Alfa Romeo 1.8 TS
The 1.8-litre Twin Spark produces 140 hp and sits between the mild 1.6 and the characterful 2.0 — a good all-round compromise. Same Twin Spark technology with twin spark plugs, same rev temperament to 6,500 rpm. In the GTV and Spider the engine sounds more characterful than in the closed 156 cabin. Phaser susceptibility lower than the 2.0, timing belt change identical at 60,000 km. Consumption moderate (8–10 l/100 km), power adequate for daily use.
Light Coupe with Love of Revving
In the GTV the 1.8 TS shows its best side: nimble, eager to rev, with the crisp wedge-shape coupe body as a visual bonus. Genuine driver's fun.
Engine Weaknesses 8
Alfa originally recommended 120,000 km and shortened the interval several times to 60,000 km or 5 years. Belt failure causes total engine destruction through piston-to-valve contact.
Symptoms: No warning — engine suddenly refuses to start or loud crack on belt failure
The O-rings of the oil galleries between head and block (perbunan) swell and deform when exposed to engine oil. Cylinder 4 is particularly affected: coolant enters the oil, visible as milky emulsion on the oil filler cap.
Symptoms: Milky residue on oil filler cap or dipstick, coolant consumption without external leak, white smoke from exhaust on a warm engine.
Insufficient oil supply (missed oil changes, oil loss) leads to con-rod bearing failure. The crankshaft then needs to be reground/polished. Repair costs €700–1,000 for machining plus bearings; severe damage requires engine replacement.
Symptoms: Loud knocking or hammering from engine (especially under load), oil pressure warning light, noticeable power loss.
The camshaft phaser tends to stick. Rough running and power loss result.
Symptoms: Rough idle, power loss, harsh throttle response
Thermostat fails to open reliably, coolant loss through a leaking water pump. The pump's plastic impeller can break and interrupt coolant circulation. Recommendation: always replace water pump during timing belt change.
Symptoms: Temperature gauge fluctuates or rises above 110 °C, coolant level drops without visible external leak, cooling fan runs unusually often.
From approx. 150,000 km the valve stem seals harden. Oil consumption of 0.5–1 l/1,000 km and blue smoke on cold start are typical.
Symptoms: Blue smoke on cold start, increased oil consumption, faint oil smell
The throttle body potentiometer's contact tracks wear out and supply incorrect signals to the engine ECU. Result: unstable idle, poor throttle response. Cleaning helps; relearning via OBD is required.
Symptoms: Rough or fluctuating idle between 500–2,000 rpm, engine hunts after cold start, vehicle jerks on throttle lift-off.
Lambda sensors have a lifespan of approx. 100,000 km. A worn sensor delivers incorrect mixture control, the engine runs rich, and fuel consumption rises sharply. Often misdiagnosed as an ignition problem.
Symptoms: Significantly increased fuel consumption (15–20 l/100 km), rough idle, engine management light, fault code P0170/P0172 (mixture too rich).
Vehicle Weaknesses 7
Weld seams on longitudinal members, engine bay crossmember and strut tops corrode. Underbody steel structures have no adequate protection — especially weld points on the tunnel area and rear wheel arches are affected. Extensive restoration required when heavily rusted.
The manual gearbox on the GTV shows synchromesh wear at higher mileage. Difficult engagement of certain gears is a typical symptom. Gearbox overhaul costs several hundred to over a thousand euros.
Rust forms preferentially at underbody weld seams, inner wheel arches and fuel tank guard. Underbody protection lifts off and releases moisture. Rear wheel arch inner panels and tunnel seams are particularly affected.
Blocked drain channels in the scuttle panel below the windscreen direct rainwater into the footwell. Leaves and dirt block the drain pipes. In heavy rain, water runs into the passenger footwell blower.
The air conditioning condenser sits directly in the line of stone impacts in front of the radiator and is frequently damaged. Refrigerant also escapes through normal leakage after 3–4 years. Condenser replacement including recharge costs approximately 500 €.
Electric windows fail through failed motors or control units. Plastic drive components break; switches and relays become brittle. When both sides fail simultaneously, the relay under the boot carpet is often to blame.
Power steering pressure lines become porous and leak at connectors. On the V6 the line runs in a hard-to-reach location under the air filter and radiator. Fluid loss continues without repair.