Now fixed- no engine pinking/clicking..
Sorted it out now. I took the oil cap off and the engine was making a loud popping sound. According to great YouTube videos by SiRobb I learned that one of the engine mounts was leaking vacuum. So I did as he said and disconnected the pipe going to the T piece vacuum pipe that splits it to the turbo also.
Immediately the car was way faster and smoother, so I now realise it was the turbo that wasn’t working.
I know it has been like this for a year and worry that it’s been running rich. I then bought some hydraulic lifter additive and the engine now purrs like new and is accelerating smoothly.
Just need to sort the “leaky” engine mount now.
Liqimoly I think was the additive I used.
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