Engine Compression
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1999 BMW Z3, 1999 BMW M3, 1999 BMW M Roadster, 1999 BMW M Coupe, and 1999 BMW 750iL. However, it is still accessible from the selected car via links, so may be relevant.
Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open. The DME master relay and/or fuel pump relay MUST be pulled out for compression test. See ON-VEHICLE ADJUSTMENTS article for additional information.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Pressure | ||
| Except M5 | 142-156 psi (10-11 kg/cm2 ) | |
| M5 | 170-199 psi (12-14 kg/cm2 ) | |