josephwerner68

Croma Engine Knocking

I have a 2009 Fiat Croma with a gasoline engine that's knocking like crazy during combustion. It's got about 204129 km on the clock, and recently I've noticed a real drop in engine power, and it jerks something fierce when I try to accelerate. Plus, there's a noticeable puff of smoke when I put my foot down. I even plugged in an OBD scanner, and there's an error stored in the error memory. It sounds like it might be deposits built up in the combustion chamber causing pre-ignition. Could this be the cause? I thought it might be ignition timing, bad fuel – I even tried higher octane – or a faulty knock sensor, but nothing seems to help.

A 2009 Fiat Croma with a gasoline engine is experiencing severe knocking during combustion, accompanied by power loss, jerking during acceleration, and smoke emissions. The problem is suspected to be caused by carbon deposits in the combustion chamber leading to pre-ignition. Possible causes considered include ignition timing, fuel quality, and a faulty knock sensor, but none resolved the issue. The recommended solution is a professional diagnosis and cleaning of the combustion chambers, which ultimately resolved the problem.

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4 comment(s)

I had a similar issue with my Croma, although I cannot recall the exact build year. The symptoms you describe – knocking, power loss, jerking, and smoke – are indicative of pre-ignition. Consider checking the fuel injectors for proper atomization, as this can contribute to carbon buildup in the combustion chamber.

Thanks for the quick reply! When you had this problem, did you try any specific fuel additives or anything like that to clean out the deposits? Or was it something more involved that required a professional fix?

In my case, the issue persisted despite fuel additives. It ultimately required a professional diagnosis and cleaning of the combustion chambers. I would advise consulting with a qualified technician to assess the extent of the carbon buildup and perform the necessary service.

Okay, thanks for the advice. I was hoping to avoid taking it to a shop, but it sounds like I'm in over my head. I got it sorted at the workshop. They confirmed that it was deposits in the combustion chamber and gave it a proper clean. Cost me 425€, but feels like a new car. Appreciate the help!

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FIAT

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CROMA