VW Golf
First stratified direct injection engine in the group. Carbon deposits on intake valves are known. High-pressure pump can fail. Moderate long-term reliability.
FSI, but No Fireworks
The BAD FSI runs cleanly and economically but doesn't deliver overwhelming power. Sensible, not stirring.
Engine Weaknesses 5
The 1.6 FSI suffers from premature timing chain stretch, audible as metallic rattling on cold start. A coked chain tensioner from long oil-change intervals makes the problem worse.
Symptoms: Metallic rattling on cold start for a few seconds, reduces after warm-up
As a pure direct-injection engine, oil vapour from the crankcase ventilation deposits as soot on the intake valves. FSI engines without port injection are particularly susceptible to valve coking.
Symptoms: Poor throttle response especially when cold, rough idle, increased fuel consumption
The 1.6 FSI tends to combustion misfires at a lean idle mixture, manifesting as juddering and diesel-like knocking. The cause is the FSI system's mixture formation at low loads.
Symptoms: Knocking noise at idle similar to a diesel engine, juddering, vibrations felt through pedals and steering wheel
Hydraulic valve lifters and the camshaft adjuster can become clogged with oil deposits from long oil-change intervals. The result is delayed oil actuation and rattling noises.
Symptoms: Rattling on cold start that fades as oil temperature rises; rough warm-up running
Two different coolant regulator housings were fitted to the BAD engine. After engine replacement or repair, the correct housing must be used, as incompatibility causes coolant blockage.
Symptoms: Overheating warning, engine fails to reach or reaches incorrect operating temperature, coolant loss
Vehicle Weaknesses 12
In early Golf IV models up to July 2001 with 1.4- and 1.6-litre petrol engines and the 1.9 SDI, an undersized rivet in the manual gearbox could shear, causing abrupt gearbox failure. VW carried out a service action.
Full galvanisation provides good protection, but dirt and moisture collect under the plastic inner wing, leading to rust at the cut edges of the sill ends and front wheel arch edges.
The rubber bearings of the Golf IV's torsion beam rear axle go brittle and crack over time. Worn bushings lead to significant suspension defects at MOT and cause clunking on poor road surfaces.
The handbrake mechanisms integrated into the rear brake calipers of the Golf IV corrode when neglected and seize. The brake pistons can then no longer be wound back. Replacing both calipers plus discs is often necessary.
The shaft seals in the power steering rack of the Golf IV go porous and leak hydraulic fluid. Individual seals are not available as spare parts; the complete steering rack must be replaced.
The plastic guide rail of the electric window regulator breaks through material fatigue. The window pane then drops uncontrolled into the door. VW offered a repair kit with a metal rail that permanently solved the problem.
The vacuum-operated central locking of the Golf IV fails frequently due to a defective vacuum pump or cracks in the vacuum lines. The ECU and microswitches in the doors are also known weak points.
The ribbon cable in the Golf IV instrument cluster loses its adhesive contact over time. Rows of pixels disappear gradually from the MFA or FIS display, usually when warm. A cheap repair is possible.
The control arm bushings of the Golf IV front axle wear — partly due to insufficient dimensioning for the vehicle weight — sometimes as early as 40,000 km. VW improved the components during production; early models are more affected.
The A/C compressor and condenser of the Golf IV are susceptible to failure and leaks after long standstill or at high age. When replacing the compressor, the dryer must always be changed too to avoid consequential damage.
The original plastic holders on the electric window regulators in the Golf 4 (1J) break reliably. VW used weaker plastic clips instead of the metal brackets from the predecessor. Affects approximately 50% of older Golf 4 examples. Repair kits with metal brackets available.
Almost all Golf 4 examples develop a sticky soft-touch coating on the dashboard and controls over time. The thinly applied rubber paint dissolves, leaving black smears on clothing and looking very unsightly.