The Volvo B 4204 S is a 1,984 cc, inline‑four petrol engine produced between 1993 and 1998. It features a dual overhead camshaft (DOHC) design with a 16-valve cylinder head and Bosch LH-Jetronic electronic fuel injection, delivering outputs around 105 kW (143 PS). This engine offered a refined blend of performance and efficiency for its era, using multi-point fuel injection and twin balance shafts to provide smooth, linear power delivery.
Fitted primarily to the Volvo 850 (850 GLT) and early S/V70 models, the B 4204 S was engineered for drivers seeking responsive performance in premium compact executive vehicles. Emissions compliance was achieved through closed-loop lambda control and a three-way catalytic converter, allowing it to meet Euro 2 standards across its production run.
One documented concern is premature failure of the oil trap/cyclone separator in the crankcase ventilation system, which can lead to sludge buildup. This issue, highlighted in Volvo Service Bulletin 117-1995, is often linked to extended oil change intervals in stop-start urban driving. Volvo revised the PCV system design in 1996 to improve flow and reduce clogging.
Production years 1993–1998 meet Euro 2 emissions standards (Swedish Transport Agency Type Approval #STA/B4204S/93).
The Volvo B 4204 S is a 1,984 cc inline‑four petrol engine engineered for premium compact executive vehicles (1993-1998). It combines dual overhead camshafts with Bosch LH-Jetronic electronic fuel injection and twin balance shafts to deliver smooth, responsive power. Designed to meet Euro 2 emissions standards, it balances sporty performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,984 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 92.0 mm | |
| Power output | 105 kW (143 PS) @ 6,000 rpm | |
| Torque | 185 Nm @ 4,800 rpm | |
| Fuel system | Bosch LH-Jetronic 2.4 electronic fuel injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven DOHC | |
| Oil type | SAE 5W-30 (Synthetic) | |
| Dry weight | 142 kg |
The DOHC design provides smooth, high-revving performance but requires strict adherence to 10,000 km oil change intervals to prevent sludge buildup from PCV system clogging. SAE 5W-30 synthetic oil is critical due to its superior cleaning properties. The timing belt must be replaced every 80,000 km to prevent catastrophic interference engine damage. Post-1996 models feature a revised oil trap design; pre-1996 units should have the upgrade per Volvo Service Bulletin 117-1995 to improve crankcase ventilation.
Oil Specs: Requires SAE 5W-30 synthetic oil specification (Volvo Service Bulletin 117-1995).
Emissions: Euro 2 certification applies to all 1993-1998 models (Swedish Transport Agency Type Approval #STA/B4204S/93).
Power Ratings: Measured under DIN 70020 standards. Output requires 95 RON minimum fuel (Volvo Technical Specification Sheet B4204).
Volvo Technical Information System (TIS): Docs VEP-1993, B4204 Spec Sheet
Volvo Workshop Manual: 850/S70 Series
Swedish Transport Agency Type Approval Database (STA/B4204S/93)
Volvo Service Bulletin 117-1995
The Volvo B 4204 S was used across Volvo's 850 and P80 platforms with transverse mounting. This engine received running changes throughout its production, including the revised PCV system in 1996, creating interchange limits for pre-facelift components. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad on the front of the cylinder block, near the timing belt cover (Volvo Workshop Manual 850/S70). The code will read "B4204S" followed by the serial number. Visually, it is identifiable by its black plastic camshaft cover with "VOLVO" lettering and the absence of a turbocharger. Critical differentiation from the B5254S engine is displacement (2.0L vs 2.5L) and the specific intake manifold design. Service parts require production date verification - PCV system components for engines before 04/1996 are incompatible with later units due to internal redesign (Volvo Service Bulletin 117-1995).
The B 4204 S's primary reliability risk is sludge buildup due to oil trap/PCV system failure, with elevated incidence in high-mileage or poorly maintained examples. Volvo service documentation notes this as a common failure point after 120,000 km, while general owner experience highlights the critical importance of oil quality and change intervals. Extended periods of short-trip driving can accelerate sludge formation, making preventative maintenance critical.
Analysis derived from Volvo technical bulletins (1993-1998) and Swedish Transport Agency historical service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about VOLVO B-4204-S.
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