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 MANUALSPONTIAC1987FIREBIRD BASE, 2.8 S, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (2.0L VIN [K] / 2.5L VINS [R & U] TESTS W/CODES)
1987 Pontiac Firebird Base, 2.8 S, Standard
Section 12 (2.0L VIN [K] / 2.5L VINS [R & U] Tests W/Codes)
1987 Pontiac Firebird Base, 2.8 S, StandardSECTION Section 12 (2.0L VIN [K] / 2.5L VINS [R & U] Tests W/Codes)
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1987 Pontiac Sunbird, 1987 Pontiac Grand Am, 1987 Pontiac Fiero, 1987 Pontiac 6000, and 1987 Oldsmobile Firenza. However, it is still accessible from the selected car via links, so may be relevant.
- Model Identification
- Description
- Diagnostic System
- Basic Diagnostic Procedure
- Entering Or Exiting Diagnostic Mode (Non-Scan)
- Reading Trouble Codes
- ECM Trouble Code Definitions
- Trouble Code Determination (Hard Or Intermittent)
- Clearing Trouble Codes
- Diagnostic Materials
- Field Service Mode Check (Fuel Injected Models)
- Special Diagnostic Tools
- Scan Tester Usage
- Scan Tester - Test Data Parameters
- Chart Information For 1987 2.0L VIN K & 2.5L
- "Scan" Diagnostic Circuit Check (A/J/N/P Body)
- Diagnostic Charts
- Chart A1: No "Service Engine Soon" Light (A/J/N/P Body)
- Chart A2 - No Code 12, "SES" Light On Steady (A/J/N/P Body)
- Chart A3 - Engine Cranks But Won't Run (1 Of 2) (J Body)
- Chart A3 - Engine Cranks But Won't Run (2 Of 2) (J Body)
- Chart A3 - Cranks But Won't Run (1 Of 3) (A/N/P Body)
- Chart A3 - Engine Cranks But Won't Run (2 Of 3) (A/N/P Body)
- Chart A3 - Engine Cranks But Won't Run (3 Of 3) (A/N/P Body)
- Chart A5 - Fuel Pump Relay (A/J/N/P Body)
- Chart A7 - Fuel System Diagnosis (1 Of 2) (A/J/N/P Body)
- Chart A7 - Fuel System Diagnosis (2 Of 2) (A/J/N/P Body)
- Code 13 - Open Oxygen (O2) Sensor CKT (A/J/N/P Body)
- Code 14 - Coolant Temperature Sensor (Cts) Signal Voltage Low (A/J/N/P Body)
- Code 15 - Coolant Temperature Sensor (Cts) Signal Voltage High (A/J/N/P Body)
- Code 21 - TPS Signal Voltage High (A/J/N/P Body)
- Code 22 - TPS Signal Voltage Low (A/J/N/P/ Body)
- Code 23 - Mat Sensor Temp Low (A/J/N/P Body)
- Code 24 - Vehicle Speed Sensor (VSS) (N Body)
- Code 24 - Vehicle Speed Sensor (VSS) (A/J Body)
- Code 24 - Vehicle Speed Sensor (VSS) (P Body)
- Code 25 - Mat Sensor Temperature High (A/J/N/P Body)
- Code 33 - Map Sensor Signal Voltage High (A/J/N/P Body)
- Code 34 - Map Sensor Signal Voltage Low (A/J/N/P Body)
- Code 35 - Idle Speed Error (A/J/N/P Body)
- Code 42 - Electronic Spark Timing (Est) (J Body)
- Code 42 - Electronic Spark Timing (Est) (A/N/P Body)
- Code 44 - Lean Exhaust Indication (A/J/N/P Body)
- Code 45 - Rich Exhaust Indication (A/J/N/P Body)
- Code 51 - Faulty Prom (A/J/N/P Body)
- Code 53 - System OVERVOLTAGE (A/J/N/P Body)
- Chart C1 - ECM Replacement Check Chart
- Chart C1A - Park/Neutral Switch A/T (A/J/N/P Body)
- Chart C1D - Map Output Check (A/J/N/P Body)
- Chart C1E - P/S Pressure Switch (A/J/N/P Body)
- Chart C4C - Ignition System Check (J Body)
- Chart C4D1 - "Dis" Misfire At Idle (A/N/P Body)
- Chart C4D2 - "Dis" Misfire Under Load (A/N/P Body)
- Chart C7A - EGR Valve Check (A/J/N/P Body)
- Chart C8 - 125C TCC (A/J/N/P Body)
- Chart C8B - M/T Shift Light (A/J/N/P Bodies)
- Chart C10 - A/C Clutch Control (2.0L Engine)
- Chart C10 - A/C Clutch Control (2.5L Engines)
- Chart C12 - Engine Cooling Fan (N Body)
- Chart C12 - Engine Cooling Fan (A/J/P Body)
- Component Locations
- ECM Terminal Id
- Wiring Diagrams
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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.