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 the ignition coil electrical connections.

Ignition Coil Connections:

2. Check the canister purge solenoid vacuum and electrical connections.
3. Check the EGR solenoid vacuum and electrical connections.

Solenoid Pack:

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

Vapor Canister Hose Connections:

5. .Check the alternator wiring connections, belt condition, and belt tension.
6. Check the MAP sensor vacuum and electrical connections

MAP Sensor Vacuum And Electrical Connections:

7. Check that the throttle body to main harness connections are properly attached.

Throttle Body Electrical Connections:

8. Check the following electrical connectors for proper connection:
AIS motor 4-way connector
Throttle Position Sensor (TPS) 3-way connector
Throttle body temperature sensor 2-way connector
Fuel injector 2-way connector

Throttle Body Wiring Connections:

9. Check that the PCV vacuum hoses are securely attached to the intake manifold and the valve cover.

PCV Valve Vacuum Hoses:

10. 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:

11. Check the heated air inlet door vacuum line condition and connection.
12. Check that the hose is connected at the EGR back pressure transducer, and make sure that the hose is in good condition and not leaking.

EGR Control Valve and Back-Pressure Transducer:

13. 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:

14. Check secondary ignition cable condition, connection, and routing.

Ignition Cable Routing And Connection:

15. Check that the coolant temperature sensor's 2-way electrical connection is securely attached.
16. Check battery ground connection at left side cylinder head.

Coolant Temperature Sensor:

17. Check distributor's 3-way electrical connection.
18. Check that the radiator fan electrical connection is fully pressed on.
19. Check that the oil pressure switch electrical connection is fully pressed on.

Distributor, Oil Pressure Switch, And Radiator Cooling Fan Electrical Connections:

20. Check neutral safety switch for proper installation (Automatic Transmission only).

Neutral Safety Switch Electrical Connections:

21. 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):

22. Check that all relay electrical connections are fully pushed onto their respective relays, and that the battery connections are clean and tight.

Relay Location:

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

Engine Harness To Main Harness:

24. Check distance (speed) sensor's 2-way electrical connection for proper installation.

Distance Sensor Wiring Connection:

25. Check that the engine ground strap is attached securely at the intake manifold and the dash panel.

Engine Ground Strap At Intake Manifold:

Engine Ground Strap To Dash Panel:

26. Check that the oxygen sensor's 4-way electrical connector is fully pressed into the harness connector.