Visual Inspection

In order that the ignition and fuel systems function properly, all electrical, vacuum, or air hose connections must be complete and tight. Before proceeding with the test procedure, the following must be checked.

ELECTRICAL CONNECTIONS

Terminal in connector must lock together. Look for connectors that are not fully plugged into each other or terminals that are not fully plugged into the insulator.

1. Ignition System Components

a. Connectors at computer.

b. Pickup coil connector at distributor.

c. Spark plug wires.

d. Coil wire (cap and coil connections).

e. Connectors at coil.

f. Starter relay.

2. Fuel Control System

a. Connector at solenoid kicker vacuum solenoid (where applicable).

b. Connector at coolant sensor.

c. Connector at oil pressure switch.

d. Connector at choke.

e. Connector at carburetor 6-way connector.

f. Carburetor ground switch.

g. Engine harness to main harness connector.

h. Battery cables.

i. Battery ground on engine.

j. Engine to firewall ground strap.

k. O2 sensor connector.

l. O2 sensor test connector.

m. Computer ground at left fender shield.
HOSE CONNECTIONS

All hoses must be fully and firmly fitted at their connections. Also, they cannot be pinched anywhere along their routing. Look for hoses that are not fully plugged in, or are pinched and cut.

1. PCV System

a. Hose between intake manifold and PCV valve.

b. Hose between breather module and air cleaner.

c. PCV valve plugged in.

d. Correct PCV valve. Black in color.

2. Computer

a. Hose between vacuum transducer and carburetor.

b. Air intake hose.

3. EGR System

a. Hose between carburetor and EGR CVSCC valve.

b. Hose between EGR CVSCC valve and EGR valve.

4. Air Switching System

a. Hose between carburetor and CVSCO valve.

b. Hose between CVSCO valve and air switching/ relief valve.

c. Hose between air pump and air switching/relief valve.

d. Hose between air switching/relief valve and exhaust manifold.

e. Hose between air switching/relief valve and plumbing to catalyst.

5. Evaporative Control System.

a. Hose between carburetor and external bowl vent valve.
b. Hose between external bowl vent valve and canister.

c. Hose between external bowl vent valve and air switching/relief valve.

d. Hose between canister and fuel tank line.

e. Hose between canister and plastic tee of EGR signal hose.

6. Choke System

a. Hose between carburetor and plastic connector.

b. Hoses between three-way connector and:

(1) choke pull off diaphragm - this hose may have a vacuum delay valve in it

(2) heater air door sensor

c. Hose between carburetor and fast idle speed reduction flow control valve.

d. Hose between fast idle speed reduction flow control valve and intake manifold.

7. Heated Air Door System

a. Hose between air sensor and delay valve.

b. Hose between delay valve and door diaphragm.

NOTE: Delay valve and door diaphragm are located inside air cleaner.

c. Hose between air cleaner and exhaust manifold heat stove.
8. Power Brakes and/or Speed Control (Where Applicable)

a. Hose between manifold and power brake booster.

b. Hose between power brake booster and speed control servo or intake manifold and speed control servo.

9. Heater/AC System

a. Vacuum hose at water valve.

b. Vacuum supply hose to instrument panel control.

10. Altitude Compensator (if so Equipped)

a. Hoses between carburetor and altitude compensator.

b. Hose between altitude compensator and filter.

11. Idle Control System (Vehicles Equipped with Solenoid Kicker)

a. Vacuum hose between carburetor and vacuum control solenoid.

b. Vacuum hose between vacuum control solenoid and solenoid kicker diaphragm.

12. Carburetor (Vacuum Operated Secondary - V.O.S.)

a. Vacuum hose between vacuum diaphragm and control solenoid.