Mechanical Inspection: Compression

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1991 Plymouth Colt Vista, 1991 Plymouth Colt, 1991 Mitsubishi Pickup, 1991 Mitsubishi Montero, and 1991 Mitsubishi Mirage. However, it is still accessible from the selected car via links, so may be relevant.

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.

WARNING: DO NOT use ignition switch during compression tests. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine's oiling system.

COMPRESSION SPECIFICATIONS ⁽¹⁾

Application

Specification psi (kg/cm² )

1.5L (VIN X)

137 (9.6)

1.6L (VIN Y)

171 (12.0)

1.8L (VIN T)

131 (9.2)

2.0L (VIN R) DOHC

137 (9.6)

2.0L (VIN U) DOHC Turbo

114 (8.0)

2.0L (VIN V) SOHC

119 (8.4)

2.4L (VIN W) SOHC

119 (8.4)

3.0L (VIN S) SOHC

119 (8.4)

3.0L (VIN B) DOHC

139 (9.8)

3.0L (VIN C) DOHC Turbo

115 (8.1)

⁽¹⁾	Maximum variation between cylinders 14 psi (1.0 kg/cm² )