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 MANUALSPONTIAC1991SUNBIRD SE, 3.1 T, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODES
1991 Pontiac Sunbird SE, 3.1 T, Standard
Engine Controls - Tests W/O Codes
1991 Pontiac Sunbird SE, 3.1 T, StandardSECTION Engine Controls - Tests W/O Codes
- Introduction
- Symptoms
- Hard Start - Cold (CARBURETED Models)
- Hard Start - Hot (CARBURETED Models)
- Hard Start (EFI Models)
- Stall After Start - Cold (CARBURETED Models)
- Stall After Start - Hot (CARBURETED Models)
- Stalls After Starting (EFI Models)
- Hesitation, Sag Or Stumble (CARBURETED Models)
- Hesitation, Sag Or Stumble (EFI Models)
- Vehicle Surges
- Lack Of Power Or Sluggish
- Engine Backfires
- Cuts Out, Misses
- Rough, Unstable Or Incorrect Idle
- Engine Will Not Idle (CARBURETED Models)
- Engine Will Not Idle (EFI Models)
- Poor Fuel Economy
- Engine Dieseling/Run-On
- Detonation/Spark Knock
- Excessive Exhaust Emission (Odors)
- Intermittent Problem Diagnosis
- Test Procedures
- Intermittent Trouble Shooting
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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.