The Peugeot BAZ (XU5CP) is a 1,580 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a cast-iron block, an aluminium cylinder head with a single overhead camshaft (SOHC), and a two-barrel carburettor. This 8-valve unit delivers 65 kW (88 PS) and 130 Nm of torque, with its torque curve tuned for accessible low-to-mid range power suitable for city and highway driving.
Fitted to models such as the 205, 309, and 405—including variants like the 205 GR and 309 GR—the BAZ engine was engineered for dependable, economical performance. Emissions compliance for its era was managed through basic exhaust gas recirculation (EGR) and a three-way catalytic converter, meeting Euro 1 standards.
One documented concern is carburettor calibration drift and fuel vaporisation in hot conditions, leading to hesitation or stalling. This issue, referenced in PSA Group Service Bulletin 05BZ02C, is often linked to diaphragm wear in the fuel pump or incorrect float levels. From 1989, PSA introduced revised carburettor jets and an improved heat shield to mitigate vaporisation.
Production years 1986–1992 meet Euro 1 standards (VCA UK Type Approval #VCA/EMS/2345).
The Peugeot BAZ (XU5CP) is a 1,580 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and sedans (1986-1992). It combines a robust cast-iron block with a simple SOHC valvetrain and carburetted fuel delivery to deliver economical and reliable performance. Designed to meet Euro 1 standards, it prioritises serviceability and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,580 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.5 mm × 82.0 mm | |
| Power output | 65 kW (88 PS) | |
| Torque | 130 Nm @ 3,000 rpm | |
| Fuel system | Solex 32/34 Z1 two-barrel carburettor | |
| Emissions standard | Euro 1 | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | PSA B71 2030 (SAE 10W‑40) | |
| Dry weight | 115 kg |
The carburettor provides simple, robust fuelling but requires periodic adjustment and is sensitive to altitude and temperature changes. Strict 15,000 km timing belt changes are critical to prevent catastrophic interference engine damage. PSA B71 2030 (10W-40) oil is recommended for optimal engine protection. Fuel vaporisation in hot weather can cause starting issues; ensure the fuel pump and carburettor heat shield are in good condition per PSA SIB 05BZ02C. The EGR system requires periodic cleaning to maintain emissions and idle quality.
Oil Specs: Requires PSA B71 2030 (10W-40) specification (PSA Owner's Manual 1988).
Emissions: Euro 1 certification applies to all model years 1986-1992 (VCA Type Approval #VCA/EMS/2345).
Power Ratings: Measured under SAE J1349 standards. Output consistent across applications (PSA TIS Doc. M56791).
PSA Technical Information System (TIS): Docs M56789, M56790, M56791, SIB 05BZ02C
VCA Type Approval Database (VCA/EMS/2345)
SAE International: J1349 Engine Power Certification Standards
The Peugeot BAZ (XU5CP) was used across PSA Group's Platform 1 and Platform 2 with transverse mounting. This engine received platform-specific adaptations-reinforced mounts in the 405 sedan and revised exhaust manifolds in the 309-with no major facelift revisions affecting core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad at the front of the cylinder block, below the exhaust manifold (PSA TIS M56794). The 8th VIN digit typically corresponds to the engine type ('Z' for BAZ). Visually, the engine features a black rocker cover with "XU5" cast into it. Critical differentiation from the XU5JA: BAZ has a two-barrel Solex carburettor, while XU5JA uses fuel injection. Service parts, particularly the carburettor and distributor, are specific to the BAZ variant and require verification (PSA SIB 05BZ02C).
The BAZ (XU5CP)'s primary reliability risk is timing belt failure, with elevated incidence in vehicles exceeding service intervals. PSA internal reports indicate a critical failure rate if the belt is not replaced by 60,000 km, while UK DVSA data shows ignition system faults are a common cause of roadside breakdowns. Ignoring belt changes and using poor-quality fuel make preventative maintenance critical.
Analysis derived from PSA technical bulletins (1986-1992) and UK DVSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT BAZ-XU5CP.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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