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 MANUALSCHEVROLET1992CAVALIER RS, 2D CONVERTIBLE, 3.1 T, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 4 (ENGINE CONTROLS - TESTS W/CODES - 3.3L PFI)PCM/BCM CODE CHARTSCODE 48, MISFIRE DIAGNOSISNOTES
1992 Chevrolet Cavalier RS, 2D Convertible, 3.1 T, Standard
Code 48, Misfire Diagnosis: Notes
1992 Chevrolet Cavalier RS, 2D Convertible, 3.1 T, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1992 Pontiac Grand Am, 1992 Oldsmobile Cutlass Cruiser, 1992 Oldsmobile Cutlass Ciera, 1992 Oldsmobile Achieva, and 1992 Buick Skylark. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If multiple codes are present, go to lowest code first. Repairing Code 13, 44 or 45 may correct Code 48.
Code 48 will set if TPS is .58-1.02 volts, RPM is 1500-2500, MPH is 50-60, O2 sensor cross counts are greater than 32 (except 4T60 transmission) or 26 (4T60 transmission), and all of these conditions are met for 30 seconds.
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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.