Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1991PROTEGE L4-1839CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPECIFICATIONSMECHANICAL SPECIFICATIONS
1991 Mazda Protege L4-1839cc 1.8L SOHC
Mechanical Specifications
1991 Mazda Protege L4-1839cc 1.8L SOHCSECTION Mechanical Specifications
IDLE SPEED 750 ± 50 rpm [1]
Canadian models with A/T Approx. 800 rpm [2]
FIRING ORDER 1-3-4-2
DISTRIBUTOR LOCK BOLT TORQUE 14 - 19 ftlb (19 - 25 Nm)
SPARK PLUG TORQUE 11 - 17 ftlb (15 - 23 Nm)
SPARK PLUG GAP 0.039 - 0.043 in (1.0 - 1.1 mm)
RECOMMENDED SPARK PLUGS
NGK BKR5E-11 / BKR6E-11
Nippondenso K16PR-U11 / K20PR-U11
[1] Jumper between test connector "TEN" and "GND" terminals.
[2] With parking brake not applied.
Canadian models with A/T Approx. 800 rpm [2]
FIRING ORDER 1-3-4-2
DISTRIBUTOR LOCK BOLT TORQUE 14 - 19 ftlb (19 - 25 Nm)
SPARK PLUG TORQUE 11 - 17 ftlb (15 - 23 Nm)
SPARK PLUG GAP 0.039 - 0.043 in (1.0 - 1.1 mm)
RECOMMENDED SPARK PLUGS
NGK BKR5E-11 / BKR6E-11
Nippondenso K16PR-U11 / K20PR-U11
[1] Jumper between test connector "TEN" and "GND" terminals.
[2] With parking brake not applied.
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.