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 MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORSERVICE AND REPAIR
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Knock Sensor: Service and Repair
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Service and Repair
ON-VEHICLE SERVICE
Remove or Disconnect
1. Negative battery cable.
2. Drain coolant.
3. Raise vehicle.
4. Wiring harness connector from knock sensor.
CAUTION: En ine coolant may be hot. Although coo ing system has been drained, coolant still remains in engine water jacket. This coolant will drain when knock sensor is removed.
5. Knock sensor from engine block. Install or Connect
NOTE: Do not apply thread sealant to sensor threads. Sensor is coated at factory and applying additional sealant will affect the sensor's ability to detect detonation.
1. Knock sensor into engine block.
Tighten
^ Knock sensor to 19 Nm (14 ft lb).
2. Wiring harness connector to the knock sensor.
3. Lower vehicle.
4. Fill coolant.
5. Negative battery cable.
Remove or Disconnect
1. Negative battery cable.
2. Drain coolant.
3. Raise vehicle.
4. Wiring harness connector from knock sensor.
CAUTION: En ine coolant may be hot. Although coo ing system has been drained, coolant still remains in engine water jacket. This coolant will drain when knock sensor is removed.
5. Knock sensor from engine block. Install or Connect
NOTE: Do not apply thread sealant to sensor threads. Sensor is coated at factory and applying additional sealant will affect the sensor's ability to detect detonation.
1. Knock sensor into engine block.
Tighten
^ Knock sensor to 19 Nm (14 ft lb).
2. Wiring harness connector to the knock sensor.
3. Lower vehicle.
4. Fill coolant.
5. Negative battery 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.