Impreza Coupe FWD F4-1820cc 1.8L SOHC (1995)
Compression Check: Testing and Inspection
When checking compression pressures, ensure engine is at normal operating temperature and battery is completely charged. Remove all spark plugs and
open throttle fully. Remove ignition coil harness, then install a suitable compression gauge. Crank engine and note compression gauge reading when
gauge pointer is steady. Perform at least two measurements per cylinder to ensure compression readings are correct. The maximum compression
difference between cylinders is 14 psi. Compression pressures should be 135-156 psi at 300 RPM.
