LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1984 >> Prelude Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> System Testing >> Cold Engine
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Cold Engine

  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.
scientia non olet · About LEMON Manuals