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 MANUALSPONTIAC1986FIREBIRD BASE, 2.5 2REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS5.0L FEEDBACK CARBURETOR "C" CHARTS
1986 Pontiac Firebird Base, 2.5 2
5.0L Feedback Carburetor "C" Charts
1986 Pontiac Firebird Base, 2.5 2SECTION 5.0L Feedback Carburetor "C" Charts
- Model Identification
- Description
- Special Diagnostic Tools
- Scan Tester Usage
- Scan Tester - Test Data Parameters
- "Scan" Diagnostic Circuit Check
- "Non-Scan" Diagnostic Circuit Check
- System Performance Check
- 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
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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.