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.
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HOMESERVICE MANUALSPONTIAC1987GRAND AM L4-151 2.5LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORSERVICE AND REPAIR
1987 Pontiac Grand AM L4-151 2.5L
Crankshaft Position Sensor: Service and Repair
1987 Pontiac Grand AM L4-151 2.5LSECTION Service and Repair
4-151/2.5L Engines
1. Disconnect battery ground cable.
2. Remove DIS module assembly as previously described.
3. Remove two crankshaft sensor attaching screws, then separate crankshaft sensor from DIS assembly.
4. Inspect crankshaft sensor O-ring for wear, cracks, or leakage and replace as necessary. Apply engine oil to new O-ring prior to installation.
5. Assemble sensor to DIS module assembly.
6. Insert sensor attaching screws, then torque to 20 lb in
7. Install DIS module assembly as previously described.
8. Connect battery ground cable.
RENDER: 1.0x
NO RELATED
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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.