Endeavour Engine Jerking

Greetings. I understand your frustration. Uneven engine running, accompanied by a check engine light and jerking during acceleration, can indeed be quite vexing. The error code stored in the error memory is crucial for diagnosis. I experienced a similar issue with my previous vehicle, a 2014 Opel Insignia. The symptoms were nearly identical: rough idle, engine misfire, and diminished acceleration. In my case, the root cause was a leak in the exhaust system, specifically around the catalytic converter. An exhaust leak can disrupt the air-fuel mixture, leading to inefficient combustion and the symptoms you described. May I inquire if you have inspected the exhaust system for any signs of damage or leaks? Also, have you checked the crankshaft sensor?

Thanks for the reply. I haven't specifically checked for exhaust leaks, but I haven't noticed anything obvious like loud noises. The crankshaft sensor is something I haven't looked at either. How would an exhaust leak cause jerking? And how would I test the crankshaft sensor?

An exhaust leak, particularly before the catalytic converter, can introduce unmetered air into the system, causing the engine control unit (ECU) to miscalculate the appropriate fuel-air mixture. This lean or rich condition can lead to engine misfires and the jerking sensation you are experiencing. The severity of the jerking often correlates with the size and location of the leak. Regarding the crankshaft sensor, its function is to provide the ECU with information about the engine's rotational speed and position. A faulty sensor can result in incorrect timing and fuel delivery, leading to rough running and potential misfires. Testing the crankshaft sensor typically involves using a multimeter to check its resistance and signal output, or an oscilloscope to examine the waveform it generates. However, given the potential complexities involved and the need for specialized equipment, I would recommend consulting a qualified mechanic for a thorough diagnosis and repair. I think you should visit the workshop.

Thanks for the advice. I took it to a workshop, and you were right, it was a leak in the exhaust system! Cost me 265€ to get it fixed. Runs like a dream now.