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NOTE: There are two procedures available to install the distributor. Use Installation Procedure 1 when the crankshaft has NOT been rotated from the original position. Use Installation Procedure 2 when any of the following components are removed: ^ The intake manifold ^ The cylinder head ^ The camshaft ^ The timing chain or sprockets ^ The complete engine If the malfunction indicator lamp (MIL) turns on and DTC P1345 sets after installing the distributor, this indicates an incorrectly installed distributor. Engine damage or distributor damage may occur. Use Procedure 2 in order to install the distributor. 1. Turn OFF the ignition. Remove air cleaner assembly. Remove the spark plug wires from the distributor cap ^ Twist each spark plug boot 1/2 turn. ^ Pull only on the wire boot in order to remove the wire from the distributor cap. 2. Remove the electrical connector from the base of the distributor. 3. Remove the two screws that hold the distributor cap to the housing. 4. Discard the screws. 5. Remove the distributor cap from the housing. Use a grease pencil in order to note the position of the rotor in relation to the distributor housing (1). 7. Mark the distributor housing and the intake manifold with a grease pencil. 8. Remove the mounting clamp hold down bolt. 9. Remove the distributor. 10. As the distributor is being removed from the engine, watch the rotor move in a counter-clockwise direction about 42 degrees. This will appear as slightly more than 1 clock position. 11. Note the position of the rotor segment. 12. Place a second mark on the base of the distributor (2). This will aid in achieving proper rotor alignment during the distributor installation. INSTALLATION PROCEDURE 1

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Important: The upper intake does not have to be removed to remove the lower intake manifold. Disconnect the breather tube at the air cleaner outlet duct. 2. Remove the air cleaner outlet duct retaining wingnut. 3. Disconnect the IAT sensor harness connector. 4. Remove the air cleaner outlet duct from the throttle body. Disconnect the accelerator cable from the throttle body. Disconnect the accelerator cable from the throttle body. 7. Disconnect the cruise control cable, if equipped from the throttle shaft and the accelerator cable bracket. 8. Disconnect the vacuum hose from the intake manifold for the vacuum tank. 9. Remove the power brake booster vacuum hose. 7. Disconnect the cruise control cable, if equipped from the throttle shaft and the accelerator cable bracket. 8. Disconnect the vacuum hose from the intake manifold for the vacuum tank. 9. Remove the power brake booster vacuum hose. 11. Disconnect the following electrical connectors: The fuel meter body assembly (1) The Manifold Absolute Pressure (MAP) sensor(3) The EVAP canister purge solenoid valve (2) Remove the engine wire harness clip from the accelerator cable bracket. 13. Move the engine wiring harness aside. Remove the engine wire harness clip from the accelerator cable bracket. 13. Move the engine wiring harness aside. 15. Remove the accelerator and cruise control cable bracket from the throttle body. Leave the accelerator and cruise control cables on the bracket.

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1. Disconnect the battery negative cable. Refer to Battery Replacement. 2. Remove the upper fan shroud. Refer to Fan Shroud Replacement in Cooling System. 3. Disconnect the power brake booster vacuum hose. 4. Remove the air cleaner outlet resonator. Refer to Air Cleaner Outlet Resonator Replacement. 5. Disconnect the following electrical connectors: Idle Air Control (IAC) motor (1) Manifold Absolute Pressure (MAP) sensor (4) Throttle Position (TP) sensor (2) 6. Disconnect the fuel injector harness electrical connector. 7. Remove the fuel injector harness electrical connector from the bracket on the valve rocker arm cover. 8. Remove the engine wiring harness from the bracket. 9. Move and secure the engine wiring harness out of the way. 10. Disconnect the heating and air conditioning control vacuum source hose. 11. Disconnect the EVAP emission purge tube from the throttle body. 12. Remove the bolt holding the EVAP emission canister purge harness and if equipped the transmission fluid fill tube. 13. Remove the nut holding the engine wiring harness clip to the intake manifold. 14. Remove the nut holding the engine wiring harness clip to the intake manifold rear lower stud. 15. Disconnect the fuel hose from the fuel rail. Refer to Fuel Rail Assembly Replacement. 16. Remove the accelerator control cable from the throttle body. Refer to Accelerator Controls Cable Replacement. 17. Remove the cruise control cable from the throttle body. Refer to Cruise Control Cable Replacement.

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1. On vehicles equipped with a manual transmission, remove the shift lever. 2. On vehicles equipped with an automatic transmission, perform the following steps: 2.1. Apply the park brake. 2.2. Insert the ignition key and turn the ignition switch to the RUN position. 2.3. Depress the brake pedal and shift the transmission to the 1 position. 2.4. Turn the ignition switch to the OFF position. CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices. 3. 4. 5. 6. 7. 8. 9. 10. Disconnect the battery negative cable. Remove the left sound insulator. Remove the right instrument panel sound insulator. If the vehicle is equipped with a multiple CD changer located in the center console, remove the center console. Remove the center sound insulator. Remove the lower left instrument panel mounting bolt. Remove and retain the instrument panel storage compartment. Remove the lower right instrument panel mounting bolt. 11. Remove and retain the left and right speakers and the speaker grilles. 12. Use a flat-bladed tool in order to remove the windshield defroster grille. Retain the grille and sunload sensor for use on the next IP carrier. 13. 14. 15. 16. If equipped with a sun load temperature sensor twist the sensor 1/4 turn counterclockwise in order to disengage. Disconnect the brown electrical connection from the body control module (BCM). Disconnect the purple electrical connection from the body control module (BCM). Remove the knee bolster. 1998 Chevy Truck S10/T10 Blazer 2WD V6-4.3L VIN W 17. Remove and retain the instrument cluster. 18. Remove and retain the radio. 19. Remove the HVAC control assembly. CAUTION: Refer to SIR Handling Caution in Cautions

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CIRCUIT DESCRIPTION This chart assumes that the battery condition and engine cranking speed are OK, and there is adequate fuel the tank. This chart should be used on engines using the Model 700 throttle body. TEST DESCRIPTION Number(s) below refer to circled number(s) on the diagnostic chart: 1. A “Service Engine Soon” light “ON” is a basic test to determine if there is a 12 volt supply and ignition 12 volts to ECM. No ALDL may be due to an ECM problem and CHART A-2 will diagnose the ECM. If TPS is over 2.5 volts the engine may be in the clear flood mode which will cause starting problems. If coolant sensor is below -30° C, the ECM will provide fuel for this extremely cold temperature which will severely flood the engine. 2. Voltage at the spark plug is checked using spark tester tool ST-125 (J 26792) or equivalent. No spark indicates a basic ignition problem. 3. While cranking engine there should be no fuel spray with injector disconnected. Replace an injector if it sprays fuel or drips like a leaking water faucet. 4. Use an injector test light like J 34730, BT-8329A or equivalent, to test injector circuit. A blinking light indicates the ECM is controlling the injector. 5. This test will determine if there is fuel pressure at the injector and that the injector is operating. DIAGNOSTIC AIDS If no trouble is found in the fuel pump circuit or ignition system and the cause of a “Engine Cranks But Will Not Run” has not been found, check for: