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I seem to have a rhythmic ticking that comes from the engine.
I have had the valve lifters ticking in the past which sounds different (a constant ticking which suddenly goes away after a few miles). This time it is about 5 ticks then it goes quiet, then another 5 ticks, then silent etc. Eventually it stops but not always.
The frequency of the noise increases with engine speed too.
I have no idea what it could be. I did think the DISA flap may be cycling, but it seems metallic not dull and plastic sounding. It also seems to fast for it to be DISA and as it changes with engine speed I have ruled out the DISA so am still stuck.
Any ideas please?
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