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Home >> Honda >> 1988 >> Prelude Si, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> System Testing >> Cold Engine >> Carbureted

Cold Engine: Carbureted

  1. Ensure coolant temperature is less than 131°F (55°C) on Accord models or less than 145°F (63°C) on Prelude 49-state models. Disconnect vacuum hose from EGR valve and connect vacuum gauge to hose. Start engine and increase engine speed to 3000 RPM. EGR valve should not receive vacuum. If vacuum is not available to EGR valve, proceed to HOT ENGINE  test.
  2. If vacuum is present on Accord models, replace thermovalve A and retest. If vacuum is present on Prelude 49-state models, proceed to EGR CUT-OFF SOLENOID test.
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