I was coming up a slip road to join onto a motorway a couple of days ago, must have hit 5500 rpm in 2nd before changing gear, then as I changed gear I.e let off the throttle, I heard a pop pop from what it sounded like the exhaust and engine a bit like a back fire or miss fire i guess. Then again from 5000 rpm changing from 3rd to 4th. At first I thought hey this is cool
but it has not happened before and not since.
Just wondered what it is generally related too, my car has done 123,000 miles and has done 9,000 miles since its last service.
Is the pop related to something wearing out or timing out on something? or nothing to worry about
Thanks in advance.