General Motors — Camshaft Position (CMP) Sensor Replacement
Repair & overhaul
From a General Motors service manual — check it applies to your exact model before use.
Before you start
- Do not use the old cap screws, CMP sensor screws or rotor screws; use replacement screws coated with thread locking compound
Procedure
- Disconnect the negative battery cable
- Disconnect the spark plug wires and ignition coil wire from the distributor
- Disconnect the CMP sensor harness connector from the distributor
- Remove the distributor cap screws and the distributor cap
- Remove the rotor screws and the rotor
- Align the square slot in the reluctor wheel with the CMP sensor
- Remove the CMP sensor fasteners and the CMP sensor
- Insert the CMP sensor through the reluctor wheel slot
- Install new CMP sensor mounting screws; tighten to 1.6-2.8 N·m (14-25 lb in)
- Install the rotor onto the reluctor wheel and install new rotor screws; tighten to 1.5-2.4 N·m (13-22 lb in)
- Install the distributor cap with new cap screws; tighten to 1.8-3.0 N·m (16-26 lb in)
- Connect the CMP sensor harness connector, spark plug wires, ignition coil wire and negative battery cable
Specs & values
- CMP sensor mounting screws: 1.6-2.8 N·m (14-25 Amazon eBay FridayParts $65.50 lb in)
- Rotor screws: 1.5-2.4 N·m (13-22 lb in)
- Distributor cap screws: 1.8-3.0 N·m (16-26 lb in)
Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.