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 57 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC (1.8L))FUEL SYSTEMFUEL SYSTEM TESTINGFUEL INJECTOR TEST
1991 Mercury Tracer Base, 4D Sedan, Automatic
Fuel Injector Test
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Fuel Injector Test
WARNING: This page is about a different car, the 1994 Mercury Tracer and 1994 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
- With engine idling or cranking (no start), use stethoscope to listen for consistent, operational sounds (clicking) coming from each injector. If operational sounds are present, go to FUEL INJECTOR LEAKAGE TEST. If operational sounds are not present, go to next step.
- Disconnect fuel injector connector and install continuity checker into injector connector. Start or crank engine. Observe whether continuity checker blinks, indicating completed circuit for injector being tested. Repeat continuity check for each injector. If all injector circuits indicate continuity, go to next step. If any circuit does not indicate continuity, turn ignition on. Check for 12 volts at each injector connector. If 12 volts is present at each injector connector, go to next step. If 12 volts is not present at each connector, repair wiring as necessary.
- Using DVOM, check injector resistance. Replace injector if resistance is not about 12-16 ohms at 68°F (20°C). Repeat step 1). If results of step 1) are okay, go to FUEL INJECTOR LEAKAGE TEST. If injector resistance is within specification, go to FUEL INJECTOR LEAKAGE TEST.
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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.