Engine Compression

WARNING: This page is about a different car, the 1994 Mazda Navajo and 1994 Mazda B4000. 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. On Navajo, use remote starter switch to crank engine (DO NOT crank engine with ignition switch). On B4000, disconnect ignition coil primary wire connector.
On all models, hold throttle plate fully open. Crank engine, and note compression pressure.

COMPRESSION RATIO

Application	Specification
B4000	9.0:1
Navajo	9.0:1

COMPRESSION SPECIFICATIONS

Application

Minimum psi (kg/cm² ) @ RPM

Standard psi (kg/cm² ) @ RPM

B4000

134 (9.3) @ 300

250 (17.3) @ 300

Navajo

N/A

⁽¹⁾

⁽¹⁾	Lowest compression reading should not be less than 75 percent of highest compression reading.