VW Virtus Fuel Injection Issues Plague Performance

I dealt with very similar symptoms on my 2020 VW Polo TSI. Having some experience with fuel system issues, these symptoms immediately pointed to injection problems. The high petrol consumption combined with power loss and smoke typically indicates faulty injector connections. My workshop did a full system diagnostic scan first, which revealed irregular fuel delivery patterns. They found corroded wiring in the connection between the engine control unit and injectors. The maintenance involved: Complete electrical connection check, Cleaning of all injector plugs, Replacement of damaged wiring, Fuel system pressure test Total repair cost was 95€ and completely resolved the symptoms. The car ran much smoother after, with normal fuel consumption restored. To provide more specific advice for your case, could you share: Engine size and type, Current mileage, Check engine light status, Any recent maintenance work, Whether the smoke is black, white, or blue These details would help determine if your issue matches what I experienced with the faulty connections.

Last serviced at 55000km, and now with 58549km on the clock, my symptoms sound identical to yours, especially the increased petrol consumption and power issues. In my case, the smoke was distinctly blue and the check engine light began flashing intermittently during acceleration. The air intake system was also making unusual whistling noises, which I initially ignored. Before heading to the workshop, I did a basic check for any visible fuel system leaks but found nothing obvious. I am leaning toward booking a diagnostic test since your repair experience seems to match my issues perfectly. Just wondering if your workshop mentioned how long the corroded wiring took to develop? And was there any noticeable warning before the symptoms appeared suddenly?

Those symptoms are indeed very familiar. When I experienced them with my VW Polo TSI, the progression was actually quite rapid. The engine performance issues developed over just 2-3 weeks, starting with subtle power hesitation before quickly progressing to the more serious symptoms. My workshop explained that moisture had gradually infiltrated the wiring connections, accelerating the corrosion process. The whistling noise you mentioned was not present in my case, which suggests your air intake system might need inspection too. This could be related to the injection timing being off due to corrupted signals from the damaged wiring. The blue smoke in your case confirms my suspicion its the same issue, when the injection timing is off, the engine cant properly atomize the petrol, leading to incomplete combustion. This matches exactly what my mechanic explained during my repair. The diagnostic scan in my case took about an hour, and the full repair was completed the same day. Given your mileage is close to when my issues appeared, I strongly suggest getting it checked soon. Continuing to drive with faulty injection signals could lead to more serious engine damage. One key learning from my experience: the corrosion issue was actually preventable with proper inspection during regular service intervals. Make sure your workshop specifically checks these connections during your next service.

Thanks for sharing those details about your repair experience with the VW Polo TSI. The similarities with my Virtus situation are striking, particularly regarding engine performance issues and fuel consumption. I just booked a diagnostic appointment for next week. The maintenance team mentioned they will start with checking the electrical connections and air intake system, based on the whistling noise and performance symptoms I described. My engine is a 1.0L TSI, and fortunately the issue hasnt progressed beyond the intermittent check engine light and blue smoke. The workshop confirmed they can perform fuel system pressure testing and injector connection checks as part of their standard diagnostic process. Really appreciate you mentioning the preventive maintenance aspect. Will definitely request them to inspect all injection system connections during future services to avoid similar issues. Hopefully my repair cost stays around what you experienced, and the engine performance returns to normal after addressing these electrical connection problems.