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6-Cylinder & V8

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1999 BMW Z3, 1999 BMW M3, 1999 BMW M Roadster, 1999 BMW M Coupe, and 1999 BMW 740iL. 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 86°F (30°C). Remove oil filler cap. Remove 2 nut covers and nuts securing cylinder head cover(s). Remove cylinder head cover(s). Disconnect ignition coil connectors.
  3. Remove ignition coils. 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.
Fig 1: Locating Fuel Pump Relay (Z3)
G99B05499Courtesy of BMW OF NORTH AMERICA, INC.
Fig 2: Locating DME & Fuel Pump Relays (318ti)
G98G11292Courtesy of BMW OF NORTH AMERICA, INC.
Fig 3: Locating DME & Fuel Pump Relays (E36 - Except Z3)
G98H11293Courtesy of BMW OF NORTH AMERICA, INC.
Fig 4: Locating Fuel Pump Relay (E46)
G99G05492Courtesy of BMW OF NORTH AMERICA, INC.
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