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 FORMULA, 5.0 H, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM5.0L FEEDBACK CARBURETOR TESTS W/CODES
1987 Pontiac Firebird Formula, 5.0 H, Automatic
5.0L Feedback Carburetor Tests W/Codes
1987 Pontiac Firebird Formula, 5.0 H, AutomaticSECTION 5.0L Feedback Carburetor Tests W/Codes
- Model Identification
- Description
- Diagnostic System Operation
- 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
- Special Diagnostic Tools
- Scan Tester Usage
- Scan Tester - Test Data Parameters
- "Scan" Diagnostic Circuit Check
- "Non-Scan" Diagnostic Circuit Check
- System Performance Check
- Chart A1 - Dwell Fixed Under 10°
- Chart A2 - Dwell Fixed Between 10-45° Or 50°
- Chart A3 - Dwell Fixed Over 45 Or 50°
- Chart A5 - "Service Engine Soon" Light Inoperative
- Chart A6 - Won't Flash Code 12
- Code 12 - No Distributor Reference Pulses
- Code 13 - Open Oxygen Sensor Circuit
- Code 14 - Coolant Sensor Shorted
- Code 15 - Coolant Sensor Open
- Code 21 - TPS Circuit High
- Code 22 - TPS Circuit Low (5.0L VIN Y)
- Code 23 - M/C Solenoid Circuit Low
- Code 24 - Vehicle Speed Sensor (VSS)
- Chart 24B - Park/Neutral Circuit (P/N)
- Code 32 - BARO Sensor
- Code 34 - Differential Press. (Vac) Sensor
- Code 41 - No Distributor Reference Signal
- Code 42 - Electronic Spark Timing (Est)
- Code 43 - Elect Spark Control (ESC) Voltage Low To ECM
- Code 44 - Lean Exhaust Indication
- Code 45 - Rich Exhaust Indication
- Code 51 - Prom
- Code 53 - EGR Control Error (5.0L VIN G & H)
- Code 54 - M/C Solenoid Circuit High
- Chart C1 - ECM Replacement Check Chart
- Chart C1D - Map & BARO Check
- Chart C1E - Differential Press (Vac) Sensor
- Chart C2B - Idle Stop Solenoid (5.0L)
- Chart C2C - ILC Check (5.0L VIN Y)
- Chart C2D - Rear Vacuum Break (RVB) (5.0L VIN Y)
- Chart C2F - TPS Enrichment Check
- Chart C4A - IGN System Check With Integral Coil
- Chart C4K - Est Performance Check
- Chart C5 - Electronic Spark Control
- Chart C6A - Air Management Check (Ed/Es)
- Chart C7A - PWM EGR (5.0L VIN G & H)
- Chart C7C - EGR (5.0L VIN Y)
- Charts C8A1 & C8A2 - TCC
- Chart C8A-2 - Transmission/Transaxle Converter Clutch (TCC)
- Chart C8B - Manual Transmission Shift Light (5.0L VIN G & H)
- Chart C9C - Vacuum Actuated EFE System Check (5.0L)
- Chart C10C - A/C Cut-Out Relay (5.0L VIN Y)
- Component Locations (5.0L)
- ECM Terminal Identification
- Wiring Diagrams
RENDER: 1.0x
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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.