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520d engine note changes - help!
Hi everyone
First post on here. I've had my 520d Msport for a few months now and absolutely love it! But I've started to notice something that's niggling me.
I travel quite a bit on motorways and I've occasionally noticed that the engine note suddenly becomes slightly deeper for no apparent reason. The best way I can describe it is that it sounds like someone has put their foot over the exhaust blocking the escaping gases. It also appears to coincide with a sudden drop in fuel economy (according to the onboard "average") and it feels slightly more sluggish.
It's hasn't dropped into eco-mode and the auto transmission is in the correct gear (my old 530d used to drop a gear when it felt like it!). I have a thought on it but don't want to be charged £40 for wasting my local dealers time trying to find an intermittent niggle! Oh, and I'm not going to say what I think it is so I don't sway any opinions!
Any advice is greatly appreciated.
Cheers
Keith
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