StefGross19

Siena Cylinder Pressure Fluctuation

I'm having some issues with my 2016 Fiat Siena, diesel engine. It's got 217805 km on the clock. Lately, I've noticed cylinder pressure fluctuation, causing higher fuel consumption and a noticeable reduction in engine power. The check engine light has also come on. I've checked the basics like air filter and spark plugs, but I'm not sure where to go from here. Any ideas?

A 2016 Fiat Siena with 217,805 km is experiencing cylinder pressure fluctuation, leading to increased fuel consumption and reduced engine power, along with an illuminated check engine light. Initial checks of the air filter and spark plugs did not resolve the issue. A suggestion to inspect the fuel injectors revealed they were the cause of the problem, and the repair was covered by a recall, resolving the issue at no cost.

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4 comment(s)

Cylinder pressure fluctuation on a diesel can be tricky. I had a similar issue with my old Peugeot. Have you checked the fuel injectors? A faulty injector can cause uneven cylinder pressure and trigger those symptoms.

Thanks for the tip! Fuel injectors... That's something I haven't considered yet. Were the symptoms exactly the same with your Peugeot? And did the check engine light come on?

Yes, the check engine light illuminated, and the symptoms were quite similar. Given the potential complexity, I would advise seeking professional diagnosis. It could be a consequential error from another error. Best to get it checked properly.

Thanks for the advice! I took it to a mechanic, and you were right – it was a fuel injector issue that was causing the misfire. Apparently, the repair was covered by a recall I didn't even know about, so it cost me 0€! Thanks again!

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FIAT

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SIENA