Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONDESCRIPTION AND OPERATION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Exhaust Gas Recirculation: Description and Operation
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Description and Operation
Typical Electronic EGR System:
The Electronic EGR Valve is required in EEC systems where EGR is controlled according to the computer demands by means of an EGR Valve Position (EVP) sensor attached to the valve. A vacuum signal from the electronic vacuum regulator operates the valve. The vacuum signal overcomes the spring load and actuates the valve diaphragm. The pintle is then lifted off its seat, allowing exhaust gas to recirculate or flow. The flow amount is directly proportional to the pintle position. The Electronic Control Assembly receives an electronic signal from the EVP sensor (mounted on top of the valve) indicating its position.
NOTE: Refer to "Vacuum Components" for a description and operation of other vacuum related components for this system.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.