Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Chevrolet Uplander V6-3.9LFACTORY OEM SERVICE PROCEDURE
Ignition Cable: Service and Repair
Spark Plug Wire Replacement
Removal Procedure
Notice: Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
1. Remove the intake manifold cover.
2. Disconnect the left side spark plug wires from the spark plugs.
3. Disconnect the left side spark plug wires from the ignition coil.
4. If replacing only one plug wire, open the retaining clips and remove the spark plug wire.
5. Remove the left side spark plug wire clips from the intake manifold bracket and heater inlet and outlet pipe.
6. Remove the spark plug wire assembly.
7. Rotate the engine for access to the back of the engine. Refer to Rotating the Engine for Service Access.
8. Disconnect the left side spark plug wires from the spark plugs.
9. Disconnect the right side spark plug wires from the ignition coil.
10. If replacing only one plug wire, open the retaining clips and remove the spark plug wire.
11. Remove the right side spark plug wire clip from the ignition coil bracket.
12. Remove the spark plug wire assembly.
Installation Procedure
1. Install the spark plug wire assembly.
2. Install the right side spark plug wire clip at the ignition coil bracket.
3. If only one plug wire was replaced, install the plug wire and close the retaining clip.
4. Connect the right side spark plug wires to the ignition coil.
5. Connect the right side spark plug wires to the right side spark plugs.
6. Rotate the engine back to the original position. Refer to Rotating the Engine for Service Access.
7. Install the spark plug wire assembly.
8. Install the left side spark plug wire clips at the intake manifold bracket and heater inlet and outlet pipe.
9. If only one plug wire was replaced, install the plug wire and close the retaining clips.
10. Connect the left side spark plug wires to the ignition coil.
11. Connect the left side spark plug wires to the spark plugs.
12. Install the intake manifold cover.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.