C 2500 Truck 2WD V8-454 7.4L VIN N TBI (1995)
EGR Valve: Testing and Inspection
RESULTS OF INCORRECT OPERATION
With too much EGR flow at idle, cruise, or cold operation, any of the following conditions may occur:
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Engine stops after cold start.
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Engine stops at idle after deceleration.
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Vehicle surges during cruise.
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Rough idle.
If the EGR valve should stay open all of the time, the engine may not idle.
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DTC 32 may set.
Too little or no EGR flow allows combustion temperatures to get too high during acceleration and load conditions. This could cause:
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Spark knock (detonation).
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Engine overheating.
SYSTEM CHECK
Diagnosis of the EGR system is covered in Computers and Control Systems / System Diagnosis / C Charts. See: Computers and Control
Systems/Testing and Inspection
