Engine Compression: V12
Deactivate fuel injection system by removing Digital Motor Electronics (DME) master relay and disconnecting ignition coils before performing compression test. Ensure battery is fully charged. Remove DME master relay. Remove engine covers as necessary to access spark plugs. Remove spark plugs. See SPARK PLUGS in REMOVAL, OVERHAUL & INSTALLATION article. Screw Test Adapter (11-0-226) by hand into spark plug thread. Attach Pressure Gauge (11-0-224) to adapter to check compression pressure.
COMPRESSION SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Compression Pressure | ||
| 6-Cylinder | 142-156 psi (10-11 kg/cm2 ) | |
| V8 | 170-199 psi (12-14 kg/cm2 ) | |
| V12 | 142-170 psi (10-12 kg/cm2 ) | |