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 - TESTS W/CODES - V8 PFICODE 33: MAP SENSOR SIGNAL BOLT HIGHNOTES
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8
Code 33: Map Sensor Signal Bolt High: Notes
1990 Pontiac Firebird Formula, 5.0 F, Automatic, 4L60/MD8SECTION Notes
- Code 33 will set the following conditions are met:
- Engine running.
- Manifold pressure is greater than specified.
- Throttle angle is less than 2 percent.
- All conditions have been met for 1-5 seconds.
Engine misfire or a low, unstable idle may set a Code 33.
2) With the MAP sensor disconnected, the ECM should recognize a low voltage. If low voltage is shown on "Scan" tester, ECM and harness are not at fault.
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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.