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 MANUALSHONDA1993ACCORD L4-2156CC 2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONDESCRIPTION AND OPERATION
1993 Honda Accord L4-2156cc 2.2L SOHC
Exhaust Gas Recirculation: Description and Operation
1993 Honda Accord L4-2156cc 2.2L SOHCSECTION Description and Operation
Exhaust Gas Recirculation (EGR) System:
PURPOSE
Exhaust gas recirculation reduces oxides of nitrogen emissions in the vehicle exhaust. The EGR system uses partial recirculation of exhaust gases from a port in the cylinder head to a port in the intake manifold to lower combustion chamber temperature.
OPERATION
When the electronic control unit (ECM) determines conditions are suitable for EGR operation it connects the ground supply to the solenoid. This allows the solenoid to connect the inlet and outlet ports, allowing ported manifold vacuum to be applied to the EGR valve diaphragm.
The EGR system is also equipped with a lift-sensor. It sends a signal to the ECM of how far the EGR valve is open. With information from the lift-sensor, the PGM-FI ECM controls the amount of exhaust gas entering the combustion chamber, by varying the voltage to the EGR Control Solenoid valve.
RENDER: 1.0x
NO RELATED
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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.