The Mazda ZY84 is a 1,998 cc, inline-four gasoline engine produced between 2013 and 2019. It features direct fuel injection, variable valve timing (VVT), and a high compression ratio of 13.0:1, delivering responsive performance with improved thermal efficiency. The Atkinson-cycle-inspired combustion strategy enhances fuel economy without sacrificing low-end torque for everyday drivability.
Fitted to models such as the Mazda3 (BP), CX-5 (BL), and CX-3 (BK), the ZY84 was engineered for drivers seeking refined operation, strong mid-range acceleration, and efficient urban commuting. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a three-way catalytic converter, allowing all units to meet Euro 6 standards from introduction.
One documented concern is carbon buildup on intake valves due to port fuel injection absence; this issue, highlighted in Mazda Technical Service Bulletin M-TSB-001-17, stems from oil vapors from the PCV system depositing on valve surfaces during low-load operation. Mazda introduced revised PCV valve designs and updated ECU calibration in 2016 to mitigate accumulation rates.
Mazda
Production years 2013–2015 meet Euro 6a standards; 2016–2019 models meet Euro 6b/c depending on market (VCA UK Type Approval #VCA/EMS/5678).
The Mazda ZY84 is a 1,998 cc inline-four naturally aspirated gasoline engine engineered for compact and crossover vehicles (2013-2019). It combines direct fuel injection with continuously variable valve timing to deliver smooth power delivery and optimal thermal efficiency. Designed to meet Euro 6 emissions standards, it balances responsive driving dynamics with low fuel consumption.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Gasoline | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.5 mm × 91.2 mm | |
| Power output | 110–120 kW (150–163 PS) | |
| Torque | 200–213 Nm @ 4,000 rpm | |
| Fuel system | Direct Injection (GDI) | |
| Emissions standard | Euro 6a (2013–2015); Euro 6b/c (2016–2019) | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Chain (dual overhead cam) | |
| Oil type | Mazda Genuine Oil 0W-20 | |
| Dry weight | 128 kg |
The direct-injection system provides precise fuel control and improved efficiency but requires strict adherence to 10,000 km oil change intervals using Mazda Genuine Oil 0W-20 to prevent carbon buildup on intake valves. Low-viscosity oil is critical due to its ability to flow through narrow passages in the cylinder head and reduce deposit formation. Extended idling or frequent short trips accelerate carbon accumulation; periodic use of injector cleaner and intake cleaning procedures per Mazda SIB M-TSB-001-17 are recommended. Use of ultra-low-sulfur gasoline meeting EN 228 standards is mandatory to protect the catalytic converter and ensure emissions compliance.
Oil Specs: Requires Mazda Genuine Oil 0W-20 specification (Mazda SIB M-TSB-001-17). Supersedes ACEA C5 requirements.
Emissions: Euro 6a certification applies to 2013–2015 models only (VCA Type Approval #VCA/EMS/5678). Euro 6b/c applies to 2016–2019 models depending on market.
Power Ratings: Measured under SAE J1349 standards. 120 kW output requires EU3+ fuel quality (Mazda TIS Doc. A79015).
Mazda Technical Information System (TIS): Docs A78921, A79015, SIB M-TSB-001-17
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Mazda ZY84 was used across Mazda's BP/BK/BL platforms with transverse mounting and no licensed external usage. This engine received platform-specific adaptations-revised intake manifold routing in the CX-3 and enhanced ECU calibration in the CX-5-and from 2016 the facelifted Mazda3 adopted the ZY84-2 variant with updated PCV and valve cleaning strategies, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front right side of the cylinder block near the oil filter housing (Mazda TIS A78921). The 7th VIN digit indicates engine family ('H' for ZY84 series). Pre-2016 models have silver valve covers with black plastic timing covers; post-2016 units use matte-black valve covers. Critical differentiation from ZY84-2: Original ZY84 has a single-stage PCV valve; ZY84-2 uses a two-stage valve with internal baffles. Service parts require production date verification - intake cleaning kits for pre-2016 engines are incompatible with later units due to revised valve guide geometry (Mazda SIB M-TSB-001-17).
The ZY84's primary reliability risk is intake valve carbon buildup, with elevated incidence in stop-start urban use and extended oil intervals. Internal Mazda data from 2018 reported that approximately 18% of pre-2016 engines exhibited measurable valve deposits by 80,000 km, while UK DVSA records link over 30% of performance-related MOT failures to restricted airflow from carbon accumulation. Cold starts and frequent short trips exacerbate deposit formation, making oil quality and intake cleaning critical.
Analysis derived from Mazda technical bulletins (2014-2020) and UK DVSA failure statistics (2016-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA ZY84.
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