Evanda Engine Stalls: EVAP System Warning Signs

Had the exact same symptoms on my '06 Chevy Epica last summer. The stalling and check engine combo pointed straight to emission control system failure, specifically the activated charcoal filter. This part handles fuel vapor recovery and affects the EVAP system's pressure sensor readings. When it fails, the system can't properly manage fuel tank ventilation, leading to those nasty stalling issues at idle. My repair involved: Complete EVAP system diagnostic, Replacement of activated charcoal filter, Cleaning of air flow passages, System pressure test While it's not a critical safety issue, ignoring it can lead to: Continued stalling, Failed emissions tests, Decreased fuel efficiency, Potential fuel system damage The fix wasn't particularly complex, but finding the root cause required proper diagnostic equipment. Would strongly recommend having a certified shop handle this rather than a sketchy mechanic, since proper EVAP system testing is essential for an accurate diagnosis.

Thanks for sharing that info about the charcoal filter, I had almost identical problems with my Evanda last spring. The leak detection showed similar EVAP system issues. Got it fixed at a shop and the stalling completely stopped. Really curious, what did you end up paying for your repair? My system failure ended up involving a few extra parts beyond just the filter. Have you had any other check engine problems pop up since the fix? Been considering doing some preventive maintenance to avoid future pressure sensor issues.

Good to hear you got it sorted! Yeah, getting my Epica's emission control system fixed was straightforward, total bill came to 275 for the defective activated charcoal filter replacement. Money well spent since the fuel tank ventilation leak hasn't given me any trouble since. The check engine light stayed off and no more stalling issues for over a year now. The pressure sensor readings have been spot on, and the air flow through the EVAP system is working like new. Haven't seen any related problems pop up. As for preventive maintenance, keeping the air flow passages clean and having regular pressure tests done during service checks has helped avoid any repeat issues. The system's been running smooth, and fuel efficiency actually improved a bit after the fix. Just make sure you're using a qualified shop that can properly test the EVAP system, those diagnostic tools really make the difference between a proper fix and a band-aid solution.

Thanks everyone for the advice! Just wanted to update on how things turned out. Finally took my car to a certified shop and the diagnosis confirmed what you all suggested, it was definitely the EVAP system acting up. The purge valve was shot and the leak detection test showed some issues with the charcoal canister too. Ended up paying around 340 for the complete fix, bit more than expected but totally worth it. The stalling is completely gone and the check engine light finally cleared up. The mechanic walked me through the whole emission control system repair and showed me exactly what was causing the problems. Best part is the fuel efficiency has actually improved since the fix. No more issues with the fuel tank ventilation, and the engine runs super smooth at idle now. Really glad I didn't go back to that sketchy mechanic who couldn't properly diagnose it in the first place. The whole experience taught me that finding a good shop with proper diagnostic equipment makes all the difference when dealing with EVAP system problems.