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Home >> BMW >> 1997 >> 328is Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments - Except V12 >> Introduction >> Engine Compression >> 4-Cylinder

Engine Compression: 4-Cylinder

  1. Deactivate fuel injection system by removing Digital Motor Electronics (DME) master relay and fuel pump relay before performing compression test. See DME & FUEL PUMP RELAY LOCATION  table. Ensure battery is fully charged.
  2. Ensure engine coolant temperature does not exceed 95°F (35°C). Turn fasteners (2  ) on electric lead cover 90 degrees and remove electric lead cover. Disconnect spark plug connectors.
  3. Using 16-mm Socket (12-1-171) and Torque Limiter (12-1-172), remove spark plugs. Use Pressure Gauge (11-0-162), Test Adapter (11-0-166) and Tube Extension (11-0-167) to check compression pressure. See COMPRESSION SPECIFICATIONS  table.
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