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                Engine Coolant Temperature Sensors                                                                                                                                        Air Charge Temperature Sensors                                                                                                                                            Ported Vacuum Switches                                                                                                                                                     Map Sensors

                 What They Do: Measure coolant temperature                                                                                                                                 What They Do: Measure air temperature in the                                                                                                                              What They Do: Act as a thermostatic switch,                                                                                                                               What They Do: Signal computer to adjust timing

                 and signal computer to adjust air/fuel mixture.                                                                                                                           intake manifold and signal computer to adjust                                                                                                                             controlling EGR Valve, heat riser, vacuum                                                                                                                                 and air/fuel ratio based on the amount of pressure

                                                                                                                                                                                           air/fuel mixture.                                                                                                                                                         advance and other vacuum controlled devices.                                                                                                                              in the intake manifold.

                 Failure Symptoms: Poor performance and

                 economy and hard starting.  Watch for service                                                                                                                             Failure Symptoms: ‘Check Engine’ light is on                                                                                                                              Failure Symptoms: Poor performance and                                                                                                                                    Failure Symptoms: Poor performance and

                 light or ‘Check Engine’ light.                                                                                                                                            continuously, hesitation, poor mileage or strong                                                                                                                          economy.  Surging, chugging and engine knock.                                                                                                                             economy.  Black smoke, stalling, surging and

                                                                                                                                                                                           exhaust odour.                                                                                                                                                                                                                                                                                                                                      catalytic converter overheating can occur.

                 Maintenance/Service: Inspect every 12,000 to                                                                                                                                                                                                                                                                                                        Maintenance/Service: Inspect for damage

                 15,000 miles.  Old coolant or improper coolant                                                                                                                            Maintenance/Service: Inspect for damage or                                                                                                                                every 6,000 to 8,000 miles.  Check for cracked                                                                                                                            Maintenance/Service: Inspect during tune-up.

                 level may make the sensor inoperable or give                                                                                                                              contamination when trouble codes indicate                                                                                                                                 or broken nozzles.  Function test if engine                                                                                                                               Look for misrouted, collapsed, cracked or clogged

                 false readings.                                                                                                                                                           problem in the circuit.                                                                                                                                                   overheats.                                                                                                                                                                vacuum lines.  Check terminals or broken wires.

                Choke Pull-Offs                                                                                                                                                           Idle Speed Controls                                                                                                                                                        Fuel Pressure Regulators                                                                                                                                                  Fuel Injectors

                 What They Do: Slightly open choke plate                                                                                                                                   What They Do: Move throttle linkage to maintain                                                                                                                           What They Do: Maintain proper fuel pressure.                                                                                                                              What They Do: Meter and atomize pressurized

                 to allow air to enter carburettor on cold start-up.                                                                                                                       idle speed under various load conditions.                                                                                                                                                                                                                                                                                                           fuel delivered to the engine.

                                                                                                                                                                                                                                                                                                                                                                     Failure Symptoms: Excessive cranking on

                 Failure Symptoms: Hard starting, rich fuel                                                                                                                                Failure Symptoms: Engine stalling.                                                                                                                                        start up.  Hesitation on acceleration.                                                                                                                                    Failure Symptoms: Hard starting, poor

                 mixture, rough cold-running engine.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           performance and economy.

                                                                                                                                                                                           Maintenance/Service: Inspect for corrosion                                                                                                                                Maintenance/Service: Check rail pressure at

                 Maintenance/Service: Inspect on engine                                                                                                                                    on terminals, check for proper operation and                                                                                                                              each tune-up.  Replace if pressure is low.                                                                                                                                Maintenance/Service: Inspect every 25,000

                 tune-up. Check when cold-running problems                                                                                                                                 adjust with each tune-up.                                                                                                                                                                                                                                                                                                                           miles or when engine driveability problems occur.

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