bolts and studs. Mark location of bolts and studs for assembly reference.
8.
Remove upper intake manifold.
9.
Remove distributor and distributor wiring. Mark relationship of distributor housing and rotor for installation reference.
10.
Remove upper radiator hose from thermostat housing, then the heater hose at lower intake manifold.
11.
Disconnect fuel supply and return lines at rear of lower intake manifold.
12.
Remove brace from lower intake manifold to A/C Compressor brace.
13.
Disconnect engine wiring harness from fuel injector, EGR valve and coolant temperature sensor.
14.
Remove lower intake manifold bolts, then the manifold from the vehicle.
Fig. 8 Lower Intake Manifold Tightening Sequence
Fig. 9 Upper Intake Manifold Tightening Sequence
15.
Reverse procedure to install, noting the following:
a.
Apply RTV to the front and rear sealing surfaces on the block.
b.
Apply a 3/16 inch bead of RTV to the front and rear of the block, extend bead 1/2 inch up each cylinder head to seal and retain gaskets.
c.
Apply sealer part No. 1052080 or equivalent to lower intake manifold bolts.
d.
Torque lower intake manifold bolts to 35 ft. lbs. using tightening sequence shown in Fig. 8.
e.
Torque upper intake manifold bolts to 124 inch lbs. using tightening sequence shown in Fig. 9.
