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Laguna engine knocking

Renault Laguna owners! My 2006 Laguna with a gasoline engine is playing up big time! It's got 210501 km on the clock and recently started knocking like crazy during combustion. I'm losing power, it's jerking when I accelerate, and puffing out smoke too! The error memory is also showing a stored error. I'm guessing it could be deposits in the combustion chamber, but I'm no expert. Anyone else had this?

A 2006 Renault Laguna with a gasoline engine is experiencing severe knocking during combustion, loss of power, jerky acceleration, and smoke emission. The issue is suspected to be caused by deposits in the combustion chamber, possibly due to using low-octane fuel. The suggested solution is to have the vehicle checked at a workshop, where it was confirmed that the problem was indeed due to combustion chamber deposits, which were successfully resolved.

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4 comment(s)

Sounds familiar! I've got a Laguna too, and I had similar symptoms a while back. Reduced power, jerky acceleration, and smoke…yep, sounds like my old problem. Have you checked around the cylinder heads or considered detonation? Do you know if it could be piston slap, or if the right fuel octane is used?

Cylinder heads and detonation, eh? Piston slap? Right fuel octane? Okay, you're speaking a whole different language here, LOL! How bad was it for you and how did you fix it? I'm a bit clueless when it comes to the nitty-gritty. Any idea what the fuel octane could be?

Alright, no worries! In my case, it turned out to be carbon buildup in the combustion chamber itself, most likely caused by some cheap fuel I used for a while. If the fuel octane is too low, premature detonation can happen, so using the correct one is vital. But to be honest, with those symptoms, especially the knocking and smoke, you're better off getting it checked properly at a workshop. I tried a few things myself, but nothing really sorted it out for long-term! Don't want to make it worse, eh?

Cheers for the advice! Workshop it is then! I took it in, and you were spot on – it was deposits in the combustion chamber. Cost me 425€ to sort out, but she's running sweet as a nut now. Appreciate the help!

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RENAULT

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LAGUNA