Post edited 10:30 – January 20, 2011 by hu88ertvelsat
For a little while now, my Vel Satis has made a strange noise accompanies by a weird feeling, only occasionally, and it doesn't seem to affect things.
What happens is, you can be driving along steadily at any speed and sometimes the engine "feel"/sound starts to become slightly muffled almost as if someone has put their hands over your ears – and then it's quickly followed by a very slight rocking and more notably, a cyclical noise almost like a large dog panting with its tongue out (and sounds/feels slightly like the rear wheels aren't getting traction). To get rid of the panting noise and slightly odd feel to the engine/drive train, all I need to do is very gently either slow down and gently accelerate again, or gently accelerate. The panting noise and odd engine feel both immediately go away, and things seem fine. The noise/sensation does appear to be coming from the middle or rear of the car, not the front, I don't think (though could be wrong). It kind of feels like the car is struggling slightly because it's in the wrong gear, so perhaps gently (not kick-down!) pressing or easing off the accelerator pedal makes it change gear (not that I notice it changing up or down, so maybe I'm wrong!).
No stop or warning lights have ever come on when this panting noise happens and performance seems normal, with the same MPG as usual, etc, etc.
A mechanic I took for a spin one day (about something else) said it's engine misfire and maybe one of the cylinders/injectors is blocked, so he suggested trying injector cleaner. I did do, for the last 6-8 months, but no difference – getting slightly worse, in fact.
Any ideas chaps?
PS – Notes: (been researching, just to show I'm proactive as usual!)
- Problems with DPF (Diesel Particulate Filter)
- EGR Valve
- Blocked Injector/Cylinder
- Broken Motor Mount
My engine has felt and sounded rougher lately and I also get an occasional rubbing sound from the OSF wheel area, so perhaps the odd "dog panting" sympton when driving is also the same thing i.e. a broken/loose motor mount or some other mount?
Anyway, will wait for your thoughts. Don't want to pay dealers' rates straight away without researching and posting on forums.