josephfischer1
Fortuner engine knocking sound
Summary of the thread
A 2012 Toyota Fortuner with a gasoline engine developed a concerning knocking sound, reduced engine power, jerking during acceleration, and emitted smoke. The issue was suspected to be related to pre-ignition or detonation, possibly due to bad fuel octane. After consulting with others, it was suggested that carbon deposits in the combustion chamber might be the cause. A workshop confirmed this, cleaned the deposits, and resolved the knocking issue.
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4 comment(s)
josephfischer1 (community.author)
Cylinder heads are fine, I think. Deposits in the combustion chamber... interesting. How would I even go about checking for that, and what would cause them in the first place? I'm trying to avoid a costly repair if possible, but this knocking is making me nervous. Is that what you experienced?
harald_beck49
Yes, those were my exact symptoms and that was indeed the cause. I'm no mechanic, but from my experience, I'd say take it to a workshop and have them scoped. If it is deposits, they can advise on the best course of action. It's better to be safe than sorry when it comes to engine knock – you really don't want to risk further damage.
josephfischer1 (community.author)
Thanks for the advice! I took it to the workshop as you suggested. Turns out you were spot on – carbon deposits in the combustion chamber. They cleaned it all out, and the knocking is gone! Cost me 425€, which is better than a new engine, I guess. Appreciate the help!
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TOYOTA
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FORTUNER
harald_beck49
That sounds eerily familiar. I had a similar issue with my old Opel Insignia, although it was a diesel. Same symptoms, the knocking, power loss, even the smoke. Did you by any chance check the cylinder heads? Have you considered that deposits in the combustion chamber may be the cause of this knocking?