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.
PFI Injector Circuit
Disconnect all injector harness connectors. Using digital ohmmeter, check resistance across terminals of each injector. See INDIVIDUAL PFI INJECTOR RESISTANCE table. Disconnect injector bank harness connector and check resistance of injector bank. See PFI INJECTOR BANK RESISTANCE table. Repair wiring or any injector not within specification.
| Engine | Ohms | |
|---|---|---|
| 1.9L | 2.0-2.7 | |
| 2.2L | ||
| Non-Turbo | 12-16 | |
| Turbo | 11-15 | |
| 2.3L OHC | 15.0-19.0 | |
| 2.3L HSC | 13.5-16.0 | |
| 2.3L HSO | 13.5-16.0 | |
| 3.0L | 15.0-18.0 | |
| 3.0L SHO | 13.5-16.0 | |
| 3.8L PFI | 13.5-16.0 | |
| 5.0L | ||
| Mustang | 1.5-19 | |
| All Other Models | 13.5-19 | |
| Engine | Ohms | ||
|---|---|---|---|
| 1.9L PFI | 1.2-1.8 | ||
| 2.2L & 2.2L Turbo | (1) | ||
| 2.3L OHC | 7.0-9.5 | ||
| 2.3L HSC | 7.0-9.5 | ||
| 2.3L HSO | 7.0-9.5 | ||
| 3.0L | 5.0-6.5 | ||
| 3.0L SHO | (1) | ||
| 5.0L | (1) | ||
|
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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.
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