The timing-chain tensioner is the fault that defines the EA888's reputation. On the Gen 1 and early Gen 2 EA888 (roughly 2008–2014 — the Mk6 GTI's CCTA/CBFA and the early 2.0T family), the tensioner can bleed down and let the chain go slack, most often on a hot restart or at shutdown.
Symptoms:
- A rattle or grinding for a second or two on start-up — the classic warning, cold or hot.
- A metallic chain slap at idle on a worn one.
- Worst case, the chain jumps a tooth and the engine loses timing — on an interference engine that means bent valves and a big bill.
The fix:
- VW released a revised tensioner that supersedes the original — fitting it is the cure. Do it at the first rattle, not after.
- If the chain, guides or sprockets are worn, do the full chain kit while you're in there. The tensioner sits at the back of the engine (flywheel end), so access is labour-intensive.
Which engines: the Gen 3 EA888 (2015+, Mk7, CXCB/CHHB) revised the design and is far less prone — but listen to a high-mileage one anyway.
Bottom line: a start-up rattle on an EA888 is not "just cold-engine noise" — it's the tensioner, cheap to fix versus catastrophic to ignore. See EA888 Water Pump Thermostat and VCDS Basics.