SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA1998PROTEGE DX, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGPRELIMINARY INSPECTION & ADJUSTMENTSMECHANICAL INSPECTIONCOMPRESSION
1998 Mazda Protege DX, Automatic

Mechanical Inspection: Compression

1998 Mazda Protege DX, AutomaticSECTION Compression

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 on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking, which can create a fire hazard or contaminate the engine's oiling system.
COMPRESSION SPECIFICATIONS

Application Minimum psi (kg/cm2 ) @ RPM Standard psi (kg/cm2 ) @ RPM
B2500 N/A (1)
B3000 & B4000 N/A (1)
Millenia (2)
2.3L 121 (8.5) @ 250 164 (11.5) @ 250
2.5L 132 (9.3) @ 300 189 (13.3) @ 300
MPV 121 (8.5) @ 300 164 (11.5) @ 300
Protege (2)
1.5L 146 (10.3) @ 300 195 (13.7) @ 300
1.8L 139 (9.8) @ 300 185 (13.0) @ 300
626 (2)
2.0L 119 (8.4) @ 300 171 (12.0) @ 300
2.5L 141 (9.9) @ 250 203 (14.3) @ 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

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.