Got a strange loud knocking sound coming from the front of the engine, it is speed related and it seems to be coming from the top of the engine where the cam sprockets are, i have taken the cover off and listened while i revved the engine which the noise starts to dissapear when the revs get higher, when i come off the throttle the noise reappeared as normal
I have not had any dip in power as far as i can tell and the sound seems to sound like a plastic cover being nocked but when i checked i could not see any problems or anything in the way of the cambelt, which leads me to belive its something on the inside of the engine however when i plac my ear over the oil filling hole you cant hear any sound resonating from there, however you can feel the knocking on the top of the engine and you can hear it in the car, also when the car in Drive (its an auto) and stationary the noise is even louder ??? So i really dont know what to think can anyone help
Video added - Sorry not a very good quality one - will post a better one soon.
http://www.youtube.com/watch?v=eHrRLo3B2nw
This is while it is idling (as this is the only time the sound is present) and close up to the cam sprocket which is where the sound seems to be coming from- please note there is no missfire either and the sound is "plasticy" i.e it does not sound like a metal sound.