Patriot Diesel: Rough Idle & Weak Acceleration Fix

Had similar issues with my 2012 Jeep Compass diesel. The symptoms match exactly what you describe, rough acceleration, weak engine performance, and check engine light staying on. After thorough diagnostics, the issue turned out to be a faulty fuel injector. The defective injector was causing uneven fuel distribution, making the engine run lean and misfire. The mass air flow sensor readings were normal, but the actual problem was with the injection system. This was a serious repair requiring specialized equipment to properly diagnose and fix. The repair involved: Complete injector diagnostic testing, Removing and replacing the defective injector, Reprogramming the engine control unit, Clearing fault codes The symptoms you describe could indicate similar injector issues. Modern diesel engines are sensitive to fuel delivery problems. When one injector fails, it affects the entire combustion process, triggering the check engine light and causing performance issues. Would strongly recommend having a proper diagnostic test done with focus on the fuel injection system rather than immediately replacing the mass air flow sensor or oxygen sensor.

Thanks for sharing your experience. The symptoms do sound very familiar to what I experienced, especially the rough acceleration and check engine light issues. The throttle body and air-fuel ratio were initially suspected in my case too, but it ended up being related to the injectors, just like you discovered. Could you share approximately how much the repair cost in your case? Also curious if youve had any other issues pop up since getting it fixed. Im wondering if problems with the intake manifold or EGR valve sometimes follow these kinds of injection system repairs.

Since getting my Jeep Compass fixed, its been running great with no other injection or fuel delivery problems. The repair bill came to 515 Euro for diagnosing and replacing the faulty fuel injector, which was causing the lean condition. The air-fuel ratio is now perfect and the engine performs smoothly during acceleration. No issues have emerged with the intake manifold or any other components. The original symptoms, rough running, weak power, and check engine light, all disappeared after the injector replacement. I kept a close eye on the oxygen sensor readings after the repair since they can indicate if the engine is running lean again, but everything has remained stable. The mass air flow sensor values also show proper air intake measurements, confirming the fix was successful. This experience showed that accurate diagnostics are crucial, while several components can cause similar symptoms, targeting the actual faulty part (in our cases, the injector) is key to a proper repair.

Finally got my Jeep fixed last week. After reading the suggestions here, I went to a shop that specializes in diesel injection systems. The mechanic hooked up their diagnostic equipment and confirmed the fuel injector was indeed the culprit, just like others experienced. The throttle body and catalytic converter checked out fine, but the faulty injector was causing my air-fuel ratio to be way off. Cost me 490 Euro for the complete repair, including labor. The shop also inspected the EGR valve and other components while they had it apart, which gave me peace of mind. Car runs great now, no more jerking or rough acceleration. The check engine light is off and the engine has its power back. Really glad I asked here before out of nowhere replacing sensors. Having the right diagnosis made all the difference.