RSQ3 Engine Stalling & Misfiring Due to Fuel System

Last month I dealt with nearly identical symptoms on my 2018 Audi RS3. The rough idling and stalling were classic signs of a failing high pressure fuel pump. Car sensors detected inconsistent fuel pressure, triggering persistent check engine warnings. The high pressure pump failure is a serious issue that requires immediate attention, as it can lead to complete engine failure if ignored. When the fuel injection system cannot maintain proper pressure, it causes misfires and performance issues, especially noticeable during warm operation. My repair required complete replacement of the high pressure fuel pump assembly and recalibration of the fuel injection system. The job took three days at the shop due to the complexity of accessing and testing the complete fuel delivery system. For proper diagnosis, ask specifically for: Fuel pressure testing, High pressure pump electrical testing, Fuel injector spray pattern analysis, Full diagnostic scan focusing on fuel system parameters This issue requires specialized knowledge of Audi fuel systems. Regular mechanics often misdiagnose it as simpler problems like fuel regulators or injectors. Look for shops with Audi factory diagnostic equipment and certified technicians who regularly work on direct injection systems.

Thanks for sharing your experience with the fuel system issues. Your situation sounds exactly like what I went through with my RSQ3. The automotive repair shop finally traced it to the high pressure pump too after multiple failed attempts at fixing other components. The proper car maintenance and diagnosis made all the difference. Would you mind sharing what the total repair cost was for your case? Just wondering how it compares, since my mechanic initially misdiagnosed the rough idling as a simple fuel regulator problem. Also, has everything been running smoothly since the repair, or have you noticed any other check engine warnings?

After my last update about the high pressure pump replacement, everything has been running perfectly. The automotive repair shop did an excellent job fixing both the fuel regulator and pump issues. Total cost came to 1510 Euro for the complete repair job, including parts and labor. The engine misfire problems completely disappeared once they correctly diagnosed and replaced the faulty components. No more check engine lights or power issues since then. Car maintenance records show the repair was definitely worth the investment, considering how the initial misdiagnosis just focused on the fuel regulator alone. Proper car diagnostics made all the difference. The idle is now smooth, acceleration is responsive, and fuel consumption has actually improved. This kind of repair requires specialized knowledge, but getting it done right the first time saves money in the long run. It has been 3 months since the fix, and I can confirm there have been zero issues with the fuel system or engine performance. The car runs like new again.

After dealing with the stalling and rough idling issues, I finally got everything sorted with my RSQ3. The fuel injection system is now working perfectly after finding a specialist who properly diagnosed the high pressure pump failure. Total repair came to 1650 Euro, which included the new pump, labor, and complete system diagnostics. The automotive repair took about 4 days, but it was worth the wait. My previous mechanic wasted time checking the fuel regulator and other basic components, charging for unnecessary work. The new shop immediately identified the real problem using proper diagnostic equipment. Since the repair, fuel economy has improved significantly and the car feels more responsive than ever. No more check engine lights or performance issues. Regular car maintenance will be crucial going forward, but at least now I know which shop can properly handle these specialized Audi fuel systems. Definitely learned my lesson about finding the right specialist rather than trying to save money with general repair shops that lack proper diagnostic tools and experience.