1968 Shelby GT500

EGR Valve Position sensor (EVP)

EVR Valve Position Sensor
The EGR Valve Position (EVP) sensor monitors the position of the EGR valve pintle. The EVP sensor converts the mechanical movement of the pintle into an electrical voltage signal which is relayed to the PCM. The EVP sensor is a linear potentiometer in which resistance varies with the EGR valve pintle movement.Voltage is fed to the EVP by the signal return circuit. As the EGR is opened the EVP directs more voltage to the EEC and less down the voltage reference circuit. The EVP sensor provides the PCM with information on EGR flow and EGR system failures. The EVP should read between 0.24 and 0.67volts at idle with a closed EGR valve.

Possible causes:

•Damaged EVP sensor
•Corroded or dirty connector
•Damaged EGR valve
•Faulty Vacuum system
•Broken wire in harness
•Grounded harness
•Damaged Computer

EGR OPENING VOLTAGE

LT GRAY SENSOR

BLACK SENSOR

0%

0.50 volts

0%

0.90 volts

10%

0.75 volts

10%

1.25 volts

20%

1.10 volts

20%

1.65 volts

30%

1.45 volts

30%

1.95 volts

40%

1.80 volts

40%

2.30 volts

50%

2.15 volts

50%

2.65 volts

60%

2.50 volts

60%

3.00 volts

70%

2.85 volts

70%

3.35 volts

80%

3.20 volts

80%

3.70 volts

90%

3.55 volts

90%

4.05 volts

100%

3.90 volts

100%

4.40 volts

NOTE: Allow +/- .2 volts for all specifications
Ford EGR valves will open 100% at 8 inHg of vacuum. Therefore, 50% opening will be obtained by creating 4 inHg, etc.

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