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Engine Knock Cold Start My07 WRX 46000 miles


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Hi guys, I have an unhealthy noise being generated on cold starts. The engine sounds like it is knocking. After around 10 seconds the knocking will start and will continue for around 3-4 minutes until the engine is warm. Could this be a belt tensioner?

The knocking rate matches the engine speed. So when the idle speeds drops the knocking slows down. The car was serviced 2 months ago and has plenty of oil. Has just done 46000 miles also. It is a My07 WRX.

Here is a link to my video



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