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.
1978 Lincoln VersaillesFACTORY OEM SERVICE PROCEDURE
Electronic Engine Control I
- Description
- Operation
- Electronic Control Assembly (ECA)
- ECA Power Relay
- Manifold Absolute Pressure (Map) Sensor
- Barometric Pressure (BP) Sensor
- Engine Coolant Temperature (ECT) Sensor
- Inlet Air Temperature (IAT) Sensor
- Crankshaft Position (Cp) Sensor
- Throttle Position Sensor (TPS)
- EGR Valve Position (EVP) Sensor
- DURA-Spark II Ignition System
- Air Pressure-Operated EGR System
- THERMACTOR Air Control
- Testing & Diagnosis
- Test Equipment
- Visual (Pre-Check) Inspection
- Test Equipment Hook-Up
- Engine Will Not Start
- Engine Starts
- Component Diagnosis
- Notes
- Reference Voltage (Vref) Not Within Limits
- Manifold Absolute Pressure (MAP) Sensor Not Within Limits
- Throttle Position Sensor (TPS) Not Within Limits
- Barometric Pressure (BP) Sensor Not Within Limits
- Engine Coolant Temperature (ECT) Sensor Not Within Limits
- Inlet Air Temperature (IAT) Not within Limits
- Thermactor Air By-Pass (TAB) Solenoid Not Within Limits
- EGR Valve Position (EVP) Sensor Not Within Limits
- EGR Solenoid Valve Check
- Spark Advance Not Within Limits
- Crank Signal Not Within Limits
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.