Yukon/Denali 2WD V8-5.3L VIN Z Flex Fuel (2005)
6. Remove the knock sensor harness connector from the intake manifold.
7. Remove the connector position assurance (CPA) retainer.
8. Disconnect the following electrical connectors from both sides of the engine:
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Main coil (2)
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Fuel injectors
9. Remove the harness clips from the fuel rail (1).
10. Reposition the upper engine wire harness aside.
11. Perform the following steps in order to disconnect the fuel injector electrical connectors:
IMPORTANT: When disconnecting the Multec(R) 2 fuel injector connectors, DO NOT use pliers or other hand tools, as the connector ends may
become mangled and be rendered unusable.
1. Mark the connectors to their corresponding injectors to ensure correct reassembly.
2. Pull the connector position assurance (CPA) retainer (2) on the connector up 1 click.
3. Push the tab (1) on the connector in.
4. Disconnect the fuel injector connector electrical connector.
5. Repeat the steps for each injector connector.
12. Remove the positive crankcase ventilation (PCV) hose.
