Alfa Romeo 3.2 V6 GTA
The last true Busso V6 — 3,179 cc, 60-degree bank angle, DOHC 24V with variable intake. The irregular firing interval of the 60-degree V6 creates the layered, multi-voiced sound that makes the engine the 'Stradivarius among six-cylinders'. The engine only really wakes up above 4,500 rpm — then it howls to 7,200 rpm with a sound no other production six-cylinder can reproduce. 300 Nm only at 4,800 rpm: not an engine for the lazy-shifting. 10W-60 oil is mandatory without exception — thinner oils deliver insufficient pressure to the chain tensioners. Three timing chains (one primary, two secondary), no belt. Chain kit hard to source, replacement only possible with engine removed. With conscientious maintenance, 300,000+ km is achievable — documented examples with over 400,000 km exist.
250 hp Busso V6 in a Compact — Too Much Engine, Just Right
The 147 GTA has the shortest wheelbase of all GTAs and the most direct steering: 2.25 turns lock to lock. 250 hp Busso V6 on the front axle without a limited-slip diff — in the wet a constant battle for traction, in the dry an adrenaline machine. The engine is really too big and heavy for the car, and that's precisely the appeal. From 5,000 rpm the Busso wails from directly behind the dashboard, the short wheelbase makes the rear nervous under throttle lift-off. Not a car for relaxed cruising — a car for people who want to work when they drive.
Engine Weaknesses 10
The timing chain of the 3.2 V6 (successor to the Busso in the 147/156 GTA) tends to rattle on cold starts from around 80,000 km. Parts availability is limited.
Symptoms: Metallic rattle on cold start that diminishes or persists after warm-up
The Busso V6 timing belt must be changed every 5 years or 96,000 km. If it breaks, instant engine destruction follows through valve failure — no interference-engine buffer. Many used examples have no documented service history for this interval.
Symptoms: No warning. Engine dies abruptly while driving. Starter spins without compression.
The paper gasket between the intake manifold and throttle body ages and tears — air leaks lead to hot combustion that can, in extreme cases, burn valves or melt holes in the piston crown. A gradual process.
Symptoms: Unstable idle, poor throttle response, power loss in upper rev range. In extreme cases, misfires.
The crankcase ventilation membrane valve freezes in extreme frost and draws oil into the intake tract. On the 2.4 JTD 10V the problem is identical to the 1.9 JTD. Replacement parts are available for the Alfa 156 and 166 with 2.4 JTD.
Symptoms: Heavy oil smoke after cold start in frost, crankcase pressure build-up, oil film in the air filter area
The EGR cooler on the 2.4 JTD corrodes internally and allows coolant into the exhaust path. This mimics a blown head gasket. Bypassing the cooler by directly connecting the coolant hoses is a common workaround.
Symptoms: White smoke briefly after cold start, slowly dropping coolant level without visible external leak, no oil-water mix in the expansion tank
The crankshaft position sensor on the 2.4 JTD is prone to failure or contact corrosion at the connector. When the sensor fails, the ECU cuts fuel delivery. The fault usually lies in the connector plug, not the sensor itself.
Symptoms: Sporadic engine cut-out without warning, warning light, engine fails to start, occasional stumbling at low revs
The TDC sensor (crankshaft sensor) fails due to heat from around 90,000 km. Engine dies in warm weather and restarts after 15–20 minutes of cooling. No fault code stored — older ECUs do not detect the failure.
Symptoms: Engine cuts out without warning in warm conditions, no restart possible, after 15–20 min cool-down engine starts normally. Fault memory remains empty.
Oil consumption on the GTA is normally minimal (0.2 L between oil changes). With spirited driving, consumption rises noticeably. Cause: hardened valve stem seals or worn piston rings at high mileage. 10W-60 oil is mandatory.
Symptoms: Oil level drop, blue smoke under load
The rear lambda sensor (bank 1) ages earlier than the front sensor as it is exposed to higher exhaust temperatures. Incorrect readings cause the ECU to inject an overly rich mixture, leading to elevated fuel consumption.
Symptoms: Engine warning light, noticeably increased fuel consumption (+2–4 L/100 km), faint fuel smell after cold start
The plastic coolant crossover pipe becomes brittle with age and starts to seep. Replace preventively at every timing belt service. Not an acute emergency, but uncontrolled coolant loss leads to overheating.
Symptoms: Faint coolant smell after switching off, dropping coolant level, occasional overheating indication in traffic jams.
Vehicle Weaknesses 11
The V6 3.2 ECU is heat-sensitive and can fail at high ambient temperatures. Engine cuts out suddenly and only restarts after 15–20 minutes of cooling. No fault code stored.
The stock differential in the GTA gearbox can break under load — a bevel gear detaches and punches through the bell housing. Often without warning. A Q2 limited-slip differential is the recommended upgrade.
Early 147 GTA models have 305 mm Brembo discs instead of 330 mm. Alfa upgraded them to 330 mm under warranty. Unupgraded vehicles are prone to brake fade during spirited driving.
Sill lower edges and wheel arches rust from stone chips and moisture ingress. Areas around the jacking points are particularly at risk, where the plastic trim traps moisture.
Joints, bushes and anti-roll bar drop links on the front axle wear above average. Renewal typically required every 100,000–150,000 km. Plan for a suspension refresh at higher mileage.
The 305 mm braking system on the GTA is undersized for the 250 hp and wears heavily. Brake discs and pads must be renewed significantly more often than on regular 147 variants.
Window regulators and central locking fail from moisture ingress and aging control units. Door handles break. Airbag connectors on the side airbags can come loose.
On the Alfa 147 the air conditioning seals age and cause permanent refrigerant loss. Engine oil leaks from the timing belt can spray onto the compressor and cause additional damage. Compressor replacement: 400–900 €.
The 147 heater stays cold or delivers only lukewarm air, especially at idle. A blocked heat exchanger or air pockets in the system are the usual cause. Blend flap motor faults (often failed bulbs in the climate control unit) are also possible.
The Alfa 147's duplex power steering lines are prone to leaks, causing knocking and heavy steering. A leaking right-hand power steering pressure hose is known. Part cost approximately 100 €, fitment 1.5 labour hours. Steering play is not adjustable.
The 147 interior produces cold-weather creaking from trim panels and seat springs. On cold winter start-ups, seats and door trims squeak and crack. A typical quality issue on vehicles over 8 years old.