Visual Inspection

In order that the ignition and fuel systems function properly, all electrical, vacuum or air hose connection must be complete and tight.
Terminals in electrical connections must lock together. Look for connectors that are not fully plugged into each other or terminals that are not fully plugged into the insulator.
All hoses must be fully and firmly fitted at their connections. Look for hoses that are not fully plugged on or are pinched and cut.

The following must be checked before proceeding with the diagnostic procedure.

1. IGNITION SYSTEM COMPONENTS
A. Connectors at Computer.
B. Pickup coil connectors at distributor.
C. Spark plug wires.
D. Coil wire (cap and coil connections).
E. Connectors at coil.
F. Connectors at starter relay.
G. Connector at detonation sensor.
H. Computer ground wire.

2. FUEL CONTROL SYSTEM
A. Connector at engine temperature sensor or temperature switch.
B. Connector at oil pressure switch.
C. Connector and choke control.
D. Connectors at carburetor harness.
E. Carburetor ground switch.
F. Connectors at air switching and EGR solenoids.
G. Engine harness to main harness connector.
H. Battery cables.
I. Battery ground on engine.
J. Engine to firewall ground strap.
K. Oxygen sensor connector.

3. CARBURETOR 1-BBl
A. Choke diaphragm/heated air door vacuum line.
B. Choke diaphragm vacuum line at choke.
C. Choke vacuum line at vacuum tee in choke vacuum kick diaphragm vacuum line.
D. CVSCC vacuum line.
E. EGR amplifier vacuum line. (Federal)
F. Power valve vacuum line. (California/high altitude)
G. Bowl vent hose.
H. EGR signal vacuum line.
I. PCV valve hose.
J. Canister purge hose.
K. Computer vacuum line.

4. CARBURETOR 2-BBl
A. Choke diaphragm/heated air door vacuum line.
B. Choke diaphragm vacuum line at choke.
C. Choke vacuum line at vacuum tee in choke vacuum kick diaphragm vacuum line.
D. CVSCC vacuum line.(Federal)
E. EGR amplifier vacuum line. (Federal)
F. CVSCC/computer vacuum line. (California/high altitude)
G. Bowl vent hose.
H. EGR signal vacuum line.
I. PCV valve hose.
J. Canister purge hose.
K. Computer vacuum line. (Federal)
L. Power brake booster hose.

5. EGR SYSTEM 1-BBl
A. EGR valve vacuum line connector.
B. EGR control solenoid vacuum line connector.
C. EGR amplifier vacuum lines.

6. EGR SYSTEM 2-BBl
A. EGR valve vacuum line connector.
B. EGR vacuum delay valve vacuum lines.
C. CVSCC vacuum line connector. (Federal)
D. EGR solenoid vacuum lines. (California/High Altitude)
E. EGR amplifier vacuum lines. (California/High Altitude)

7. HEATED AIR INTAKE SYSTEM 1-BBl
A. Heated air door vacuum diaphragm hose.
B. Heated air delay valve hoses.
C. Heated air temperature sensor hoses.
D. Hose at vacuum tee in choke vacuum kick diaphragm vacuum line.

8. HEATED AIR INTAKE SYSTEM 2-BBl
A. Heated air door vacuum diaphragm hose.
B. Heated air temperature sensor hoses.
C. Hose at vacuum tee in choke vacuum kick diaphragm vacuum line.

9. EVAPORATIVE CONTROL SYSTEM 1-BBl
A. Bowl vent hose at canister.
B. CVSCC hose at canister.
C. Purge hose at canister.
D. Fuel tank vapor hose at canister.
E. Purge hose between canisters. (California)
F. CVSCC valve vacuum line connector.

10. EVAPORATIVE CONTROL SYSTEM 2-BBl
A. Bowl vent hose at canister.
B. CVSCC hose at canister. (California/High Altitude)
C. Purge hose at canister.
D. Vacuum hoses at purge solenoid. (Federal)
E. Purge hose between canisters. (California)
F. CVSCC vacuum hose connector. (California/High Altitude)
G. Fuel tank vapor hose at canister.

11. AIR SWITCHING SYSTEM 1-BBl
A. Air switching/relief valve vacuum hose.
B. Upstream and downstream hoses at air switching/relief valve.
C. Vacuum lines at air switching solenoid.
D. Vacuum lines at tee in EGR amplifier/air switching line from intake manifold vacuum source.

12. AIR SWITCHING SYSTEM 2-BBl
A. Air switching/relief valve vacuum hose.
B. Upstream and downstream hoses at air switching/relief valve.
C. Vacuum lines at air switching/relief valve/power heat valve vacuum line tee. (Federal)
D. Vacuum lines at air switching/relief valve/power heat valve solenoid.
E. Power heat valve vacuum line. (Federal)

13. MISCELLANEOUS
A. Correct PCV valve.
B. PCV system breather hose.
C. Power brake booster hose. (Checkhose connections at filter if so equipped)
D. Intake manifold vacuum supply nipple and attached hoses.
E. Speed control servo.
F. Computer vacuum hose.