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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 1.9LFUEL CONTROL SYSTEM TESTINGINJECTOR CIRCUIT
1991 Mercury Tracer Base, 4D Sedan, Automatic
Injector Circuit
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Injector Circuit
- Disconnect all injector harness connectors. Using digital ohmmeter, check resistance across terminals of each injector. See appropriate injector resistance table.
- On models without Sequential Electronic Fuel Injection (SEFI), disconnect injector bank harness connector, check resistance of injector bank. See INJECTOR BANK RESISTANCE table. Injectors on SEFI models have each individual injector wired to the ECA. Repair wiring or replace any injector circuit not within specification.
INDIVIDUAL INJECTOR RESISTANCE
| Engine | Ohms | ||
|---|---|---|---|
| All Models | (1) 13.0-16.0 | ||
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RENDER: 1.0x
NO RELATED
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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.