Seat Inca Diesel Injection Problem

That sounds like a real headache. Given the symptoms you've described – higher fuel consumption, reduced power, stalling, and smoke – a faulty injection system seems plausible. You mention a potential defective cable or plug connection. Have you checked for any obvious signs of damage or corrosion on the wiring and connectors leading to the injectors? Also, has the engine management light come on at all? If so, have you had the fault codes read? That could give a more specific indication of the problem.

Cheers for the reply. I had a quick look at the connectors, but nothing obvious jumped out. I am no expert though. The engine light is on, I forgot to mention that. I haven't had the codes read yet. Is that something I can do myself, or do I need special equipment? And would a faulty connection definitely cause all those symptoms, including the smoke when accelerating?

Yes, a faulty electrical connection to an injector could certainly cause all those symptoms. The poor connection may result in erratic fuel delivery, leading to incomplete combustion, hence the smoke and power loss. The increased fuel consumption and stalling would also align with such a scenario. While some basic OBD2 readers are available for purchase, a professional diagnostic scan would provide a more thorough analysis. It is recommended to consult a workshop for a proper diagnosis and repair.

You were spot on. I took it to a local mechanic and they checked the cable and plug connections to the fuel injectors. Turns out there was a dodgy connection causing all the trouble. They cleaned it all up, secured the connection properly, and it's running like a dream now. Cost me 95€. Thanks a million for your help.