Hyundai Gamma

The Hyundai Motor Group's small petrol four, in 1.4 and 1.6 litre forms, and the most widely fitted engine across Hyundai and Kia — the i30, Elantra, Accent, Cee'd, Rio, Soul and Sportage have all carried one. Both port-injected (MPI) and direct-injected (GDI) versions exist under the same family name, and the distinction matters more than the badge does.

On the GDI members, intake-valve carbon is the recurring complaint, because there is no port injection washing the valve, and it presents as a rough cold idle and misfire codes on a car with a clean service history. The MPI versions do not do this at all.

The second theme is the timing chain and its tensioner at higher mileage — a rattle on start-up that precedes any code — and, on some markets and build ranges, oil consumption. These engines are also common in markets with variable fuel quality, where knock-related codes are worth reading as fuel before as sensor.