The Mazda FEFA is a 1,998 cc, inline‑four petrol engine produced between 1983 and 1991. It features a cast iron block, aluminium head, SOHC 8‑valve layout, and throttle — body fuel injection. This robust design prioritised durability and ease of maintenance for everyday use.
Fitted to models such as the 626 (GC platform), 323 (BF platform), and MX — 6 (first generation), the FEFA was engineered for reliable, economical transportation. Emissions compliance for its era was…
Mazda
Production years 1983–1991 meet applicable emissions standards for their respective markets and model years (UK VCA Type Approval records for period).
The Mazda FEFA is a 1,998 cc inline‑four petrol engine engineered for mid‑size sedans and coupes (1983-1991). It combines throttle-body fuel injection with a simple SOHC valvetrain to deliver dependable, economical performance. Designed to meet emissions regulations of its era, it prioritises serviceability and longevity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,998 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 77–85 kW (105–115 PS) | |
Torque | 162–172 Nm @ 3,500 rpm | |
Fuel system | Throttle-body injection (TBI) | |
Emissions standard | Prevailing national standards (e.g., US Federal, Japanese 1983) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 10W-30 or 10W-40 (API SF/CC) | |
Dry weight | Not specified in available OEM documentation |
The Mazda FEFA was used across Mazda's GC/BF platforms with longitudinal mounting. This engine received minor ECU and accessory drive adaptations between the 626 sedan and MX-6 coupe, creating minor parts variations. All adaptations are documented in OEM technical bulletins.
The FEFA's primary reliability risk is distributor drive gear failure, with elevated incidence in high-mileage or poorly maintained engines. While not tracked by modern government agencies, workshop data indicates it is a frequent cause of roadside breakdowns for this generation. Neglecting valve adjustments or using incorrect oil can accelerate wear on ancillary components.
Analysis derived from Mazda workshop manuals (1983-1991) and aggregated independent workshop failure reports. Repair procedures should follow manufacturer guidelines.
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The FEFA is renowned for its mechanical robustness and potential for high mileage with basic care. Its main Achilles' heel is the distributor drive gear, which should be pre-emptively replaced. Regular oil changes and valve adjustments are key to its legendary longevity.
The top issues are distributor drive gear failure, noisy valve train from lack of adjustment, throttle body/idle problems, and cooling system leaks from aging hoses and gaskets. These are well-documented in Mazda service literature.
The FEFA powered the 626 (GC, 1983-1987), 323 (BF, 1985-1989), and the first-generation MX-6 (1988-1991). It was also used in the first-generation Ford Probe (1989-1992), which was a Mazda 626/MX-6 twin.
Significant power gains are limited by the SOHC head and TBI. Basic mods include a free-flow exhaust, performance air filter, and ignition upgrades. More power requires head work or swapping to an FE-DOHC or turbocharged engine.
Expect around 8.5-9.5 L/100km (30-28 mpg UK) combined for a 626 sedan. Real-world economy depends heavily on driving style, condition, and whether the distributor gear has been upgraded to prevent misfires.
No. The FEFA is a non-interference engine. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic internal damage. The engine will simply stop running.
Mazda originally specified SAE 10W-30 or 10W-40 with API SF/CC rating. Modern high-quality 10W-40 or 5W-40 synthetic or semi-synthetic oils meeting API SM/SN or higher are perfectly suitable and offer better protection.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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