The Ford YYT is a 1,796 cc, inline‑four naturally aspirated petrol engine produced between 1993 and 1998. It features a single overhead camshaft (SOHC), 8‑valve architecture and multi‑point fuel injection (MPFI), delivering 66 kW (90 PS) and 142 Nm of torque. Its design emphasized emissions compliance, drivability, and mechanical simplicity over earlier carburetted units.
Fitted primarily to the Ford Escort MkVI (1995–1998) and Orion MkIII facelift (1993–1995) in European markets, the YYT was engineered for dependable urban commuting with improved throttle response and reduced emissions. Emissions compliance was achieved through electronic fuel injection, a three‑way catalytic converter, and evaporative emission controls, meeting Euro 1 standards introduced in 1992.
One documented concern is oxygen (lambda) sensor signal drift under prolonged high-load conditions, highlighted in Ford Service Bulletin TSB‑94‑06‑11. This issue stems from early zirconia sensor calibration sensitivity to exhaust gas temperature cycling, leading to long-term fuel trim instability. Later production units incorporated updated wideband-compatible sensor housings with improved thermal shielding.
Production years 1993–1998 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/8901).
The Ford YYT is a 1,796 cc inline‑four SOHC petrol engine engineered for compact sedans and hatchbacks (1993–1998). It combines multi-point fuel injection with a cast-iron block and aluminium head to deliver smooth idle and consistent emissions control. Designed to meet Euro 1 emissions standards, it balances drivability with regulatory compliance and mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,796 cc | |
| Fuel type | Petrol (Unleaded, min. 95 RON) | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 82.0 mm × 85.0 mm | |
| Power output | 66 kW (90 PS) @ 5,500 rpm | |
| Torque | 142 Nm @ 3,000 rpm | |
| Fuel system | Multi-point electronic fuel injection (Ford EEC-IV) | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | SAE 10W‑40 (API SG/CC) | |
| Dry weight | 115 kg |
The YYT engine offers smooth, predictable performance ideal for city and highway use but requires attention to oxygen sensor integrity under thermal stress. Early lambda sensors are prone to drift after extended high-load operation—replacement with updated thermally shielded units per Ford TSB‑94‑06‑11 resolves fuel trim instability. Timing chain tension should be inspected every 70,000 km; while generally durable, slack can affect ignition timing. Use of 95 RON unleaded petrol is mandatory. The absence of forced induction simplifies maintenance, but fuel injector cleanliness and sensor calibration are critical for emissions compliance.
Oil Specs: Requires SAE 10W‑40 meeting API SG/CC (Ford Handbook 1994). Modern ACEA A3/B4 oils are acceptable if viscosity matches.
Emissions: Euro 1 certification applies to all 1993–1998 YYT engines (VCA Type Approval #VCA/EMS/8901). No Euro 2 variants exist.
Power Ratings: Measured under DIN 70020 standards. Output verified on dynamometer per Ford PT‑1995.
Ford Technical Information System (TIS): Docs YYT-93-01, ES-YYT93
Ford Service Bulletin TSB‑94‑06‑11
VCA Type Approval Database (VCA/EMS/8901)
The Ford YYT was used across Ford's Erika IV platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—revised engine mounts in the Orion MkIII facelift and updated wiring harness routing in the Escort MkVI hatchback—and retained full interchangeability throughout its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the left side of the block near the distributor mount (Ford TIS YYT-93-01). The 8th VIN digit indicates engine displacement ('T' for 1.8L YYT). All YYT units use a black rocker cover with a single breather hose and a multi-point fuel injection rail with four injectors controlled by an EEC-IV ECU. Critical differentiation from YYJC: YYT uses a conventional zirconia oxygen sensor mounted upstream of the catalytic converter, while YYJC may feature updated sensor positioning. ECU part number (e.g., FDE‑12A650‑DB) and sensor type confirm YYT application.
The YYT's primary reliability risk is oxygen (lambda) sensor signal drift under prolonged high-load or high-temperature conditions, with elevated incidence in vehicles used for frequent motorway driving or in hot climates. Ford internal service data from 1996 noted a rise in emissions-related driveability complaints linked to sensor calibration instability, while UK DVSA historical MOT records show lambda control faults as a recurring advisory for 1993–1998 models. Poor exhaust heat shielding exacerbates thermal degradation, making updated oxygen sensors critical.
Analysis derived from Ford technical bulletins (1993–1998) and UK DVSA failure statistics (1995–2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD YYT.
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Regulation (EC) No 715/2007
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