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Home >> Honda >> 1984 >> Prelude Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> System Testing >> Cold Engine

Cold Engine

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  1. Ensure engine coolant temperature is below 140°F (60°C). Disconnect vacuum hose to distributor advance diaphragm B. Connect a vacuum gauge to hose.
  2. Start engine and check for vacuum at idle. If vacuum is present, go to Warm Engine test. If no vacuum is present, check for voltage at vacuum control solenoid valve in emission control box 4P connector Blue/Black wire.
  3. If there is voltage, replace vacuum control solenoid and retest. If there is no voltage, go to Trouble Shooting.
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