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 II (SBEC II) connector.
Single Board Engine Controller (SBEC):
2. Check that the battery cables are clean and tight.
Battery Cable Connections:
3. Check that all relay electrical connections are fully pushed onto their respective relays inside the Power Distribution Center, and that the battery connections are clean and tight.
Power Distribution Center:
4. Check that the electrical connections are properly connected to the ignition coil, and check that the secondary ignition cables are properly routed and connected to the distributor cap and respective spark plugs.
Ignition Coil:
Ignition System Electrical Connector:
5. Check that the sync signal generator electrical connector is connected to the harness connector.
6. Check that the alternator electrical connections are firmly connected to the alternator.
7. Check that the alternator ground wires are properly connected at the alternator and the engine block.
Alternator Electrical Connectors:
8. Check that the CCV fresh air hose is firmly attached to the valve cover and the air cleaner housing, and that there are no leaks.
CCV System:
9. Check that the fuel pump ballast bypass relay is fully pushed into its relay plug, and check that the fuel pump ballast resistor electrical connections are connected properly.
Ballast Bypass Relay:
10. Check that the fuel pressure regulator vacuum hose is firmly attached to the fuel pressure regulator and the intake manifold nipple. Check that there are no vacuum leaks in this circuit.
Pressure Regulator Vacuum Hose:
11. Check that the quick-connect fuel fittings at the fuel rail are fully connected and snapped onto the fuel rail.
Fuel Supply Tube:
12. Check that all the vacuum hoses are firmly connected to the intake manifold ports, and that there are no leaks.
13. Check that the throttle, accelerator, and cruise control cables, and their connections, are properly attached to the arm of the throttle body and that there is no binding or restriction of movement.
Cable Locations:
14. Check that the power brake vacuum hose is securely attached to the power brake booster and the vacuum port at the intake manifold, and that there are no leaks.
Brake Vacuum Booster Hose:
15. Check that there are no restriction in the air cleaner inlet, and that the air cleaner element is clean. Check that the radiator is free of debris and that the cooling fins are straight.
16. Check that the Manifold Air Temperature (MAT) sensor's 2-way electrical connector is fully pushed into the MAT sensor.
Manifold Air Temperature (MAT) Sensor:
17. Check that the engine ground strap is firmly attached at the firewall and the rear of the cylinder head.
Engine Ground Strap Connections:
18. Check that the Manifold Absolute Pressure (MAP) sensor's 3-way electrical connector is fully inserted into the MAP sensor. Check that the vacuum hose is securely attached to the MAP sensor and the intake manifold.
Manifold Absolute Pressure (MAP) Sensor:
19. Check that the injector wiring harness connectors are connected to the proper injectors. Each injector plug has a tag attached to it that corresponds to its proper injector.
Fuel Injector Wiring Harness:
20. Check that the 3-way Automatic Idle Speed (AIS) motor and 3-way Throttle Position Sensor (TPS) electrical connectors are fully inserted into their respective components.
AIS Motor And TPS:
21. Check that the coolant temperature sensor's 2-way electrical connection is securely attached and fully pressed on.
Coolant Temperature Sensor:
22. Check that the oxygen sensor's electrical connector is securely attached to the oxygen sensor.
Heated Oxygen Sensor Location:
23. Raise and support the vehicle, and check for pinched, leaking, or cracked fuel tubes or hoses.
24. Check for exhaust restrictions such as: pinched exhaust pipe, plugged catalytic converter, or plugged muffler.
25. If the vehicle is equipped with an automatic transmission, check that the neutral/safety switches electrical connector is fully pushed onto the switch.
26. Check that the vehicle distance (speed) sensor's 2-way electrical connector is fully inserted into the vehicle distance (speed) sensor.
Vehicle Distance (Speed) Sensor:
27. Check the electrical and fuel hose connections at the fuel pump. Verify that the electrical connector is fully pushed onto the fuel pump.