1994 Mazda MX-3 Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Compression

  1. Warm engine to normal operating temperature. Remove all spark plugs. Disconnect ignition coil primary wire connector.
  2. Hold throttle plate fully open. Crank engine, and note compression pressure.
COMPRESSION RATIO

Application Specification
MX-3
1.6L 9.4:1
1.8L 9.2:1
Protege
DOHC 9.3:1
SOHC
California 9.3:1
Federal 9.0:1
323
California 9.3:1
Federal 9.0:1
COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm2 ) @ RPM Standard psi (kg/cm2 ) @ RPM
MX-3
1.6L 135 (9.5) @ 300 192 (13.5) @ 300
1.8L 142 (10.0) @ 300 198 (13.6) @ 300
Protege
SOHC (1) 121 (8.5) @ 300 173 (12.2) @ 300
DOHC (1) 128 (9.0) @ 300 182 (12.8) @ 300
323 135 (9.5) @ 300 192 (13.5) @ 300
(1) Difference between cylinders should not be more than 28 psi (2.0 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.

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