Impreza WRX F4-2.0L DOHC Turbo (2004)
Compression Check: Mechanical Specifications
Compression Inspection
Note: Do measurement after warming-up engine, ignition switch off.
Standard ............................................................................................................................................... 981 - 1,177 kPa (10 - 12 kgf/cm2), 142 - 171 psi)
Limit ................................................................................................................................................................................. 882 kPa (9.0 kgf/cm2, 121 psi)
Difference between cylinders ..................................................................................................................................... 49 kPa (0.5 kgf/cm2, 7 psi), or less
Note: Crank engine rpm to 350 rpm at wide open throttle. Take at least two measurements per cylinder, and make sure that the values are correct.