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                Mixture Control Solenoids                                                                                                                                                 Throttle Position Sensors                                                                                                                                                  Platinum II Oxygen Sensors                                                                                                                                                Idle Air Controls

                 What They Do: Adjust fuel mixture in computer                                                                                                                             What They Do: Monitor the throttle opening for                                                                                                                            What They Do: Measure the amount of oxygen in                                                                                                                             What They Do: Adjust air flow in the idle

                 controlled carburettors based on a signal from                                                                                                                            the computer to adjust fuel flow, engine timing                                                                                                                           exhaust and signal computer to adjust air/fuel ratio.                                                                                                                     circuit to maintain idle speed under various

                 oxygen sensor.                                                                                                                                                            and trans converter lock-up.                                                                                                                                                                                                                                                                                                                        load conditions.

                                                                                                                                                                                                                                                                                                                                                                     Failure Symptoms: Low voltage output or slow
                 Failure Symptoms: Rough idle, surging, poor                                                                                                                               Failure Symptoms: Hesitations, tip in surge,                                                                                                                              reaction causes poor performance and economy,                                                                                                                             Failure Symptoms: Vehicle stalling, high or low

                 fuel economy, high hydrocarbon emissions.                                                                                                                                 engine pinging, no torque converter lock-up.                                                                                                                              high hydrocarbon emissions.                                                                                                                                               idle speed.  'Check Engine' light on continuously.

                                                                                                                                                                                           'Check Engine' light on.

                 Maintenance/Service: Perform periodic emiss-                                                                                                                                                                                                                                                                                                        Maintenance/Service: Perform periodic emiss-                                                                                                                              Maintenance/Service: Check for carbon build-

                 ions checks. Replace according to manufacturer's                                                                                                                          Maintenance/Service: Inspect for proper                                                                                                                                   ions checks.  Replace according to manufacturer's                                                                                                                         up on pintle and clean passages every 25,000

                 specifications or every 25,000 miles. Watch for                                                                                                                           operation and adjust voltages when necessary.                                                                                                                             specifications or every 25 - 30,000 miles.  Watch for                                                                                                                     miles.  Replace according to manufacturer's

                 service light or 'Check Engine' light.                                                                                                                                    Check for corrosion on connectors.                                                                                                                                        service light or 'Check Engine' light.                                                                                                                                    specifications.

                Cam/Crank Position Sensors                                                                                                                                                Mass Air Flow Sensors                                                                                                                                                      Sky-Guard   EGR Valves                                                                                                                                                    Oxygen Sensor Tester

                 What They Do: Indicate position of cam (crank)                                                                                                                            What They Do: Measure weight of the air                                                                                                                                   What They Do: Recirculate a metered amount of                                                                                                                             What They Do: The Tomco oxygen sensor easily

                 to computer.                                                                                                                                                              entering the engine in grammes per second.                                                                                                                                exhaust gas into the intake manifold to cool com-                                                                                                                         tests the voltage output from the oxygen sensor.

                                                                                                                                                                                                                                                                                                                                                                     bustion temperatures and reduce NOX emissions.

                 Failure Symptoms: No start, extended cranking,                                                                                                                            Failure Symptoms: Hard starting, hesitation,                                                                                                                                                                                                                                                                                                        An LED lights when the sensor produces a high

                 backfire on start up.                                                                                                                                                     stalling, surging, black smoke, catalytic converter                                                                                                                       Failure Symptoms: Rough idle, pinging,                                                                                                                                    voltage and goes off when the sensor falls below

                                                                                                                                                                                           overheating, poor performance and economy.                                                                                                                                overheating, loss of power, stalling, surging,                                                                                                                            a low voltage.

                 Maintenance/Service: Check trouble codes and                                                                                                                                                                                                                                                                                                        severe engine damage caused by detonation.

                 diagnose as necessary.                                                                                                                                                    Maintenance/Service: Check for trouble codes.                                                                                                                                                                                                                                                                                                       This tester makes testing an oxygen sensor simple.

                                                                                                                                                                                           Rap sensor sharply.  Replace the sensor if engine                                                                                                                         Maintenance/Service: Inspect every 12,000 to

                                                                                                                                                                                           stumbles when rapping sensor.                                                                                                                                             15,000 miles and during engine tune-up.
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