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Rough idle in cold weather.
Rough Idle could be caused by many things and is hard to diagnose. BMW have a known issue with the vanos solenoid that causes this problem. I would have the car checked for codes and have a technician troubleshoot the...
Key not working when I try and start car.
Based on the fact that someone tried to steal it, I would say it is possible that there is now a fault in your security system that is causing your vehicle not to start. However, it just could be an...
Car overheating and not accelerating
As far as the thermostat causing the motor to sound muffled, I personally have never heard of such a thing. Your thermostat controls when the flow of coolant in your cooling system starts, allowing the coolant to flow and cycle...
Car not going over 20 MPH
Hello. If the car will not go over 20 MPH then there can be a number of issues going on. If the Check Engine Light is on then the computer needs to be scanned for codes first. If there are...
After four alignments, car still dangerously pulls to right
Hello! I have not come across this issue specifically related to BMW's. However, what jumped out at me was the fact that two BMW dealership service departments aligned your 740i, took your money, and sent you away with a very...
Disconnected 2ga wire from battery; rehooked, but warning light on
Hi, thanks for writing in about your 2006 BMW 740i. Disconnecting battery cables while the engine is running causes a voltage spike in the electrical system. Electronic control modules typically do not take this well! Sometimes this will damage some...
Wiring harness burned up from short circuit to disa valve
Wow! Very disturbing issues to experience, especially the electrical smoke with your family in the vehicle. Based on what you've told me about you 2998 BMW 740i, this is not going to be a quick one to diagnose and repair....
Loss of reverse on a BMW 74 DI
If you are going to continue to drive it, you are going to need a new transmission, or you either park where you never have to back up. I said that to a customer with a BMW who did that...

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