Wrangler 4xe Power Loss & Stalling Issues Revealed

I had nearly identical symptoms with my 2021 Wrangler 4xe last summer. Based on my some experience with hybrid powertrains, these symptoms immediately pointed to fuel delivery issues. After initial diagnosis, the problem was traced to a faulty fuel injector. The mass airflow sensor readings were fluctuating wildly because the air-fuel ratio was completely off due to the bad injector. This caused the check engine light and the power/acceleration issues you described. The repair cost me 515 Euro for parts and labor. The workshop completed the work in about 4 hours. They also performed a full system diagnostic to ensure no other components like the catalytic converter or intake manifold were affected by the rich fuel mixture. For your case, I would avoid temporary fixes since incorrect fuel delivery can damage other engine components. While waiting for repairs, try to minimize driving if possible. To provide more specific advice about your situation, could you share: Current mileage, Any warning messages besides the check engine light, Whether the issues happen more during cold starts, If youve noticed any unusual fuel consumption, Whether the hybrid system is showing any separate warnings These details would help determine if youre facing the same injector issue or something different.

At 141806 KM and with my last service just completed 2 weeks ago, I suspect its not maintenance-related. The fuel injection system issues you described match my symptoms exactly, particularly the erratic power delivery and rough running. The throttle body was cleaned during my recent service, so I doubt thats causing the rich mixture condition. Your experience with the mass airflow sensor readings makes sense given how my car behaves, especially during acceleration. The 515 Euro repair cost seems reasonable if it resolves all these issues. While waiting for my dealer appointment, I will monitor for any catalytic converter related symptoms, though thankfully I havent noticed any unusual exhaust smells yet. Did you notice any issues with the hybrid system itself during your repairs? Or was it strictly limited to the conventional engine components?

The hybrid system wasnt affected in my case, the issue remained isolated to the conventional engine components. The oxygen sensor readings confirmed the rich mixture problem was solely related to the fuel injection system. Your situation sounds nearly identical to what I experienced, especially since you mentioned the clean throttle body. In my repair, they discovered the faulty injector was causing irregular fuel spray patterns, which explains why the mass airflow sensor readings were so inconsistent. After the repair, my intake manifold was inspected for carbon buildup caused by the rich mixture condition, but fortunately no additional cleaning was needed. The check engine light cleared immediately after the new injector was installed and properly calibrated. Given your mileage is similar to when my issues occurred, and the symptoms match so closely, Id strongly suspect the same root cause. The fact that these problems started after your recent service could be coincidental timing, as injectors can fail gradually before showing acute symptoms. Have you noticed if the engine runs better after warming up? In my case, the cold start symptoms were particularly severe, which helped confirm the fuel delivery diagnosis.

Thanks for breaking down your hybrid system concerns, the parallel with your repairs is really helpful. I can confirm my cold starts are significantly worse, with more severe shaking and an occasional stall that improves once warmed up. Based on the spark plug condition noted in my recent service report, there were no signs of carbon deposits, so hopefully my intake manifold has been spared any damage from the rich fuel mixture. The oxygen sensor readings must be going crazy with these symptoms, which explains the erratic engine performance. I will mention the fuel injector diagnosis to my dealer when I go in. The mass airflow sensor data and air-fuel ratio issues you described match my situation perfectly. For now, I will minimize cold starts and avoid heavy acceleration to prevent any additional strain on the system. The 515 Euro repair cost is much better than I feared. I was worried about potential hybrid system complications, so knowing your repair was contained to just the conventional engine components is reassuring. Will update once I get it fixed.