Toyota Supra 1990 Manual page 53

ENGINE MECHANICAL - Compression Check
EM-21
(7M-GTE)
1. WARM UP ENGINE
2. DISCONNECT CAM POSITION SENSOR CONNECTOR
3. DISCONNECT SOLENOID RESISTOR CONNECTOR
4. REMOVE NO.1 AIR CLEANER HOSE
(See step 1 on page EM-12)
5. REMOVE PCV PIPE
6. REMOVE IGNITION COIL
(See steps 6. 7 on page EM-13)
7. REMOVE SPARK PLUGS
8. CHECK CYLINDER COMPRESSION PRESSURE
(See step 7 on page EM-20)
Compression pressure:
10.0 kg/cm2 (142 psi. 981 kPa) or more
Minimum pressure:
9.0 kg/cm2 (128 psi. 883 kPa)
Difference between each cylinder:
1.0 kg/cm2 (14 psi. 98 kPa) or less