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.
1986 Merkur XR4Ti AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Injection System - Ford MPI
- Description
- Operation
- Testing
- Fuel Pump
- Low Pressure Fuel Pump
- Inertia Switch
- Fuel Pump Circuit Fuse
- In-Line Fuse
- Relay To Fuse Continuity
- Power Feed To Relay Points
- Power Feed To Relay Coil
- Relay To EEC Continuity
- Low Pressure Pump Feed Circuit
- Low Pressure Pump Ground Circuit
- High Pressure Fuel Pump
- High Pressure Fuel Pump Feed Circuit
- High Pressure Fuel Pump Operational
- High Pressure Fuel Pump Ground Circuit
- Fuel Pump Relay
- Fuel Pump Pressure & Volume
- Fuel Pressure Regulator
- Fuel Injector
- Control Circuit Continuity
- Fuel Injector Functional
- Idle Speed Controller
- Removal & Installation
- Wiring Diagram
Factory Service Tools
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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.