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 MANUALSCHEVROLET1982CELEBRITY L4-151 2.5LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONDESCRIPTION AND OPERATION
1982 Chevrolet Celebrity L4-151 2.5L
Exhaust Gas Recirculation: Description and Operation
1982 Chevrolet Celebrity L4-151 2.5LSECTION Description and Operation
Fig. 57 Single Diaphragm EGR Valve Cross Section:
Fig. 58 Dual Diaphragm EGR Valve Cross Section:
PURPOSE
The Exhaust Gas Recirculation (EGR) System reduces oxides of nitrogen (NOx) produced during combustion.
OPERATION
Nitrogen combines with oxygen--forming NOx--more readily when combustion temperatures exceed 2500° F.
The EGR system reduces formation of NOx by routing exhaust gases into the intake manifold--lowering combustion temperatures up to 500° F.
- When ported vacuum reaches approximately 3 in Hg the EGR diaphragm begins to move upward--against spring tension--opening the EGR valve--mounted on the intake manifold--Fig 57--allowing exhaust gas to enter the intake manifold via exhaust crossover channels.
- As the throttle valves are opened engine speed and ported vacuum increase opening the valve further.
- The EGR valve should be fully open at approximately 7 to 8 in Hg.
At Idle - The EGR valve should be closed--The addition of exhaust gas to the air/fuel mixture at idle causes rough idling.
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.