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 FORMULA, 5.0 F, AUTOMATIC, 4L60/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSMISCELLANEOUS ECM CONTROLSA/C WOT CUT-OUT RELAY
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8
A/C Wot Cut-Out Relay
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8SECTION A/C Wot Cut-Out Relay
- Disconnect WOT cut-out relay harness connector. Using an ohmmeter, check continuity between relay terminals "A" and "C" and "B" and "E". Continuity should be present on these circuits.
- Using jumper wires, apply battery voltage to relay terminal "C" and ground to relay terminal "A". Continuity should not exist between relay terminals "B" and "E" while relay is energized. If continuity is not as specified, replace defective WOT cut-out relay.
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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.