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DIAGNOSIS AND TESTING INTAKE MANIFOLD LEAKS An intake manifold air leak is characterized by lower than normal manifold vacuum. Also, one or WARNING: USE EXTREME CAUTION WHEN THE (1) Start the engine. the suspected leak area. (3) If engine RPM’S change, the area of the sus- pected leak has been found. (4) Repair as required. INTAKE MANIFOLD - UPPER REMOVAL (1) Disconnect negative cable from battery. ture sensor (Fig. 104). (3) Disconnect air intake tube at throttle body and remove upper air cleaner housing. (4) Disconnect connector from throttle position sensor (TPS) (Fig. 106). (5) Disconnect connector from idle air control (IAC) motor (Fig. 106). (6) Disconnect connector from MAP sensor (Fig. 105). (7) Remove vacuum lines for purge solenoid and PCV valve at intake manifold. (8) Remove vacuum lines for power brake booster, LDP, EGR transducer, and speed control vacuum res- (9) Disconnect throttle and speed control (if equipped) cables from throttle lever and bracket. (10) Remove the EGR tube. (Refer to 25 - EMIS- SIONS CONTROL/EXHAUST GAS RECIRCULA- (11) Remove the upper manifold support bracket bolt to manifold (Fig. 107). Fig. 104 Inlet Air Temperature Sensor - 2.4L Fig. 105 Map Sensor - 2.4L 1 - MAP SENSOR Fig. 106 Throttle Body Electrical Connectors - Typical 1 - IDLE AIR CONTROL MOTOR CONNECTOR RS ENGINE 2.4L 9 - 61 INTAKE MANIFOLD (Continued) |