Alfa Romeo 1.7 TBi
The only 1750 TBi with an aluminium block — 22 kg lighter than the cast iron version in the Giulietta and Brera. Mid-mounted transversely behind the seats in the carbon monocoque (65 kg tub weight). Turbo throttle response has two faces: below 2,300 rpm there is a noticeable pause, above 2,500 rpm strong push through to 240 hp. The sound is surprisingly raw and aggressive for a turbocharged four — the mid-engine position with no insulation between engine and driver lets every load change be felt directly in the back. No power steering: parking is a workout, at speed the feel is surgically precise. The TCT dual-clutch gearbox shifts acceptably sharply in Dynamic mode, occasionally jerky in Normal mode at crawling speeds.
895 kg Carbon Mid-Engine — the Most Radical Alfa Ever Made
The 4C Coupe is Alfa's most uncompromising production car: carbon monocoque, mid-engine, no power steering, under 900 kg kerb weight. The 1750 TBi sits directly behind your ears and barks hoarsely through the rev range — not naturally aspirated howl, but more intense than any front-engined car thanks to the absent sound deadening. The steering without servo filters nothing: every road imperfection, every near-limit signal arrives unfiltered. The front axle goes light above 200 km/h — not a motorway car, a country road tool. 4.7 seconds to 100, but the speed feels twice as fast.
Engine Weaknesses 9
The turbo oil feed line runs unprotected next to the exhaust manifold. Oil cokes up and the filter strainer becomes blocked — turbo oil starvation results. From late 2013 an improved line with heat shielding was fitted.
Symptoms: Oil vapour from the engine bay, turbo whine/grinding, power loss, oil loss at the turbocharger.
Interference engine with timing belt drive. Belt breakage causes piston-valve collision — total engine destruction. Replace every 100,000 km or 5 years, always with water pump and tensioner. Several tensioner failures are documented.
Symptoms: No warning until belt failure. Verify last replacement history before purchase — mandatory.
The vacuum pump mounted on the end of the camshaft can damage the camshaft through oil starvation if the seal fails. In the worst case, the dry-running pump destroys the camshaft bearing; costly engine damage is the result.
Symptoms: Oil loss around the vacuum pump area, oil smoke from the engine bay, loss of brake booster pressure
A torn or sludged crankcase vent membrane directs oil mist into the turbocharger — which then grinds itself to destruction. Classic diagnostic error: the failed turbo is replaced while the cause remains. A second turbo failure follows within 35,000 km.
Symptoms: Oil mist from the crankcase vent hose, turbo howling, power loss with boost pressure below 0.7 bar, bluish smoke when accelerating.
The TCT hydraulic system loses pressure over time through ageing O-rings in the quick-connect couplings. The clutch position sensor and hydraulic fluid level are the primary causes. Clutch replacement requires engine removal (3 days work). Mechatronics replacement in extreme cases up to 13,000 €.
Symptoms: Gearbox does not engage / drops to neutral, heavy judder on downshifts, gearbox fault message, burning smell after spirited driving.
The rubber PCV membrane hardens over time. Engine oil enters the intake tract and oil consumption rises noticeably. Inexpensive preventive replacement every 10 years is recommended.
Symptoms: Elevated oil consumption (>0.5 L/1,000 km), faint blue smoke on cold start, oil film on the airbox.
The mid-engine layout places heavy demands on the hydraulically damped engine mounts. Fluid-filled upper mounts lose their damping with age and aggressive driving. Powerflex bushes are a popular upgrade.
Symptoms: Vibration at idle, dull thudding under load changes, fluid leakage on the underside.
The OEM hose between the turbocharger and intercooler runs directly next to the downpipe and deteriorates from the heat. From around 80,000 km, internal pieces break free, blocking airflow or causing whistling under load.
Symptoms: Whistling or hissing under full throttle, noticeable power loss, occasional boost pressure fault in fault memory.
The stock intercooler in the enclosed engine bay overheats after a few full-throttle runs. The ECU reduces boost pressure as a protective measure. Not a defect, but a design limitation under sporty use.
Symptoms: Noticeable power drop after repeated acceleration runs, especially at ambient temperatures above 25 °C.
Vehicle Weaknesses 9
The Alfa TCT dual-clutch suffers from clutch wear and mechatronics corrosion at connectors. Clutch replacement requires complete engine removal (3 working days). Early build years 2013–2015 are most affected.
Front wishbone rubber bushes harden and crack relatively early, especially with everyday use and in wet conditions. In 2014 there was a hidden recall (Pit Stop Programme) including a geometry correction.
BCM/ECM/TCM react sensitively to voltage drops. A weak battery or corroded connectors on the transmission control unit trigger multiple warning lights simultaneously. Often not a genuine fault.
The stock suspension is the most frequently cited weakness: nervous over ruts, steering wheel snatched at high speed, no rear anti-roll bar as standard.
Early 4C models (up to 2015) have a boot liner made from laminated carpet material that absorbs water. Later production received a sealed plastic tray.
The fastening points between the carbon monocoque and the suspension carriers work loose over time. Alfa specifies periodic inspection by certified workshops.
The drain valve in the drainage channel sticks with temperature changes. Condensation accumulates inside the headlight. Most common 4C defect in the UK. Warranty replacements were widespread.
Glass-fibre-reinforced SMC plastic body panels have a soft paint surface. Stone chips immediately expose grey primer. Red paint finishes are particularly susceptible. Paint protection film (PPF) on the front is worthwhile.
Leather-trimmed dashboard and door panels show delamination. Direct sunlight significantly accelerates the process.
Reports & Tests
1 owner complaints filed with NHTSA (2013–2020). Most reported: Engine (1).