Hyundai i10 fuel injection issue

The symptoms you have described certainly suggest an issue with the fuel injection system. Higher fuel consumption and reduced power are indicative of an improper air/fuel mixture. When the engine stalls at idle, and you also observe smoke, it points to an imbalance where there's either too much fuel or not enough air. Have you checked the electrical connections to the fuel injectors? Are they firmly attached, and is there any corrosion present?

Thanks for the quick reply. Electrical connections to the injectors... hadn't thought that specific. When you say 'electrical connections', are we talking about the plugs themselves, or further up the wiring loom?

By electrical connections, I am primarily referring to the plugs that connect directly to the fuel injectors. Like a kink in a garden hose restricting water flow, a faulty connection can disrupt the optimal fuel delivery. If these connections are compromised, it can lead to erratic engine behavior. Given the potential complexity, consulting a qualified workshop might be the most prudent course of action.

Appreciate the confirmation. Turned out to be a dodgy plug on one of the injectors, exactly as you suggested. New connector and a bit of contact cleaner sorted it. Cost me 95€ all in. Thanks for pointing me in the right direction.