henry_loewe1

Seat Exeo knocking combustion issue

I am having a perplexing issue with my 2009 Seat Exeo (gasoline engine). Experiencing what I believe is knocking combustion, exhibiting as reduced engine power and jerking during acceleration. There's also noticeable smoke during acceleration. The error memory stores related errors, but nothing definitive. My suspicion leans towards deposits in the combustion chamber, possibly leading to pre-ignition or even piston slap under load. I've checked the usual suspects (spark plugs, air filter), but the problem persists. Thoughts?

The 2009 Seat Exeo is experiencing knocking combustion, leading to reduced engine power, jerking during acceleration, and noticeable smoke. The suspected cause is deposits in the combustion chamber, potentially leading to pre-ignition or piston slap. Suggested solutions include checking ignition timing and addressing carbon buildup on piston and cylinder heads. Ultimately, a professional cleaning of the combustion chamber resolved the issue, restoring engine performance.

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I also drive a Seat Exeo, and your description sounds eerily familiar to an issue I experienced. Reduced engine power and jerking, especially under acceleration, were my primary symptoms. Did you by any chance check the ignition timing? That, coupled with potential combustion chamber deposits, could be your culprit. It's like trying to run a marathon with clogged arteries.

Interesting. Ignition timing wasn't something I specifically looked at. When you mention combustion chamber deposits, are we talking about carbon buildup on the piston heads themselves? Did you manage to resolve the issue yourself, or did it require professional intervention?

Yes, carbon buildup on the piston heads and cylinder heads was the primary issue. It was causing pre-detonation, throwing off the ignition timing, similar to how a pebble in your shoe throws off your stride. I initially tried fuel additives, but they offered minimal improvement. Ultimately, I had to take it to a workshop for a proper cleaning of the combustion chamber. Considering you are seeing smoke and have errors stored, a professional diagnosis is probably your best bet.

Took the Exeo to a workshop. Diagnosis confirmed combustion chamber deposits causing the detonation. They performed a chemical cleaning of the cylinder heads and replaced the spark plugs, costing 425€. Seems to have resolved the issue. Power is back, no more jerking or smoke. Thanks for the input.

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SEAT

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EXEO