My BMW 323C slow down quickly when my foot off the pedal
I have a 1999 BMW 323 convertible and it decelerate quickly once I let my foot off the pedal even at neutral gear. I worry that the mechanics did not fill enough oil or over filled oil when he replaced the auto-transmission oil recently. He used 3 bottles of 1-quart oil. I do not hear any strange noise, but the engine's warm up in the morning makes a big noise.
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Re: My BMW 323C slow down quickly when my foot off the...
Thats interesting considering these BMW auto boxes have about 10 quarts of oil in them, when chainging the trans oil not all of it comes out but it should be at least 5/6 quarts. You need to get the oil level checked asap.
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It's not a malfunction- this particular auto's idle rpm speed is low and it simply lacks the power to hold on the gradient of the slope- until of course you step on the accelerator pedal.
There is a very brief lag time from the moment your foot comes off the brake pedal to the time it reaches the accelerator pedal; such that by the time the torque converter is able to "perceive and respond' to your brake pedal to accelerator pedal movements, the car will- by the vary nature of gravitational force move in the direction it is being pulled until a force of equal or greater resistance is applied to either hold it in position or move it in the opposite direction.
By its very definition, a torque converter is a type of fluid coupling that is used to transfer rotating power (the engine) to a rotating driven load (the drive train)- that is the transmission, drive shaft, axle gears, and wheels that the tires are mounted on. [The transverse engine set-up is different than an in-line engine design, but the operating principles are basically the same]..
Automatic transmissions work on the same principle of a water wheel. As the current force of the water drops into the vanes of the wheel, it is converting that water force or pressure into useful forms of power as the wheel spins.
If the current flow of the water is so slow that the paddles of the water wheel are unable to detect any force, the wheel does not move- therefore no power-torque output.
Likewise, if the engine is idling too slow for the vanes in the torque converter to detect any push the transmission into power-torque output, then the car is going to freely go into the gravitational direction of the slope.
Do you have any codes? If so, what are they? If not, this could be a mechanical problem with either the torque converter itself or some sort of stuck valve in the valve body inside the transmission. I just replaced the valve body in my wife's 1999 Mercury Sable and it cleared up a number of problems she was having with shifting and torque converter lock up. I hope this helps. Good Luck!
I had same problem. Driver door would lock/unlock with key in keyhole in door, but not with fob, and other doors would not lock/unlock. Even once inside none of the doors would lock/unlock with lock switch, or even by pulling handles. Mechanic (very trustworthy) explained I needed a new control module (cost me $600). Good Luck. $600 is better than having to roll down the windows so Grandma can Luke Duke it outta the car.
BMW radiators are relatively cheap even at the dealer level ($250 approx), however BMW will almost certainly tell you that you must replace the thermostat. The thermostat is one of those parts that either works or not and if it has failed, you will know immediately after you test drive with the new rad. you should do that first before you waste more time and money on a thermostat you don't need. Most BMW's have a rad with a plastic upper hose connection and this fails - this is different than most other vehicles where the rad plugs up and the overheating prior to the final failure of the rad damages the thermostat