Hot start detonation 4.2 FSI

 
Old 07-29-2018, 05:08 PM
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Default Hot start detonation 4.2 FSI

I actually have a Touareg, but since its 4.2 FSI far more common in the Q7, I thought I would ask here.

When the engine is at operating temperature, shut down for 1-5 minutes, and restarted, I can hear detonation. Hot starts almost seem too fast-- the knock happens on the 1st or 2nd crank, and the engine immediately starts after. It does not seem to happen again while running. Cold starts are always fine, but they take longer, after 4-5 cranks. I only run premium fuel. Octane booster does nothing. I've yet to try ethanol free fuel, but it's never needed special fuel before. Carbon cleaned ~10k miles ago.

Does anyone else have this? VCDS does not indicate any problems, and I have no check engine light.
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Old 08-05-2018, 09:13 PM
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Bumping. Nobody else with this issue? It seems to be getting worse and I'm concerned I'm eroding away my pistons/seals.
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