1990 Plymouth Laser Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Compression

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

ENGINE COMPRESSION TEST

Application RPM (1) psi (kg/cm2 )
1.8L 250-400 130 (9.1)
2.0L 250-400 137 (9.6)
2.0L Turbo 250-400 114 (8.0)
(1) Maximum allowable difference between cylinders is 14 psi (.98 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:

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

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