PeachParts Mercedes-Benz Forum - View Single Post - not just wind... loose a lot of speed when off the throttle

JHZR2 · #1 01-13-2004, 04:13 PM

Hi,

I brought my 83 300D in for service, and the loner my indy gave me was another 83 300D. It wasnt as nice as mine, but the performance difference was noticable.
What struck me the most was the ability to coast and not loose speed.

When I am going down the highway, or even down a steep bridge, and let off of the throttle at say, 55, Ill be at 50 in a second, and keep slowing from there at a very fast rate. 65-60 is the same, more or less anytime I let off of the throttle, Ill loose speed at 5+mph per second, even on a steep decline!

The loner 300D didnt do this at all. It did more as I would expect, I let off of the throttle, and it very gradually slowed. Not more than 1/2 mph per second at 55 mph.

So, my question is, why would my car do this? I always attributed it to my car having the aerodynamics of a brick, but obviously thats not it.

What really gets me is the economy of my car. A suggestion for the quick loss of speed miught be a slightly siezed calpier or partially releasing parking brake, something like this. But it definitely isnt, because for as long as Ive had this car, now over 50k, its done this. And, its done this while constantly getting me between 27.5 and 30 mpg! Its not the tires either, as I have the same ones (dunlop sp sport A2) on my fathers van and my girlfriends car, and they dont have a whole lot of rolling resistance, and they are aired up properly.

SO, any comments? Could wheel bearings do this? Any other suggestions?
Thanks,

JMH