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 MANUALSFORD1991CLUB WAGON E250, 7.3 MREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEMFUEL CONTROLINJECTOR CIRCUIT
1991 Ford Club Wagon E250, 7.3 M
Injector Circuit
1991 Ford Club Wagon E250, 7.3 MSECTION Injector Circuit
- Disconnect all injector harness connectors. Using digital ohmmeter, check resistance across terminals of each injector. See appropriate INJECTOR RESISTANCE table.
- Disconnect injector bank harness connector, and check resistance of injector bank. See INJECTOR BANK RESISTANCE . Repair wiring or replace any injector circuit not within specification.
INDIVIDUAL INJECTOR RESISTANCE
| Engine | Ohms |
|---|---|
| 2.3L & 3.0L | 15.0-18.0 |
| All Others | 13.0-16.0 |
INJECTOR BANK RESISTANCE
| Engine | Ohms |
|---|---|
| 2.3L | 7.0-9.5 |
| 2.9L, 3.0L & 4.9L | 5.0-6.5 |
| 5.0L, 5.8L & 7.5L | 3.0-4.0 |
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.