General Pinpoint Test 11: Fuel Injector Inspection

GENERAL PINPOINT TEST 11: FUEL INJECTOR INSPECTION

PINPOINT TEST 11		FUEL INJECTOR INSPECTION
STEP	INSPECTION		ACTION
1	LISTEN FOR INJECTOR OPERATION Warm up engine and run at idle (or cranking if engine will not start). Listen for "clicking" sound from the injectors (use stethoscope if necessary). Are all injectors "clicking"?	Yes	Go to step 3.
1		No	Go to next step.
2	CHECK INJECTOR RESISTANCE Disconnect suspect injector connectors. Measure resistance of injectors. Is resistance between 11-13 ohms for 2.3L, 11-18 ohms for 4.0L or 8.5-15.5 ohms for 3.0L?	Yes	Check injector driver circuits from PCM.
2		No	Replace injector(s). Go to next step.
3	CHECK INJECTORS FOR FUEL LEAKAGE WARNING: Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire. See FUEL PRESSURE RELIEF . Remove fuel rail assembly from intake manifold. See FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 2.3L REMOVAL / INSTALLATION FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 3.0L REMOVAL / INSTALLATION , or FUEL INJECTION SUPPLY MANIFOLD AND FUEL INJECTOR - 4.0L REMOVAL / INSTALLATION . Connect fuel lines. Key ON, Engine OFF (KOEO). Check for fuel leaks from injectors. Is fuel leakage less than 1 drop per 2 minutes?	Yes	Fuel injectors are not leaking.
3		No	Check for leaking O-rings and fuel rail damage. Repair or replace as necessary.