Visual Inspection

A visual inspection for loose, disconnected, damaged, or misrouted wires and/or hoses should be made prior to diagnosing or servicing the fuel injection system. A thorough visual inspection will help find these faults and save unnecessary testing and diagnostic time.

VISUAL INSPECTION

1. Check that the 60-way engine controller electrical connector is fully pushed into the Single Board Engine Controller (SBEC) connector.

Single Board Engine Controller (SBEC):

2. Check that the vacuum hoses are firmly attached to the vapor canister, and that they aren't leaking.

Charcoal Canister Location:

3. Check the alternator wiring connections, belt condition, and belt tension.
4. Check that the engine ground strap is attached at the engine and the firewall.

Engine Ground Strap To Engine:

5. Check that the electrical connections are properly connected to the ignition coil.

Ignition Coil Connections:

6. Check that the 3-way distributor electrical connector is securely attached to the distributor harness.
7. Check that the oil pressure switch 2-way electrical connector is securely attached to the oil pressure sending unit.

Distributor And Oil Pressure Switch Electrical Connections:

8. Check that the oxygen sensors 4-way electrical connector is securely attached to the oxygen sensor.

Heated Oxygen Sensor Connection:

9. Check that the air switching solenoids 2-way electrical connector and vacuum connector are securely attached to the air switching solenoid.
10. Check that the EGR solenoids 2-way electrical connector and vacuum connector are securely attached to the EGR solenoid.
11. Check that the canister purge solenoids 2-way electrical connector and vacuum connector are securely attached to the canister purge solenoid.

Solenoid Trio:

12. Check that the engine harness to main wiring harness electrical connections are fully pressed into each other.

Engine Harness To Main Harness:

13. Check that the throttle body temperature sensors 2-way electrical connector is securely attached to the throttle body temperature sensor.

Throttle Body Temperature Sensor:

14. Check the throttle position sensors 3-way electrical connector is completely pushed into the throttle position sensor.
15. Check the MAP sensors 3-way electrical connector and vacuum connection are completely pushed into the MAP sensor.

TPS Sensor Electrical Connector:

16. Check that the Idle Speed Control (ISC) actuator 4-way electrical connector is securely attached to the ISC actuator.
17. Check that the fuel injector wiring harness 4-way electrical connector is pushed all the way into the main harness electrical connector.

Throttle Body Wiring Connections:

18. Check the throttle body vacuum hose connections at the front and rear of the throttle body and ensure that there are no leaks.

Throttle Body Vacuum Ports--Front:

Throttle Body Vacuum Ports--Rear:

19. Check that the vacuum connection to the air cleaner heated inlet diaphragm is securely attached and not leaking.
20. Check that the PCV vacuum hoses are securely attached to the intake manifold vacuum port and the valve cover.

Throttle Body Vacuum Ports--Rear:

21. Check that the power brake vacuum hose is securely attached to its vacuum port and that it is not leaking.
22. Check that the vacuum hose is connected at the EGR back pressure transducer, and make sure that the hose is in good condition and not leaking.

EGR Mounting:

23. Check that the coolant temperature sensor's 2-way electrical connection is securely attached and fully pressed on.

Coolant Temperature Sensor:

24. Check that the power brake and speed control vacuum lines are firmly attached and that there are no leaks.

Power Brake And Speed Control Vacuum Connections:

25. Check secondary ignition cable condition, connection, and routing.
26. Check that all relay electrical connections are fully pushed onto their respective relays, and that the battery connections are clean and tight.

Relay Locations:

27. Check distance (speed) sensor's 2-way electrical connection for proper installation.
28. Check neutral/safety switch for proper installation (Automatic Transmission only).
29. Check the torque converter lockup Solenoid electrical connection (Automatic Transmission).
30. Check that the overdrive solenoid electrical connection is completely pushed into the solenoid (Automatic Transmission).

Transmission Electrical Connections (4 Speed Overdrive):

Transmission Electrical Connections:

31. Check the electrical and fuel hose connections at the fuel pump. Verify that the electrical connector is fully pushed onto the fuel pump.