Compression Pressure
With battery fully charged, engine at normal operating temperature, throttle fully open and engine at cranking speed, compression pressure should be as follows:
NOTE:
Deactivate fuel injection system by pulling off connection "V at the coil prior to compression test.
Compression Pressure
| Application | Pressure | |
|---|---|---|
| 528i | ||
| Good | Above 156 psi (11 kg/cm2 ) | |
| Normal | 142-156 psi (10-11 kg/cm2 ) | |
| Poor | Below 142 psi (10 kg/cm2 ) | |
| 633CSi & 733i | ||
| Good | Above 142 psi (10 kg/cm2 ) | |
| Normal | 121-142 psi (8.5-10 kg/cm2 ) | |
| Poor | Below 121 (8 kg/cm2 ) | |