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 MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 18 (ENGINE CONTROLS - BASIC TESTING)
1990 Pontiac Grand Prix STE, 3.1 V
Section 18 (Engine Controls - Basic Testing)
1990 Pontiac Grand Prix STE, 3.1 VSECTION Section 18 (Engine Controls - Basic Testing)
WARNING: This page does not describe the selected car, but rather 39 other vehicles, including the 1992 Saturn SL2, 1992 Saturn SL1, 1992 Saturn SL, 1992 Saturn SC, and 1992 Pontiac Sunbird. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- General Motors A & C Chart Reference
- Preliminary Inspection & Adjustments
- No Start Diagnosis (A-3)
- Notes
- Engine Controls - Basic Testing
- No Start - Engine Cranks OK (1.9L SATURN)
- No Start - Engine Cranks OK (PFI & TBI W/HEI Distributor, Except 4.9L CADILLAC)
- No Start - Engine Cranks OK (4.9L CADILLAC W/HEI Distributor)
- No Start - Engine Cranks OK (2.5L TBI W/Dis)
- No Start - Engine Cranks OK (2.0L Port Fuel Injection W/Dis)
- No Start - Engine Cranks OK (2.2L Port Fuel Injection W/Dis)
- No Start - Engine Cranks OK (3.1L & 3.4L PFI W/Dis)
- No Start - Engine Cranks OK (2.3L PFI W/IDI)
- No Start - Engine Cranks OK (PFI W/C3I)
- No Start - Engine Cranks OK (Corvette OPTI-Spark)
- Basic Fuel System Checks (A-7)
- Basic Ignition System Checks (C-4)
- Idle Speed & Ignition Timing
- Diagnostic Circuit Check (Except PFI CADILLAC)
- Summary
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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.