Camshaft Position Sensor Replacement (7.4L)
Removal Procedure
Caution:Refer to
Caution:Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
For Vehicles equipped with OnStar® (UE1) with Back Up Battery:
The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.
in Cautions and Notices.
1. Disconnect negative battery cable.
2. Remove the ignition coil.
3. Remove the spark plug wires from one side of the distributor cap and set them aside.
4. Disconnect the camshaft sensor electrical connector.
5. Remove the distributor cap screws.
6. Remove the distributor cap.
7. Remove the two screws from the rotor.
8. Remove the rotor.
9. Line up the square-cut hole in the rotor vane with the CMP sensor.
10. Remove the two screws that hold the camshaft position (CMP) sensor.
11. Remove the camshaft position (CMP) sensor from the distributor.
Installation Procedure
Important:Do not use the old cap screws, CMP sensor screws, or the distributor rotor screws. Use replacement screws that have been coated with a thread locking compound. Precoated replacement cap and CMP sensor screws can be aquired using P/N 10475922 (pkg of 10 screws). Precoated replacement rotor screws can be aquired using P/N 10475924 (pkg of 10 screws).
1. Install the camshaft position (CMP) sensor in the distributor.
Notice:Refer toFastener Noticein Cautions and Notices.
2. Install the two screws that hold the CMP sensor in place.
Tighten:
Tighten the screws to 2.2 [n-m] (19 lb in).
3. Install the rotor.
4. Install the two screws in the rotor.
Tighten:
Tighten the screws to 1.9 [n-m] (18 lb in).
5. Install the distributor cap.
6. Install the distributor cap screws.
Tighten:
Tighten the screws to 2.4 [n-m] (22 lb in).
7. Install the CMP sensor electrical connector.
8. Install the spark plug wires on the distributor cap.
9. Install the ignition coil.
10. Connect negative battery cable.