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Today I had some free hours to try the sparkplugs. One of them wasn't torqued to spec and I could rotate it another half turn before it was correct. Others were ok.
The sound wasn't resolved that way. Still persists, same volume.
Any more thoughts? I tried to listen from underneath the car, but difficult to pinpoint. Sounds more from engine side than exhaust, but couldn't tell a real difference left to right or something like that.
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