My defender TD5 (9k miles) has a noticeably loud tapping noise from the engine at around 60mph in top gear. It only appears at this precise speed, but is not always regular in frequency. It's been there since the vehicle was new. Knowing about the oilpump problems, I'm getting paranoid. Any suggestions?
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It's no longer under warranty. I had ECU mods carried out. The tapping was evident before this work was completed.
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