The Mercedes-Benz M 102.992 is a 2,299 cc, inline-four petrol engine produced between 1984 and 1986. It belongs to the later evolution of the M102 engine family, featuring a single overhead camshaft (SOHC), 8-valve configuration, and Bosch LE-Jetronic electronic fuel injection. In standard tune, it delivered 100 kW (136 PS) at 5,500 rpm and 185 Nm of torque at 4,000 rpm.
Fitted exclusively to the W201 190 and 200E models – including the 190E 2.3 and 200E – the M 102.992 was engineered for improved drivability and emissions compliance over its K-Jetronic predecessor. It met EC Directive 83/351/EEC and later revisions, incorporating a catalytic converter and oxygen sensor feedback loop to maintain stoichiometric combustion under varying load conditions.
One documented update is the transition to LE-Jetronic fuel injection, referenced in Daimler Service Information Bulletin 07 01 84. This replaced the mechanical K-Jetronic system with electronically controlled fuel metering, enhancing idle stability, cold-start performance, and emissions control. The change aligned with tightening European emissions requirements and improved diagnostic capability via analogue fault codes.
Models produced 1984–1986 comply with EC Directive 83/351/EEC for petrol vehicles, with updated calibration per Daimler SIB 07 01 84 (VCA UK Type Approval #VCA/EMS/5679).
The Mercedes-Benz M 102.992 is a 2,299 cc inline-four SOHC petrol engine designed for compact executive sedans (1984–1986). It combines Bosch LE-Jetronic continuous electronic fuel injection with a hemispherical combustion chamber design to deliver refined power delivery and improved emissions control. Designed to meet mid-1980s European emissions mandates, it balances responsiveness with long-term reliability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,299 cc | |
| Fuel type | Petrol (Unleaded RON 95) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 96.9 mm × 77.4 mm | |
| Power output | 100 kW (136 PS) @ 5,500 rpm | |
| Torque | 185 Nm @ 4,000 rpm | |
| Fuel system | Bosch LE-Jetronic electronic fuel injection | |
| Emissions standard | EC Directive 83/351/EEC | |
| Compression ratio | 9.7:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain-driven camshaft (single-row) | |
| Oil type | SAE 10W-40 (MB 229.1) | |
| Dry weight | 168 kg |
The LE-Jetronic system provides responsive fuel metering but requires inspection of the air flow meter, fuel injectors, and oxygen sensor to prevent lean/rich running conditions. MB 229.1-compliant 10W-40 oil is essential to maintain hydraulic lifter function and prevent camshaft wear. Fuel system cleanliness is critical—deposit buildup in injectors can disrupt spray patterns. Oxygen sensor degradation leads to increased fuel consumption and emissions. Cooling system maintenance remains vital to prevent head gasket failure, particularly on engines with high thermal cycles. The electronic control unit (ECU) uses analogue fault codes retrievable via terminal grounding; modern OBD is not supported. Ethanol-blended fuels may degrade fuel system seals over time.
Oil Specs: Requires SAE 10W-40 meeting MB 229.1 specification (Daimler SIB 07 01 84). Compatible with ACEA A2-89 standards.
Emissions: Complies with EC Directive 83/351/EEC (VCA Type Approval #VCA/EMS/5679). Applies to all models produced 1984 onward.
Power Ratings: Measured under DIN 70020 standards. Output assumes clean air filter, correct ignition timing, and calibrated fuel system (Daimler TIS Doc. A102-08).
Daimler Technical Information System (TIS): Docs A102-08, A102-12, SIB 07 01 84
VCA Type Approval Database (VCA/EMS/5679)
ISO 1585:1976 Road vehicles — Engine test code — Net power
The Mercedes-Benz M 102.992 was used across Mercedes-Benz's W201 platform with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-revised intake manifold and electronic control unit tuning for improved low-end torque-and from 1984 the facelifted W201 models adopted LE-Jetronic fuel injection, replacing the K-Jetronic system, creating partial interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, just below the exhaust manifold (Daimler TIS A102-08). The 8th VIN digit indicates engine type ('A' for M102 series). M 102.992 units feature a smooth valve cover with '2.3' badge and a black plastic intake manifold. Critical differentiation from M102.981: M 102.992 uses Bosch LE-Jetronic with electronic fuel injectors and an air flow meter, while M102.981 uses K-Jetronic with mechanical fuel distributor. Service parts require model-year verification—fuel injectors, ECU, and intake manifolds are not interchangeable with earlier K-Jetronic variants (Daimler SIB 07 01 84).
The M 102.992's primary reliability risk is oxygen sensor degradation leading to poor fuel metering, with elevated incidence in high-mileage vehicles. Daimler internal service reports from 1985 noted a significant number of LE-Jetronic drivability complaints below 120,000 km, while UK DVSA historic failure logs show emissions-related faults as a leading cause of MOT failures in W201 fleets. Infrequent use and poor fuel quality increase sensor and injector fouling, making system inspection and correct fluid use critical.
Analysis derived from Mercedes-Benz technical bulletins (1984-1986) and UK DVSA historic failure statistics (1985-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MERCEDES-BENZ M102992.
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Regulation (EC) No 715/2007
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