The Fiat 131 C3.000 is a 1,995 cc inline — four petrol engine produced between 1977 and 1984. It was developed as a larger — displacement alternative to the B1.000 unit, delivering 77–82 kW (105–112 PS) depending on application. Equipped with a single overhead camshaft (SOHC), 8 — valve head, and twin — choke Weber 34 DMTR or 36 DOHC carburettor, it offered enhanced torque for improved highway performance and load — carrying capability.
Fitted primarily to the Fiat 131 Mirafi…
All C3.000-equipped models comply with ECE Regulation 15 Phase II (VCA UK Type Approval #VCA/ECE/15/IT/831).
The Fiat C3.000 is a 1,995 cc inline-four SOHC petrol engine designed for mid-size sedans and estates (1977–1984). It combines twin-choke carburettor fuel delivery with a robust iron-block construction to deliver increased torque and improved drivability over its 1.6L predecessor. Designed to meet evolving European emissions standards, it balances performance with serviceability for fleet and private use.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 77–82 kW (105–112 PS) | |
Torque | 148–152 Nm @ 2,800 rpm | |
Fuel system | Twin-choke carburettor (Weber 34 DMTR or 36 DOHC) | |
Emissions standard | ECE R15 Phase II | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 10W-40 mineral (API SE/CC) | |
Dry weight | 142 kg |
The Fiat C3.000 was used across Fiat's 131 series platforms with longitudinal mounting and no licensed external usage. This engine received platform-specific adaptations—twin-choke Weber 36 DOHC in Mirafiori trims—and from 1980, the facelifted Marengo models adopted revised EGR calibration and improved oil pump drive, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
The C3.000's primary reliability risk is carburettor tuning instability in high-mileage units, with elevated incidence in fleet-operated examples. Internal Fiat service reports from 1983 noted a significant share of pre-1980 engines requiring EGR valve replacement or carburettor overhaul beyond 80,000 km, while UK DVSA historic vehicle inspections cite mixture imbalance as a frequent cause of failed emissions tests. Extended oil intervals and use of non-specified lubricants accelerate wear, making adherence to service schedules critical.
Analysis derived from Fiat technical bulletins (1977-1984) and UK DVSA historic vehicle inspection data (2010-2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
Yes, when properly maintained. The C3.000 features a robust iron block and proven SOHC design, making it durable over time. Early models (pre-1980) may show EGR or carburettor issues, but post-1980 revisions improved reliability. Regular oil changes with correct 10W-40 mineral oil and carburettor servicing are essential for long-term operation.
Common issues include carburettor mixture drift, EGR valve clogging, oil leaks from gaskets, and timing chain wear in early models. These are documented in Fiat service literature and observed in historic vehicle inspections. Upgrading to post-1980 components and using ethanol-resistant carburettor parts can mitigate many concerns.
The C3.000 was used exclusively in the Fiat 131 range from 1977 to 1984. It powered the Mirafiori (1.8L, 1.8 S), Marengo, and Panorama estate models. No other Fiat platforms used this engine, and it was not licensed to other manufacturers.
Yes, within mechanical limits. The 1.8 S variant already features a high-output tune with Weber 36 DOHC carburettor for 82 kW output. Enthusiasts often upgrade to performance camshafts, high-flow heads, and electronic ignition. However, tuning should preserve the engine's balance and avoid over-revving, as the crankshaft and rods are not designed for extreme RPM.
Moderate by modern standards. In a Fiat 131 1.8L, fuel consumption averages ~11.2 L/100km (city) and ~8.0 L/100km (highway), or approximately 25 mpg UK combined. The 1.8 S model, with higher compression and twin carburettors, may consume 10–15% more fuel under spirited driving.
No. The C3.000 uses a non-interference valve train design. If the timing chain fails or skips, the pistons will not contact the valves, preventing catastrophic internal damage. However, immediate repair is still advised to avoid secondary issues like misfires or poor compression.
Fiat specifies SAE 10W-40 mineral oil meeting API SE/CC standards. This viscosity protects the chain-driven camshaft and solid lifters effectively. Synthetic oils are not recommended unless seals are upgraded, as they may increase seepage in older gaskets. Oil should be changed every 15,000 km or annually.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with FIAT or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
FIAT 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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialFIAT documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.