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The exhaust manifolds are made of ductile cast iron with the front bank and rear bank independent INTAKE PLENUM/MANIFOLD REMOVAL (1) Perform fuel system pressure release procedure (before attempting any repairs). (2) Disconnect negative battery cable. Drain cooling system. See Cooling System, Group 7. (3) Remove air cleaner to throttle body hose (Fig. 3). FUEL SYSTEM PRESSURE RELEASE PROCE- The MPI fuel system is under a constant pres- sure of about 330 kPa (48 psi). Before servicing (a) Loosen fuel filler cap to release fuel tank pres- sure. (b) Disconnect injector wiring harness from engine harness. (c) Connect a jumper wire to ground terminal Number 1 of the injector harness (Fig. 1) to engine (d) Connect a jumper wire to the positive terminal Number 2 of the injector harness (Fig. 1) and touch Fig. 1 Injector Harness Connector Fig. 2 Intake and Exhaust Manifolds— 3.0L Engine 11 - 14 EXHAUST SYSTEM AND INTAKE MANIFOLD Ä |