Engine Compression: Supra
- Warm engine to normal operating temperature. On turbo models, unplug cam position sensor and solenoid resistor connectors. Remove air cleaner hose and PCV pipe. Remove ignition coil cover and ignition coil. Remove all spark plugs. Check compression pressure.
- On non-turbo models, unplug solenoid resistor and cold start injector connectors. Disconnect high tension wire from ignition coil. Remove PCV hose. Disconnect and plug coolant by-pass hoses.
- Disconnect all hoses going to throttle body. Disconnect throttle position sensor. Remove throttle body bracket, throttle body, and gasket. Remove all spark plugs. Check compression pressure.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Compression Ratio | |||
| Cressida | 9.2:1 | ||
| Land Cruiser | 8.1:1 | ||
| Supra | |||
| Non-Turbo | 9.2:1 | ||
| Turbo | 8.4:1 | ||
| Normal Compression Pressure | |||
| Cressida | 164 psi (11.5 kg/cm2 ) | ||
| Land Cruiser | 149 psi (10.5 kg/cm2 ) | ||
| Supra | |||
| Non-Turbo | 156 psi (10.9 kg/cm2 ) | ||
| Turbo | 142 psi (10.0 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| Cressida & Supra | 128 psi (9.0 kg/cm2 ) | ||
| Land Cruiser | 114 psi (8.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| Cressida & Supra | 14 psi (1.0 kg/cm2 ) | ||
| Land Cruiser | 7 psi (.5 kg/cm2 ) | ||