The Chrysler ESG is a 2,499 cc, inline‑four petrol engine produced between 1993 and 1995. It features a cast iron block, aluminum head, and dual overhead camshafts (DOHC) with 16 valves. This engine was designed as a mid-range output variant, delivering 136 hp (101 kW) and 157 lb‑ft (213 Nm) of torque, offering a balance of efficiency and adequate performance for its vehicle class.
Fitted primarily to the Dodge Spirit and Chrysler LeBaron, the ESG was engineered for comfortable daily driving and fuel economy. It utilized multi-point fuel injection and was paired with either 5-speed manual or 4-speed automatic transmissions. Emissions compliance for its production period was met through standard catalytic converter systems, aligning with US federal standards of the early 1990s.
One documented service concern involves premature failure of the distributor drive gear, a known issue across this engine family. This problem, addressed in Chrysler Technical Service Bulletin 18-05-94, is attributed to material wear under sustained load. The ESG shared its core architecture with the higher-output EER and was succeeded by updated engine families featuring distributorless ignition systems.
Chrysler
Production years 1993–1995 meet US Federal Tier 0 emissions standards (EPA Engine Family Number: CCAE2.5L94A).
The Chrysler ESG is a 2,499 cc inline‑four petrol engine engineered for mid-size sedans (1993-1995). It combines DOHC 16-valve architecture with multi-point fuel injection to deliver smooth, reliable power for daily commuting. Designed to meet early 1990s US Federal emissions standards, it prioritized drivability and cost-effectiveness over peak performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,499 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 96.0 mm × 86.0 mm | |
| Power output | 136 hp (101 kW) @ 5,200 rpm | |
| Torque | 157 lb‑ft (213 Nm) @ 3,600 rpm | |
| Fuel system | Multi-point fuel injection (MPFI) | |
| Emissions standard | US Federal Tier 0 | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Timing belt (drives camshafts and distributor) | |
| Oil type | API SH 10W‑30 or 5W‑30 | |
| Dry weight | 365 lb (166 kg) |
The DOHC design provides smooth power delivery suitable for daily driving but requires strict adherence to 60,000-mile timing belt replacement intervals to prevent catastrophic engine damage. The distributor drive gear is a known wear item across this engine family; any signs of ignition misfire should prompt immediate inspection per TSB 18-05-94. Using the specified API SH oil is critical for valve train longevity. The engine's cast iron block offers durability but adds significant weight.
Oil Specs: Requires API SH specification oil (Chrysler Owner's Manual 1994). Modern API SP oils are backward compatible.
Emissions: US Federal Tier 0 certification applies to all 1993-1995 ESG engines (EPA Engine Family CCAE2.5L94A).
Power Ratings: Measured under SAE net standards. Output is consistent across all model applications (Chrysler Powertrain Handbook 1994).
Chrysler Technical Service Bulletin (TSB) 18-05-94
Chrysler Powertrain Handbook (1994 Edition)
EPA Engine Family Database (CCAE2.5L94A)
Chrysler Owner's Manual (Dodge Spirit, 1994)
The Chrysler ESG was used exclusively in Chrysler Corporation mid-size sedans with longitudinal mounting. This engine was the standard 2.5L DOHC variant for the Dodge Spirit and Chrysler LeBaron, featuring unique ECU tuning compared to the base 2.5L SOHC. No licensing partnerships or platform sharing occurred outside these models. All specifications are documented in OEM service literature.
Locate the engine code stamped on a flat pad on the front of the cylinder block, just below the cylinder head and to the right of the timing cover (Chrysler Service Manual 1994). The 8th digit of the VIN will be 'S' for vehicles equipped with the ESG engine. Visually, it can be identified by its black plastic valve cover labeled "2.5 DOHC" and the presence of a distributor on the rear of the cylinder head. Critical differentiation from the EER: The ESG has a lower power output (136hp vs 150hp) and may have a different intake manifold casting. Always verify the engine code stamping, as visual similarities exist with other 2.5L variants.
The ESG's primary reliability risk is distributor drive gear failure, with elevated incidence in high-mileage applications. Chrysler TSB 18-05-94 documents this as a common cause of ignition failure across the 2.5L DOHC family. Neglecting the 60,000-mile timing belt interval poses a severe risk of total engine destruction due to its interference design, making adherence to this schedule critical.
Analysis derived from Chrysler technical service bulletins (1993-1995) and owner-reported data from the Chrysler Historical Society. Repair procedures should follow manufacturer guidelines.
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