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.
Busso V6 in the Estate — The Most Absurd GTA Variant
An estate with 250 hp Busso V6 and no ESP — emotionally hard to explain, technically identical to the saloon. The Sportwagon GTA is the rarest of all GTA variants and combines the howling six-cylinder sound with a boot that swallows prams and gearbox oil pans simultaneously. Heavier than the saloon, pointless on track, perfect for a Sunday run with the family on board. Rising collector value thanks to extreme rarity.
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 rear spring perch rusts through at the weld seams, which can lead to complete failure of the spring seat. The spring perch can drop onto the tyre and destroy it. Safety-critical — regular visual inspection in the wheel arch is necessary.
Footwell floor and sills rust from the inside outwards. Rust is often concealed by carpet or sill trim covers. Jacking points on the underbody are also heavily affected. Lift the carpet on purchase inspection.
The rear trailing arm rusts through at load-bearing points, affecting wheel alignment. The rear axle body and subframe were fitted without adequate corrosion protection. Safety-critical with advanced rust.
Sill edges, wheel arch transitions, jacking points and underbody rust heavily. Underbody protection peels off early. Internal rust inspection through the ventilation duct in the rear area is recommended.
The water pump typically wears between 120,000 and 175,000 km and should be renewed at the timing belt change. A known silent recall concerns a leaking sealing plug on the coolant pipe. Cost: 350–550 €.
The ABS sensors on the 156 are inadequately protected against water spray. Moisture causes them to fail frequently, activating the ABS warning light.
Upper and lower front control arms reliably wear from 100,000 km. Original parts are sometimes hard to source. Knocking when driving over bumps is the typical sign.
The shared control unit for window regulators, central locking and interior lighting fails regularly. Windows do not respond, central locking is blocked. A fuse reset (pulling the fuse for 10 minutes) is often sufficient. Replacement cost: 50–200 €.
The air conditioning no longer cools as the compressor or its magnetic clutch has failed. Refrigerant is frequently lost through leaking hose connections. Compressor replacement costs 500–900 €, a simple air conditioning service 60–100 €.
The brake discs on the 156 tend to warp and rust heavily, especially after periods of standing. Steering wheel vibrates during braking. Early replacement necessary; repair costs 200–400 € per axle.
The 156 dashboard cracks and deforms with direct sunlight. Seats show early upholstery wear. A typical problem on vehicles from around 100,000 km or after 10 years.
Reports & Tests
The 156 prioritises design and driving dynamics at the expense of long-term durability. Rust sets in noticeably earlier than the class average, and in its eleventh year of operation the corrosion level is considerably above the mean. Diesel engines are prone to turbocharger damage, petrol engines to timing belt failures.