lindaeule13

Lacetti engine knocking sound

Hey, I'm having a really frustrating issue with my 2008 Chevrolet Lacetti with a gasoline engine. It's got about 60k km on it. Recently, I've noticed a distinct knocking sound coming from the engine, almost like combustion is off. Performance is down, it jerks when I accelerate, and there's even some smoke when I put my foot down. I scanned it and there's an error code stored. I'm suspecting it might be deposits in the combustion chamber causing pre-ignition or something. Anyone else run into this?

A 2008 Chevrolet Lacetti with a gasoline engine developed a knocking sound, reduced performance, jerking during acceleration, and smoke emission. The issue was suspected to be due to deposits in the combustion chamber causing pre-ignition. A similar case suggested using higher octane fuel as a temporary fix, but ultimately, the solution involved cleaning the combustion chamber to remove carbon buildup, which resolved the problem.

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4 comment(s)

I had a similar issue with my Chevrolet Lacetti. Does it seem to be worse when the engine is hot? Try using a higher octane fuel. It helped me for a while. Have you checked your spark plugs recently?

Yeah, it does seem worse when it's warmed up. I've been using regular unleaded, maybe I should try premium. How long did the higher octane fuel help before you needed to do something more?

The higher octane helped for maybe a month or so, but the knocking came back. Eventually, I had to take it to a workshop. They told me it was carbon buildup in the combustion chamber causing detonation. They cleaned it out and it fixed the problem.

Thanks for the info! I took it to my mechanic, and you were spot on. Carbon buildup was the culprit. They cleaned the combustion chamber, and it cost me 425€. Runs like new now!

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CHEVROLET

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LACETTI