KV6 bad engine noise & vibration - looks like I may need to take my car to a garage

[Bolin]

Originally Posted by Bolin

Here is a video clip that shows the bad sound - the clip starts under the car near the oil filter, where the noise is loudest.

https://picasaweb.google.com/1090441...66603860461762

Originally Posted by Bolin

Here's a recording of the engine being started, and then revved. Oddly the sound gets quieter when the engine is revved, not sure if that is due to the noise itself or the camera phone. I couldn't tell from in the cab as the normal engine note takes over above a certain number of revs. In total I revved it to 4,400rpm but the recording may cut out before then. The black picture is correct, phone was usual way up with the camera to the ground so that the mic was closer to the engine.

https://picasaweb.google.com/1090441...90504328699522

Oddly, when I did rev it to 4,400 rpm the 'check engine' warning came up, never seen it before. When the revs returned to idle it went away after a couple of seconds. I reved it again to about 4,600 rpm and there was no warning. Odd

Ok. Compare the old clips to the new ones below.

This first one was done from cold, engine not started for 7 hours, coolant temp 23 degrees. The clips starts off under the car, by the crank pulley, then moves around the top of the engine bay, before returning to under the crank pulley.
https://picasaweb.google.com/1090441...93544668537202

This second clip was done when the engine had reached 88 degrees (so bear in mind the lower idle rpm once warm) and again starts off under the crank pulley. The engine was then revved to roughly 4,200rpm and imediately released back to idle. The clip then moves around the top of the engine bay before returning to under the crank pulley.
https://picasaweb.google.com/1090441...95649042239634

Oddly the car did seem a bit 'boomy' from the exhaust when cold, and when I revved it just after finishing the second clip there was a 'cough' or 'hiccup' or missfire thing happening. I'll need to look at the exhaust, the box after the main cat is rusting away at the ends, perhaps it's got too bad. There was also an 'air' sound either being sucked in or blown out, not sure which, but didn't exactly sound like the exhaust was blowing as such. Maybe this explains the check engine light I had earlier (not come back though)?

Depressing the clutch has no effect on the vibration, which does seem to get a bit worse when revving up compared to at idle, and still gets much more noticeable when the revs are released and drop back to idle.