Smart Roadster dying + smoking: Fuel injection fix needed

Having experienced similar symptoms with my Smart ForTwo 2008, this sounds like a classic fuel system problem. The power loss combined with high consumption and smoke points to faulty fuel injectors or compromised injector wiring. Last repair required thorough diagnostics revealing corroded wiring connections at the injector harness. The system performance was severely impacted because the electrical signals were not reaching the injectors properly. Work involved cleaning connection points, replacing damaged wiring sections, and testing each injector for proper spray pattern. This was classified as a serious repair since bad injector performance can lead to internal engine damage if left unchecked. The repair process confirmed all injectors needed professional ultrasonic cleaning to restore proper atomization. Critical checks included: Fuel pressure testing, Injector resistance measurements, Air intake inspection, Complete fuel system diagnostic scan A certified fuel system specialist is recommended for this type of work rather than a general mechanic. Be sure they perform proper diagnostic steps before replacing parts.

Thanks for sharing that detailed experience. Your symptoms match exactly what I went through with my Roadster last winter. After several maintenance attempts elsewhere, I finally got it sorted with a full fuel system service plus replacing two faulty injectors that were causing the poor performance and excessive smoke. Did you keep track of the total repair cost? And has the car been running fine since the fix? With these particular fuel system issues, I am curious if any other related problems surfaced later.

After getting the injection system repaired, the performance improvement was immediate and lasting. The total cost came to just 95€ for fixing a faulty cable connection at the injector harness, much cheaper than expected. The mechanic found the wiring had worked loose over time, causing inconsistent fuel delivery. The fuel consumption returned to normal levels right away, and the engine runs smoothly at idle now. No smoke issues since the repair either. The system has been trouble-free for over 8 months, with no related problems emerging. This relatively simple fix made such a difference to overall system performance. It proves that sometimes complex-seeming fuel injection issues can have straightforward solutions when diagnosed correctly. Regular maintenance checks would likely prevent similar issues developing in future. From my experience, watching for early warning signs like unusual fuel consumption or power changes helps catch these problems before they worsen. The prompt repair definitely saved money compared to potential engine damage from running with faulty injection.

After your detailed reply, I thought I should share how my repair journey ended. Finally took it to a specialist fuel injection workshop based on your feedback. Turned out three injectors were partially clogged and one had a damaged electrical connection. The mechanic showed me the spray pattern difference between the faulty and good injectors, pretty eye-opening stuff. Total repair came to 380€ including parts and labor. Bit steep but the petrol engine runs like new now. Power is fully restored and fuel consumption dropped back to normal. Best part is no more smoke trails or stalling issues. Really glad I went straight to a specialist rather than wasting more time with general repairs. The diagnostic equipment they used picked up issues my previous mechanic missed completely. Performance has been solid for the past two months with no problems. Proper maintenance schedule is now in place to prevent similar injection problems. Sometimes paying more upfront for expert service saves money in the long run.