The Peugeot DDZ (XU9M) is a 1,905 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a cast iron block, aluminium cylinder head, and a single overhead camshaft (SOHC) with two valves per cylinder. Fuel delivery is managed by a Bosch L‑Jetronic electronic fuel injection system, producing a peak output of 83 kW (113 PS) and 162 Nm of torque.
Fitted primarily to the Peugeot 405 Mi16 and certain 309 GTI models, the DDZ was engineered for spirited performance and driver engagement. It offered a higher state of tune compared to other XU9 variants, featuring a more aggressive cam profile and higher compression. Emissions compliance for its era was managed through the electronic fuel injection and exhaust gas recirculation (EGR), meeting prevailing standards.
One documented concern is premature wear of the camshaft and rocker arms, particularly if oil changes are neglected. This issue, referenced in Peugeot Technical Note 9058A, is attributed to the engine's high-revving nature and the metallurgy of early production rocker arms. Later service campaigns introduced revised, more durable components to address this specific wear pattern.
Production years 1986–1992 meet the emissions standards applicable in their respective markets at the time of manufacture (as per EU Directive 88/77/EEC for later units).
The Peugeot DDZ (XU9M) is a 1,905 cc inline‑four naturally aspirated petrol engine engineered for performance-oriented models (1986-1992). It combines Bosch L-Jetronic fuel injection with a high-lift camshaft to deliver a responsive power band and strong mid-range pull. Designed to meet the emissions regulations of the late 1980s, it balances sporting character with acceptable fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,905 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 83.0 mm × 88.0 mm | |
| Power output | 83 kW (113 PS) @ 6,000 rpm | |
| Torque | 162 Nm @ 4,000 rpm | |
| Fuel system | Bosch L-Jetronic EFI | |
| Emissions standard | Pre-Euro / EU 88/77/EEC | |
| Compression ratio | 10.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | 10W-40 or 15W-50 mineral (API SF/CC) | |
| Dry weight | 135 kg |
The high-lift camshaft provides a lively, rev-happy character but demands diligent maintenance to prevent premature cam/rocker wear. Strict adherence to 10,000 km oil change intervals with high-quality mineral oil is critical for upper engine longevity. The Bosch L-Jetronic system requires a stable electrical system; voltage spikes can damage the ECU. Engines built before mid-1988 should have the rocker arms inspected and upgraded per Peugeot Technical Note 9058A if wear is evident. The timing chain is generally robust but should be inspected every 80,000 km.
Oil Specs: Requires API SF/CC specification mineral oil (Peugeot Owner's Manual). Modern semi-synthetics meeting these specs are acceptable.
Emissions: Pre-Euro certification; later units (post-1988) comply with EU Directive 88/77/EEC (EU Regulatory Archive).
Power Ratings: Measured under DIN 70020 standards (Peugeot Technical Specification Sheet).
Peugeot Workshop Manual: 405 (Edition 1988)
Peugeot Technical Note: 9058A (Camshaft/Rocker Arm Wear)
EU Directive 88/77/EEC (Emissions)
Peugeot EPC (Electronic Parts Catalogue) Ref. 1905XU9
The Peugeot DDZ (XU9M) was used across Peugeot's 405 and 309 platforms with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts and exhaust manifolds for the 405 Mi16-and no significant facelift revisions during its production run, ensuring broad interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front face of the cylinder block, just below the cylinder head and to the right of the water pump (Peugeot Workshop Manual 405). The code will read "DDZ" or "XU9M". Visually, it can be identified by its black rocker cover with "16 Soupapes" (16 valves) or "Injection" branding. Critical differentiation from the lower-powered XU9JA: The DDZ has a visibly larger, more complex intake manifold for the L-Jetronic system and a different camshaft profile. Parts are generally interchangeable with other XU9 engines, but camshafts and rocker arms are specific to the DDZ/XU9M variant.
The DDZ (XU9M)'s primary reliability risk is camshaft and rocker arm wear in early production units, with elevated incidence in high-mileage or poorly maintained examples. Peugeot service data indicated a notable number of engines required top-end rebuilds before 150,000 km if maintenance was irregular, while owner club surveys highlight ignition system faults as a common nuisance. Consistent oil changes and using the correct specification are critical for long-term durability.
Analysis derived from Peugeot technical bulletins (1986-1992) and owner club technical surveys (2010-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT DDZ-XU9J1.
Comprehensive technical documentation and regulatory references
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PEUGEOT Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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
Type-approval guidance and documentation.
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