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Re: Transmission lurches when lightly accelerating...
Shift solenoid would be my first thought but you do want to check your transmission fluid and change it every 60,000 miles or what is recommended by the manufacturer
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You need a better scanner to diagnose, not just for codes. It sounds like faulty shift solenoids. A professional grade scan tool computer is bi-directional and can command solenoids to operate and verify that they did.
A engine misfire possibly . TCC -
Torque Converter Clutch
Automatic Transmission Torque Converter Clutch TCC Without testing it or feeling the problem it's hard to say . Check engine light on or flashing ? Suggest you take it by a repair shop and have them take it for a drive with you . Hooking up a scan tool to check misfire counts etc... Takes the guess work out of it !
I wouldn't think the PCM/ECM is the problem ,
hesitation at about 40 mph and 60 mph.. Something in the ignition system is breaking down causing a misfire or maybe TPS - throttle position sensor , these wouldn't cost to much. The dealer should be able to find the problem . An usually lights Flickering could be loose connection , high resistance in the circuit.
Fixing Strange Auto Electrical Problems
You will need a computer to accurately read the signals you are getting from the sensors in the engine bay, but my guess is that the MAF sensor may be acting up.
I think you need transmission fluid serviced with Mercon V from a Mercury dealer. I think the friction shoes in the torque converter are "Chattering" at lock up.
Try driving the car with O/D off and then w/o going into 4th gear. Leave it in 3. See if the vibration is gone.
I would run some engine diagnostic tests to determine if it is an engine problem. Then I would aim to look at the transmission system. This also involves looking into the transmission's computer. You need to take it to a shop that has a scan tool that can scan the transmission control system. A lot of the BMW have advanved logic in the computer and the average shop will not have the tool. You will probably have to take it to a bimmer dealer.
Lurching? You mean kind of jerking when accelerating? Another person had a similar problem. To not be repetitive, this great diagnostic article points out to six possible causes of this problem:
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