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 MANUALSPONTIAC1990FIREBIRD TRANS AM, 5.0 F, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSENGINE SENSORS & SWITCHESCAMSHAFT SENSOR/HALL EFFECT SWITCH (CADILLAC EXCEPT BROUGHAM)
1990 Pontiac Firebird Trans Am, 5.0 F, Standard
Camshaft Sensor/Hall Effect Switch (CADILLAC Except Brougham)
1990 Pontiac Firebird Trans Am, 5.0 F, StandardSECTION Camshaft Sensor/Hall Effect Switch (CADILLAC Except Brougham)
- Turn ignition off. Disconnect 6-terminal, 5-wire connector at HEI distributor. Connect a DVOM to terminal "E" (pos.) and terminal "D" (neg.) on distributor side of connector. See Fig 1.
- Turn ignition on and note DVOM reading. Using ignition key, bump starter to rotate distributor. Note DVOM reading. Repeat procedure several times. DVOM should read either zero or 12 volts. Voltmeter should NOT read a steady voltage.
- Crank engine and note voltage reading. Depending on voltmeter, reading may fluctuate between zero and 12 volts or average about 6 volts. If voltmeter readings are correct, Hall Effect switch is okay.
- If voltmeter readings are not correct, turn ignition off and remove distributor. Reconnect 3-terminal connector and connect voltmeter to 6-terminal, 5-wire connector as previously described. Turn ignition on and rotate distributor by hand. Replace Hall Effect switch if voltage remains either high or low.
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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.