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Volvo V50 Misfire

My 2010 Volvo V50 with a gasoline engine has started misfiring at 224521 kilometers. The engine runs rough, the check engine light is on, it jerks during acceleration, and engine power is reduced. I suspect a defective injection valve or fuel injector, but I'm open to other ideas. Has anyone else had similar issues with their Volvo? I've checked the ignition coils, and they seem fine. Any thoughts?

A 2010 Volvo V50 with a gasoline engine began misfiring at 224,521 kilometers, causing rough engine performance, a check engine light, jerking during acceleration, and reduced power. The initial suspicion was a defective injection valve or fuel injector. After considering other possibilities, such as a weak fuel pump, the issue was diagnosed as a defective fuel injector on cylinder four. Replacing the faulty injector resolved the problem, restoring the car's performance.

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4 comment(s)

I had similar symptoms on my old Opel Astra, though it was a diesel. It turned out to be a faulty fuel pump. Have you checked the fuel pressure? A weak fuel pump can cause misfires, especially under load because the engine isn't getting enough fuel to maintain proper combustion. A fuel pump ensures there is adequate pressure of fuel to supply the engine, so the injectors can function properly.

That's a good point. I hadn't really considered the fuel pump. How did you diagnose the fuel pump as the problem in your Astra? Did you just measure fuel pressure, or did you do more?

I simply measured the fuel pressure, and it was significantly below the specified value. At that point, further investigation was unnecessary. I would suggest taking it to a workshop to diagnose. They'll be able to confirm if it's the fuel pump or injectors.

Thanks for the advice. It was indeed a defective fuel injector, specifically on cylinder number four. I replaced it, and the car is now running great. The total cost was 515€, which I think is reasonable.

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VOLVO

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V50