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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMKNOCK SENSORTESTING AND INSPECTION
1998 Pontiac Firebird V8-5.7L VIN G
Knock Sensor: Testing and Inspection
1998 Pontiac Firebird V8-5.7L VIN GSECTION Testing and Inspection
Abnormal Knock Sensor Signal:
If the PCM malfunctions in a manner which will not allow proper diagnosis of the knock sensor system, DTC PO325 will set.
DTCs PO327 and PO332 are designed to diagnose the knock sensors, and related wiring. Problems encountered with the KS system should set a DTC. However, if the customer's complaint is detonation/spark knock, use the tables for DTC PO327 or PO332 to diagnose the condition.
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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.