Century V6-3100 3.1L VIN M SFI (1998)
Intake Manifold: Service and Repair
Upper Intake Manifold
REMOVAL PROCEDURE
1. Disconnect the battery ground (negative) cable.
Important: This engine uses a sequential multiport fuel injection system. Connect the injector wiring harness connectors to their appropriate fuel
injector or exhaust emissions and engine performance may be seriously affected.
2. Disconnect the vacuum hose connection from the throttle body air inlet duct.
3. Disconnect the wiring harness connection from the Intake Air Temperature (IAT) sensor in the throttle body air inlet duct.
4. Remove the throttle body air inlet duct.
5. Drain the engine coolant from the cooling system.
6. Remove the accelerator control and cruise control cables with bracket from the throttle body.
7. Disconnect the wiring harness connectors from the throttle body.
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Throttle Position (TP) sensor
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Idle Air Control (IAC) valve
8. Disconnect the (left) front spark plug wires.
9. Disconnect the wiring harness attachment clips.
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Camshaft Position (CMP) sensor wiring harness
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Left (front) spark plug wire harness
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Engine wiring harness
10. Disconnect the thermostat bypass pipe coolant hoses from the throttle body.
11. Remove the ignition coil bracket with the coils, the purge solenoid and the vacuum canister solenoid.
12. Disconnect the vacuum hose at the Manifold Air Pressure (MAP) sensor and upper intake manifold.
13. Remove the Manifold Air Pressure (MAP) sensor and the bracket.
14. Disconnect the emission control vacuum harness.
15. Disconnect the vacuum hose connections from the upper intake manifold.
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Vacuum booster hose
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Automatic transaxle vacuum modulator hose
