Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

1991 Plymouth Colt Base, StandardFACTORY OEM SERVICE PROCEDURE

Engine Compression

Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed and throttle wide open.

COMPRESSION SPECIFICATIONS

Application ⁽¹⁾

Specification

Compression Ratio

1.5L (VIN A)

9.4:1

1.6L (VIN Y)

9.2:1

1.8L (VIN T)

9.0:1

2.0L (VIN R)

9.0:1

2.0L (VIN U)

9.0:1

2.0L (VIN V)

8.5:1

2.4L (VIN W)

8.5:1

3.0L (VIN B)

10.0:1

3.0L (VIN C)

8.0:1

3.0L (VIN S)

8.9:1

Compression Pressure ⁽²⁾

1.5L (VIN A)

137 psi (9.6 kg/cm² )

1.6L (VIN Y)

171 psi (12.0 kg/cm² )

1.8L (VIN T)

131 psi (9.2 kg/cm² )

2.0L (VIN R)

137 psi (9.6 kg/cm² )

2.0L (VIN U)

114 psi (8.0 kg/cm² )

2.0L (VIN V)

119 psi (8.4 kg/cm² )

2.4L (VIN W)

119 psi (8.4 kg/cm² )

3.0L (VIN B)

139 psi (9.8 kg/cm² )

3.0L (VIN C)

115 psi (8.1 kg/cm² )

3.0L (VIN S)

119 psi (8.4 kg/cm² )

⁽¹⁾	See ENGINE/VIN ID article.

⁽²⁾	Maximum variation between cylinders is 14 psi (1.0 kg/cm² )

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.