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Air Charge Temperature Sensors (ACT)

Manifold Air Temperature Sensors (MAT)

Intake Air Temperature Sensors (IAT)

Description: Measures air temperature through changing resistance and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered.

Symptoms of Failure: Recommended Service: Should be performed every 25,000 to 35,000 miles and consists of cleaning or replacing sensors that are non-functional.

Air Charge Temperature Sensors
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Camshaft Position Sensors (CMP)

Crankshaft Position Sensors (CKP)

Description: Determines camshaft and crankshaft position and sends this information to the onboard computer. The computer uses this and other inputs to calculate injector on time and ignition system timing.

Symptoms of Failure: Recommended Service: There is no scheduled service. Part must be replaced when failure occurs.

Camshaft and Crankshaft Position Sensors
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Engine Coolant Temperature Sensors (ECT)

Description: Measures coolant temperature through changing resistance and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered.

Symptoms of Failure: Recommended Service: Should be performed every 25,000 to 35,000 miles and consists of cleaning or replacing sensors that are non-functional.

Engine Coolant Temperature Sensors
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Exhaust Gas Recirculation (EGR) Valves

Description: Meters exhaust gas into the intake manifold. This exhaust gas reduces combustion chamber temperatures and as a result it reduces NOX emissions.

Symptoms of Failure: Recommended Service: Remove and clean with each tune-up. Replace when valve sticks or diaphragm ruptures.

Exhaust Gas Recirculation Valves
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Sonic Exhaust Gas Recirculation (EGR) Valve Position Sensors (EVP)

Description: Monitors EGR (exhaust gas return) valve position by sending varying voltages to the onboard computer. The onboard computer uses this input and information from the other sensors to determine the correct amount of exhaust gas to properly control emissions.

Symptoms of Failure: Recommended Service: Check for proper operation with each tune-up. Replace when trouble codes indicate failure.

Sonic Exhaust Gas Recirculation Valve Position Sensors
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Exhaust Gas Recirculation Valve Pressure Sensors (EVPS)

Description: Monitors exhaust system pressure by sending varying voltages to the onboard computer. The onboard computer uses this input and information from the other sensors to determine the correct amount of exhaust gas to properly control emissions.

Symptoms of Failure: Recommended Service: Check for proper operation with each tune-up. Replace when trouble codes indicate failure.

Exhaust Gas Recirculation Valve Pressure Sensors
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Fuel Injection Repair Kits

Repair Kits Include: All components needed when replacing or servicing injectors.

Symptoms of Failure: Fuel Injection Repair Kits
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Fuel Pressure Regulators (FPR)

Description: Maintains correct pressure in the fuel rail for proper injector fuel delivery.

Symptoms of Failure: Recommended Service: There is no scheduled service for fuel pressure regulators. Regulators are non-serviceable. Replace when failure occurs.

Fuel Pressure Regulators
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Idle Air Control Motors (IAC)

Description: A stepper motor controlled by the onboard computer. The computer moves the pintle in and out of an opening that bypasses the throttle blade. This allows the computer to precisely control idle speed when varying loads are placed on the engine.

Symptoms of Failure: Recommended Service: Check for proper operation with each tune-up. Replace when trouble codes indicate failure.

Idle Air Control Motors
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Idle Speed Control Motors (ISC)

Description: A DC motor controlled by the onboard computer. The computer moves the pintle in and out to position the throttle for varying engine loads thereby maintaining correct idle speed.

Symptoms of Failure: Recommended Service: Check for proper operation with each tune-up. Replace when trouble codes indicate failure or motor is no longer operational.

Idle Speed Control Motors
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Knock Sensors (KS)

Description: Detects engine block vibrations caused from engine knock and sends a signal to the computer to retard ignition timing.

Symptoms of Failure: Recommended Service: Check connection and signal from sensor or when engine knock or pinging develops.

Knock Sensors
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Manifold Absolute Pressure Sensors (MAP)

Manifold Differential Pressure Sensors (MDP)

Barometric Pressure Sensors (BPS)

Description: MAP measures manifold pressures and BPS measures barometric pressure through changing voltage and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered.

Symptoms of Failure: Recommended Service: Sensors are non-serviceable. Replace sensors that are non-functional.

Manifold Absolute Pressure Sensors
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Mass Air Flow Sensors (MAF)
Hot Film or Hot Wire Anemometer

Description: MAF measures the amount of air by weight through changing voltages or frequencies and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered.

Symptoms of Failure: Recommended Service: Sensors are non-serviceable. Replace sensors that are non-functional.

Mass Air Flow Sensors
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Port Fuel Injectors (PFI) and Fuel Injector Seal Kits

Description: Controlled by the onboard computer to meter and atomize the correct amount of fuel entering each cylinder under all operating conditions.

Symptoms of Failure: Recommended Service: Should be performed every 25,000 to 35,000 miles and consists of cleaning or replacing with Walker Foul-Resistant Injectors.

Seal Kits Include: All o-rings and miscellaneous parts needed when servicing fuel injectors or other components.

Port Fuel Injectors
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Temperature Indicator Switch (TIS)

Description: Controls the temperature light or gauge on the dashboard.

Symptoms of Failure: Recommended Service: Check electrical connections, replace switch if faulty.

Temperature Indicator Switch
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Throttle Air Bypass Valves (TABPV)

Description: A solenoid controlled by the onboard computer. The computer moves the pintle in and out of an opening that bypasses the throttle blade. This allows the computer to precisely control idle speed when varying loads are placed on the engine.

Symptoms of Failure: Recommended Service: Service should be performed every 25,000 to 35,000 miles and consists of cleaning or replacing valves that are non-functional.

Throttle Air Bypass Valves
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Throttle Body Fuel Injectors (TBI)

Description: TBI are controlled by the onboard computer to meter and atomize the correct amount of fuel entering the intake manifold under all operating conditions.

Symptoms of Failure: Recommended Service: Should be performed every 25,000 to 35,000 miles and consists of cleaning or replacing with Walker Foul-Resistant Injectors.

Throttle Body Fuel Injectors
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Throttle Position Sensors (TPS)

Description: Measures throttle position through changing voltage and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered.

Symptoms of Failure: Recommended Service: There is no scheduled service for TPS sensors. Sensors are non-serviceable. Replace when failure occurs.

Throttle Position Sensors
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Vehicle Speed Sensor (VSS)

Description: Sends electrical pulses to the computer, pulses which are generated through a magnet that spins a sensor coil. When the vehicle's speed increases, the frequency of the pulse also increases.

Symptoms of Failure: Recommended Service: Check connections for proper output signal.

Vehicle Speed Sensor
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