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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (ENGINE CONTROLS - SERVICE & ADJUSTMENT SPECIFICATIONS)MECHANICAL CHECKSENGINE COMPRESSION
1999 Mazda 626 ES, 2.5 D, Standard

Engine Compression

1999 Mazda 626 ES, 2.5 D, StandardSECTION Engine Compression
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Mazda Tribute, 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, and 2002 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

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

COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm 2 ) @ RPM Standard psi (kg/cm 2 ) @ RPM
B2300 (1) (1)
B3000 & B4000 (1) (1)
Miata (2) 146 (10.3) @ 300 198 (13.9) @ 300
Millenia (2)
2.3L 120 (8.5) @ 250 164 (11.5) @ 250
2.5L 130 (9.3) @ 300 189 (13.3) @ 300
MPV (1) (1)
Protege & Protege5 (2)
2.0L 119 (8.4) @ 300 171 (12.0) @ 300
Tribute
2.0L (1) (1)
3.0L (1) (1)
626 (2)
2.0L 119 (8.4) @ 300 171 (12.0) @ 300
2.5L 141 (9.9) @ 250 202 (14.2) @ 250
(1) Lowest compression reading should not be less than 75 percent of highest compression reading.
(2) Difference between cylinders should not be more than 28 psi (2.0 kg/cm2 ).
RENDER: 1.0x

NO RELATED

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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.