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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 26876
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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95 Ford explorer: wont start..fuel pump runs..start with starter fluid

Customer Question

My 95 Ford explorer wont start. the fuel pump runs continuously. it will start with starter fluid until it burns that off. i have replaced the fuel pump and experience the same problem. the fuel filter has been replaced. i can hear the fuel pouring back into the fuel tank from the return line. however, the engine continues to turn over but will never start.
Submitted: 6 years ago.
Category: Ford
Expert:  Ron replied 6 years ago.

HiCustomer

Thank you for asking your question on Just Answer.

From your discription this sounds like you may have a bad PCM (computer) the PCM controls the Fuel pump relay thru ground switching.

Access the Powertrain Control Module (PCM). Leaving it connected check for battery voltage on pins 37 and 57 Red wires. If battery voltage is not present, check for a problem at the PCM power relay.

If battery voltage is present on the Red wires, check for 5v on pin 26 Brown/White (BR/WH) wire. If the voltage is not 5v +/- 0.1v, disconnect the Throttle Position Sensor (TPS) and Differential Pressure Feedback EGR (DPFE) sensor one at a time to see if one is shorted and pulling the voltage down. If the voltage is low and returns to 5v after disconnecting either sensor, replace the shorted sensor.
If the 5v reference voltage (vref) is correct, check the PCM grounds on pins 20 Black (BK) wire, 40 and 60 Black/White (BK/W) wires. If the grounds are good, power feeds are good, and the vref is at 5v, suspect a faulty PCM.

 

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