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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORSERVICE AND REPAIRIDLE LEARN PROCEDUREWITH MANUAL TRANSMISSION
1998 Pontiac Firebird V8-5.7L VIN G
With Manual Transmission
1998 Pontiac Firebird V8-5.7L VIN GSECTION With Manual Transmission
IDLE LEARN PROCEDURE
Anytime the PCM or the battery is disconnected or the PCM looses power, the PCM's learned position of the IAC valve pintle is lost. The engine idle is unstable when the IAC pintle position is lost. Perform the following procedure in order to return the IAC valve pintle to the correct position:
1. Turn OFF the ignition.
2. Restore the PCM battery feed.
3. Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5. Transmission in neutral.
6. Start the engine.
7. Turn ON the A/C controls.
8. Allow the engine to idle for 10 minutes.
9. Turn OFF the A/C controls.
10. Allow the engine to idle for 10 minutes.
11. Turn OFF the engine for 30 seconds.
Anytime the PCM or the battery is disconnected or the PCM looses power, the PCM's learned position of the IAC valve pintle is lost. The engine idle is unstable when the IAC pintle position is lost. Perform the following procedure in order to return the IAC valve pintle to the correct position:
1. Turn OFF the ignition.
2. Restore the PCM battery feed.
3. Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5. Transmission in neutral.
6. Start the engine.
7. Turn ON the A/C controls.
8. Allow the engine to idle for 10 minutes.
9. Turn OFF the A/C controls.
10. Allow the engine to idle for 10 minutes.
11. Turn OFF the engine for 30 seconds.
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.