adrianbauer1
Seat Formentor Engine Misfiring
Summary of the thread
The conversation centers around a 2020 Seat Formentor experiencing engine misfiring, characterized by rough running, jerking during acceleration, and reduced power. The initial suspicion is a faulty fuel injector, given the symptoms and mileage. A diagnostic scan is recommended to confirm the misfiring cylinder and inspect the fuel injector. Ultimately, a workshop confirms and replaces a defective fuel injector, resolving the issue.
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4 comment(s)
adrianbauer1 (community.author)
I don't have the equipment to read the error code myself. Fuel consumption seems normal. Spark plugs were changed about 30000 km ago. The rough running is present at all RPMs but seems worse at lower speeds and when the engine is cold.
charlotte_ice81
Given the symptoms and mileage, a defective fuel injector is a strong possibility, especially if the rough idle is persistent across all RPMs and worse when the engine is cold. It's best to get a diagnostic scan to confirm which cylinder is misfiring and then inspect the corresponding fuel injector. Continuing to drive with engine misfiring can damage the catalytic converter. I would advise getting it checked by a qualified mechanic as soon as possible.
adrianbauer1 (community.author)
Thanks. The workshop confirmed a faulty fuel injector. Replaced it, and the engine runs smoothly now. Total cost was 515€.
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FORMENTOR
charlotte_ice81
Engine misfiring can be tricky. Rough idle, jerking, and reduced power definitely point towards a fuel or ignition problem. Since the check engine light is on, did you read the error code? It could give a clue about which cylinder is misfiring. Have you noticed any changes in fuel consumption recently? A faulty fuel pump could also cause similar symptoms, but it's less likely than a fuel injector issue. When was the last time you changed your spark plugs? It's worth checking them too. Does the rough running improve at higher RPMs, or is it consistent regardless of engine speed?