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.
Fuel Injectors
- Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, measure resistance between fuel injector electrical terminals. Replace fuel injector if resistance is not within specification. See FUEL INJECTOR RESISTANCE SPECIFICATIONS table.
- To check fuel injector spray pattern and volume, remove fuel injector. See REMOVE/INSTALL/OVERHAUL article. Disconnect fuel hose from fuel filter outlet. Use Delivery Hose (09268-41045) to install fuel injector between fuel filter and fuel pressure regulator. See Fig 1 and Fig 2.
- Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage. Install Jumper Wire (SST 09843-18020) between +B and FP terminals of data link connector No. 1. Turn ignition on, with engine off to pressurize fuel system.NOTE: For proper location of data link connector No. 1 and terminal identification, see articles listed below:
Jumper wire is installed in data link connector No.
1 when checking fuel pump operation and fuel pressure.
- Connect fuel injector tester to fuel injector for 15 seconds. Use Fuel Injector Tester (09842-30070).
- Measure fuel injector volume and check spray pattern. Test each fuel injector 2-3 times. Replace fuel injector if volume is not as specified. See FUEL INJECTOR VOLUME SPECIFICATIONS table.NOTE: Ensure difference between fuel injector volume on all fuel injectors is within specification. See FUEL INJECTOR VOLUME SPECIFICATIONS table.
- Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector is one drop or less in specified time. See FUEL INJECTOR LEAKAGE SPECIFICATIONS table. Replace fuel injector if leakage exceeds specified amount. Turn ignition off and remove test equipment.
| Application | Ohms @ 68°F (20°C) |
|---|---|
| 2.7L | 12.0-16.0 |
| 3.0L | 13.4-14.2 |
| Application | Cu. In. (cc) |
|---|---|
| 2.7L | 4.0-5.0 (66-82) |
| 3.0L | 2.7-3.4 (45-55) |
| Maximum Difference Between Each Fuel Injector | .4 (6) |
| Application | Leakage Time |
|---|---|
| T100 | 1 Minute |
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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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