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 MANUALSMERCURY1986CAPRI GS, 2.3 A, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSIS2.3L FEEDBACK CARBURETOR EEC IV TESTING
1986 Mercury Capri GS, 2.3 A, Standard
2.3L Feedback Carburetor EEC IV Testing
1986 Mercury Capri GS, 2.3 A, StandardSECTION 2.3L Feedback Carburetor EEC IV Testing
- Diagnosis & Testing
- Quick Test
- Circuit Tests
- How To Use Circuit Tests
- Test A - No Start
- Test B - Vehicle Battery
- Test C - Reference Voltage
- Test D - Vane Air Temperature (Vat) Sensor
- Test G - Coolant Temperature (ECT) Sensor
- Test H - Map Sensor
- Test J - Throttle Position Sensor (TPS)
- Test L - EGR Valve Regulator (EVR)
- Test M - Neutral Drive Switch-A/C Input
- Test N - Key Power Check
- Test R - Fuel Control
- Test V - Inertia Switch (Fuel Pump Circuit)
- Test W - EGR On/Off Check
- Test X - Air Management System
- Test Y - Canister Purge (CANP) Check
- Test Z - Idle Speed Control (By-Pass Air)
- Test Aa - ISC (Dc Motor) - Idle Speed Control (Dc Motor/Idle Tracking Switch Assembly)
- Test Cc - Inlet Air Solenoid (IAS)
- Test Dd - Variable Voltage Choke (VVC)
- Test Ee - Temperature Compensated Pump (TCP)
- Test Ff - Shift Indicator Light (SIL)
- Test GG - Wot A/C Cut-Out
- Test JJ - CCO
- Test KK - Dynamic Response Test
- Test Ll - Ignition Diagnostic Monitor (IDM)
- Test Mm - Spark Timing Check
- Test NN - No Codes/Codes Not Listed
- Test Oo - Erratic Ignition
- Test Pp - Pressure Feedback EGR (PFE) & EGR Valve Regulator (EVR)
- Test QQ - EGR Valve Position (EVP), EGR Valve Regulator (EVR)
- Test SS - System Check
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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.