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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (3.8L))IGNITION SYSTEMDI SYSTEMTEST EQUIPMENT
1991 Mercury Tracer Base, 4D Sedan, Automatic
Test Equipment
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Test Equipment
WARNING: This page is about a different car, the 1994 Mercury Sable, 1994 Mercury Cougar, 1994 Lincoln Continental, 1994 Ford Thunderbird, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
Following test equipment should be used in DI system tests.
- Spark Tester (D81P-6666-A Or D89P-6666-A)
- Digital Volt-Ohmmeter (DVOM)
- 12-Volt Test Light
- Remote Starter Switch
- EEC-IV Diagnostic Cable (007-00097)
- EEC-IV Breakout Box (T83L-50-EEC-IV)
- Inductive Timing Light
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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.