Engine Difficult to Start or No Start

1. Access diagnosis codes. If abnormal codes are present, proceed to ``Diagnosis Code Interpretation.'' If a normal code is present, proceed to step 2.
2. On models with 5M-GE, 7M-GE and 7M-GTE engines, check if engine starts with accelerator pedal depressed. If engine does not start, proceed to step 3. If engine starts, check idle speed control system for proper operation.
3. On all models, check for vacuum leaks in air intake line. If no vacuum leaks are present, proceed to step 4. If vacuum leaks are present, check the following:
a. Hose connections.
b. PCV hoses.
c. Ensure EGR valve stays open.
d. Oil filler cap and oil level gauge.
4. Check for spark at end of spark plug wire while cranking engine. If spark is present, proceed to step 5. If no spark is present, check the following:
a. Plug wires.
b. High tension wires.
c. Distributor.
d. Ignition coil igniter.
e. ECU on models with 22R-E and 22R-TE engines. Disconnect electrical connectors at fuel injectors and start injector time switch before cranking engine.
5. Check ignition timing. If timing is satisfactory, proceed to step 6. If timing is not satisfactory, adjust as required.
6. Check fuel supply to injector. Ensure fuel in tank and fuel pressure are satisfactory. If fuel supply to injector is satisfactory, proceed to step 7. If fuel supply to injector is not satisfactory, check the following:
a. Leaking or defective fuel line.
b. Fuse or open circuit in relay.
c. Fuel pump, fuel filter and pressure regulator.
7. Check fuel pump switch in air flow meter for proper operation. If switch is satisfactory, proceed to step 8. If switch is not satisfactory, replace air flow meter.
8. Ensure spark plugs are satisfactory. If plugs are satisfactory, proceed to step 9. If plugs are not wet and gaps are as specified, check compression pressure and valve clearance. If all plugs are wet, check for the following:
a. Shorted or leaking injectors.
b. Shorted injector wiring between resistor and ECU.
c. Leaking cold start injector.
d. Defective start injector time switch.
9. Check air valve for proper operation, if equipped. If valve is satisfactory, proceed to step 10. If valve is not satisfactory, replace air valve, water hoses and air hoses as required.
10. Ensure EFI electronic circuit is satisfactory. If circuit is satisfactory, test is complete. If circuit is not satisfactory, check the following:
a. Fusible link, fuse or EFI main relay.
b. Air flow meter.
c. Water thermo sensor.
d. Injection signal circuit.
e. Air temperature sensor (if equipped).