Join Date: Jul 2013
Location: Derbyshire, UK
Vehicle: GLA 45
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ECO4 Drone at 50mph/80kph
I have noticed just recently that my R172 55 makes a god awful drone noise between 45 and 55 mph (~1300rpm approx.) when in ECO4 mode, if I switch off ECO on the dash and stay in C mode then the drone disappears. If I switch to S or M, I don't get the drone, so I assume it is to do with the rpm and the 4 cylinders being deactivated.
It's loud and annoying... anyone else suffer with this?
Please don't offer advice such as: drive at a different speed or out of ECO Mode as there are lot of contraflows and average speed cameras that dictate 50mph on my normal routes (M1 J28<>42 and cat and fiddle), so I may as well try to get a few more mpg while my foot is forced as it were.... just want to know whether a trip to the dealer is in order.
Not sure whether the R171 or R170 had eco mode that affected lit up cylinders, hence why it is in the section just in case they did.