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 MANUALSOLDSMOBILE1987FIRENZA S, 2.0 K, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMV6/V8 PFI COMPONENT TEST
1987 Oldsmobile Firenza S, 2.0 K, Standard
V6/V8 PFI Component Test
1987 Oldsmobile Firenza S, 2.0 K, StandardSECTION V6/V8 PFI Component Test
- Model Identification
- Description
- Diagnostic System Operation
- Basic Diagnostic Procedure
- Diagnostic Materials
- Field Service Mode Check (Fuel Injected Models)
- Special Diagnostic Tools
- Scan Tester Usage
- Scan Tester - Test Data Parameters
- Diagnostic Circuit Check (All Engines)
- "Scan" Diagnostic Circuit Check
- Chart A1 - No "Service Engine Soon" Light (2.8L)
- Chart A1 - No "SES" Light (5.0/5.7L)
- Chart A2 - Won't Flash Code 12 "SES" Light Always On
- Chart A3 - Engine Cranks, But Won't Run (2.8L)
- Chart A3 - Engine Cranks, But Won't Run (5.0/5.7L)
- Chart A7 - Fuel System Diagnosis (2.8L)
- Chart A7 - Fuel System Diagnosis (5.0/5.7L)
- Chart A9 - Cold Start Valve (All Engines)
- Chart C1D - Map Output Check (All Engines)
- Chart C1E - PSPS Check (All Engines)
- CHART C2C - IDLE AIR CONTROL (IAC) (All ENGINES)
- Chart C3 - Canister Purge Check (All Engines)
- Chart C4A - Ignition System Check (5.0/5.7L)
- Chart C4B - Ignition System Check (2.8L)
- Chart C4F - Dis Misfire (2.8L)
- Chart C5 - ESC Check (All Engines)
- Chart C6A - Electric Control (Man. Trans.) (2.8L)
- Chart C6B - Air Management Check (5.0/5.7L)
- Chart C7 - EGR Valve Check (2.8L)
- Chart C7A - EGR Check (2.8L)
- Chart C7B - EGR RECIRCULATION Check (5.0/5.7L)
- Chart C8A - TCC (All 2.8L)
- Chart C8B - TCC (2.8L "F" Body)
- Chart C8B - TCC (2.8L "A" Body)
- Chart C8A - TCC (5.0L/5.7L)
- Chart C8B - Man. Trans. Shift Light (5.0/5.7L)
- Chart C10 - A/C Clutch Control (2.8L)
- Chart C12 - Cooling Fan Control Circuit (2.8L)
- Chart C12 - Cooling Fan Control Circuit (5.0/5.7L)
- Component Locations
- 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.