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Home >> Mini >> 2012 >> Cooper Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Adjustments - Except V12) >> Introduction >> Engine Compression >> 4-Cylinder
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Engine Compression: 4-Cylinder

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 1997 BMW Z3, 1997 BMW M3, 1997 BMW 840Ci, 1997 BMW 740iL, and 1997 BMW 740i. However, it is still accessible from the selected car via links, so may be relevant.
  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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