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 secondary ignition cable condition, connection, and routing.
2. Check the Direct Ignition System (DIS) coil electrical connections.
Ignition Coils Electrical Connection:
3. Check that the cam position sensor 3-way electrical connector is fully pushed into the main harness.
Cam Sensor Electrical Connection:
4. Check that the coolant temperature sensor 2-way electrical connector is fully pushed into the main harness.
5. Check that the engine temperature sensor electrical connector is fully pushed into the main wiring harness.
Coolant Temperature Sensor:
6. Check that the quick connect fuel fittings are fully inserted into the fuel return and supply tubes.
7. Check that the vacuum connections to the fuel pressure regulator are securely attached and not leaking.
Fuel Pressure Regulator Vacuum Connection:
8. Check that the oil pressure switch electrical connection is fully pressed into the main harness.
Oil Pressure Sending Unit Electrical Connection:
9. Check that the canister purge solenoid 2-way electrical connection and vacuum connections are properly attached to the canister purge solenoid.
Canister Purge Solenoid Electrical Connector:
10. Check that the vacuum hoses are firmly attached to the vapor canister, and that they aren't leaking.
Vapor Canister Hose Connections:
11. Check that the 2-way electric connector at each injector is fully pressed onto each injector.
12. Check that the fuel injector harness and engine wiring harness are fully inserted into the main wiring harness electrical connector.
Wiring Harness Electrical Connectors:
13. Check that the vacuum connections on the throttle body are securely attached and not leaking.
14. Check that each 3-way electrical connector for the Throttle Position Sensor (TPS) and the AIS motor are fully inserted into the main wiring harness.
15. Check that the Electric EGR Transducer (EET) 2-way electrical connector is fully pressed into the solenoid part of the EET.
16. Make sure that the vacuum hoses are securely attached and not leaking at the EET and the rest of the EGR system.
Throttle Body Electrical And Vacuum Connections:
17. Check that the electrical connections at the neutral/safety switch, transmission solenoid, output speed sensor, and the input (turbine) speed sensor are all connected securely.
Automatic Transmission Electrical Connections (4 Speed):
18. Check that the electrical connector for the charge temperature sensor is fully pressed into the sensor.
19. Check that the vacuum hoses are securely attached at the intake plenum and not leaking.
Charge Temperature Sensor:
20. Check the EGR tube connections at the exhaust manifold and the intake manifold.
21. Check that the PCV vacuum hoses are securely attached to the intake manifold and the valve cover.
PCV System:
22. Check that the following electrical connectors are fully pressed onto their respective components.
- Crankshaft position sensor 3-way connector
- Knock sensor connector
- Vehicle distance (speed) sensor 2-way connector
Crank Position And Knock Sensor Locations:
23. Check that the vacuum and electrical connections are fully pressed onto the MAP sensor, and that the vacuum hose on the intake plenum is securely attached.
24. Check that the engine ground strap is securely connected at the dash panel and the engine.
25. Check that the oxygen sensor's 4-way electrical connector is fully pressed into the harness connector.
26. Check that the alternator wiring connections are securely fastened to the alternator, and that the belt is at the proper tension.
MAP And Oxygen Sensor, And Ground Strap Locations:
27. Check that the 60-way Engine Controller Electrical Connector is fully pushed into the Single Board Engine Controller (SBEC).
Single Board Engine Controller (SBEC):
28. Check that all relay electrical connections are fully pushed onto their respective relays, and that the battery connections are clean and tight.
Relay Locations:
29. Check that the power brake vacuum lines are firmly attached and that there are no leaks.
Power Brake Booster Vacuum Hose:
30. Check that the speed control vacuum lines are firmly attached and that there are no leaks.
Speed Control Vacuum Hose:
31. Check the electrical and fuel hose connections at the fuel pump. Verify that the electrical connector is fully pushed onto the fuel pump.