During highway driving continuous loss of speed

After about 10 minutes of driving at highway speed, there was a loss of speed five different times. It had that feeling that I had let go of the gas pedal, but I never did. Then the car stalled at 67 mph. I did my best to get to the shoulder of the highway and then tried to start the car, but it would not start. For about 10 minutes I kept trying to start it. Then I waited ½ an hour and it started. What caused this and how should I proceed to fix it?
Experienced mechanics share their insights in answering this question :
There are known issues with premature carbo buildup in the intake system causing driveability issues with this model. I would check with the dealer for service bulletins for the engine system and driveability issues.

How to Identify and Fix Common car Problems ?

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It could be due to a problem with the timing belt, the spark plugs, or the fuel injectors. It could also be because you have a dirty air filter or a clogged fuel filter. The fuel system may also be low on fuel. The accelerator pedal may also be sticking.
It could be a dead alternator, a bad coolant sensor or lack of fuel, just to name a few. Is your car stalling while accelerating? If so, then it could be a major vacuum leak, clogged fuel filter or a bad fuel pump. If your vehicle is stalling when driving, seek professional help to track down and fix the issue.
As you regularly drive your BMW, the fuel injector`s small passages can become filled with dirt or debris, like clogged arteries in the body. If this happens, the fuel supply to your injector becomes limited. The result is slow acceleration or a sudden loss of propulsion.
Worn Transmission Fluid (Automatic Transmission)

Over time, the transmission fluid gathers dirt and grime. This can cause the engine to run roughly, stall or fail to accelerate when you press down on the gas pedal. You may need to have a transmission fluid change before more damage is done.

Odds are, if you smell gas while cranking the engine, it`s getting fuel. It`s probably not getting spark. Common causes for no spark: Bad crankshaft sensor. Bad camshaft sensor.
Some of the most common sensors that lead to engine stalling include the mass airflow sensor (MAF), engine coolant temperature sensor (ECT) and manifold absolute pressure sesnsor (MAP). The idle air control valve (IAC) and exhaust gas recirculation valve (EGR) are also well known for causing engine stalling.
Clogged car air filter

If you have a dirty or clogged air filter, not enough air is getting into the engine for optimal combustion, and there will be a lack of power when you are trying to accelerate, especially on Diesel vehicles.

Possible causes of a power failure could be either bad battery connections, a bad ignition switch, or a bad alternator. What you need to do is check your vehicle`s power sources.
This is normally caused by one the following issues: Defective battery. Bad alternator. A blown fuse.
If when you put your vehicle into gear and it won`t move, this may be a problem with low transmission fluid due to a leak, the shifter, shifter cable, or it could even be a problem in the valve body of your automatic transmission.
If your car emits a rotten egg smell, there might be a problem with the catalytic converter, fuel pressure regulator, fuel filter, or even the old transmission fluid. Whatever the cause, if you get the rotten egg smell in your car, take your vehicle to the mechanic as soon as possible and resolve this problem.
Battery issues

Normally, the sulfuric acid stays in its case and doesn`t cause any problems. But if the battery freezes, shorts out, or has a cracked case, the sulfuric acid can leak out, causing a smell like rotten eggs. You may also notice that your car has difficulty starting.

The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.
Will a bad O2 sensor cause rough idle and loss of engine power? You bet. Moreover, you may also notice poor acceleration, engine misfires, and even stalling. Bad oxygen sensors disrupt all kinds of essential engine functions, including engine timing, combustion intervals, and air-fuel ratio.
Car Will Not Start: Over time, as the camshaft position sensor fails, the signal it sends to the engine control module weakens. When the engine no longer receives the signal, you will not be able to start your car. Engine Misfires: A failing camshaft position sensor can cause your engine to misfire.
Bad Sensors

One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.

If the diesel particulate filter is heavily loaded, it clogs, causing the exhaust back pressure to become too high. The consequence of this is the engine may shut off while driving. In most cases, only the replacement of the diesel particulate filter will help to fix the issue.
Yes, a dead battery will cause your vehicle to function progressively worse until it finally grinds to a halt on the side of the road.
This is a common symptom of a plug or wire electrical current problem. Air or Vacuum Hose – Another common cause for engine vibration and power loss is when air or vacuum hoses come loose, begin to leak, or rupture. The three necessities for all combustion engines are air, fuel, and spark.
The car tends to slowly lose power if the alternator has gone bad while the car is being driven. You`ll notice the headlights start to dim shortly before the car loses power and dies.
It sounds like you may have a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator pulley.
What is Limp Mode? In short, limp mode is your BMW`s way of protecting your engine and transmission. When the engine or transmission control unit, called an ABS, detects faulty functioning, the malfunction code is stored in the device and is then assessed to determine the severity of the issue.
What is sputtering? If your vehicle is sputtering, it means that it isn`t getting enough fuel or power. If you experience sputtering and press down on the gas pedal and the sputtering doesn`t stop, this is a sign that there is an issue with the power supply. If it does stop, there is an issue with fuel delivery.
This is a common symptom of a plug or wire electrical current problem. Air or Vacuum Hose – Another common cause for engine vibration and power loss is when air or vacuum hoses come loose, begin to leak, or rupture. The three necessities for all combustion engines are air, fuel, and spark.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

During highway driving continuous loss of speed – 2010 BMW 335d
ANSWER : There are known issues with premature carbo buildup in the intake system causing driveability issues with this model. I would check with the dealer for service bulletins for the engine system and driveability issues.

when driving speed slow down and resume to speed it begins to jerk i have to put in over drive to resume speed especially on hiway
ANSWER : You should have the vehicle scanned. The data from the speed sensor needs to be checked to see if the transmission or engine is the cause of the jerking. You may have a transmission solenoid that’s not shifting correctly, an engine misfire, or a sensor malfunction. Have a certified mechanic, like one from YourMechanic, scan and test your vehicle for you to properly diagnose the car’s jerking symptom.

When I drive a speeds of 25 to 35 the car shakes but if I drive speeds faster than 40 it doesn’t shake.
ANSWER : Check the tires for any cupping on the tread. If the tread is cupping, then I recommend replacing the shock absorbers. Also, I recommend having all 4 tires checked for balance and make sure that they are good. A bent rim can cause the front end to shake and smooth out as the speed increases. If the tires are good and have no issues, then the suspension may be loose cause the front end to move around on the bumps from the road way. If you need further assistance with your front end shaking, then seek out a professional, such as one from Your Mechanic, to help you.

my corrola, while driving suddenly slows down, specially while driving at a 120 kms speed suddenly the speeds slow down and the pu
ANSWER : If you are driving at 120 mph, it is possible that your vehicle is hitting the speed governer. This speed governer will prevent the vehicle from going past a certain speed by limiting engine power and reducing rpms. Not all vehicles are set to the same speed. The speed is usually determined by the speed rating of the tires that the vehicle came with from the factory. This is to prevent vehicles from driving at speeds faster than the tires allow even if they have enough power to do so.

The vehicle makes a humming/whining sound immediately after highway driving. After several minutes off highway, noise stops.
ANSWER : Hello, thank you for writing in. There are several issues that may cause these issues. You will want to start by making sure the brakes are not sticking. This can be done by raising the vehicle and checking for grinding or rubbing. Secondly, check the tires to make sure they are properly balanced, have good tread, and are properly inflated. These are the most common causes or tire noise. However if the issue goes deeper, you may want to inspect the wheel hubs and suspension. If you have more reason to believe the convertible top is to blame, check the seals and the latches first. For more help with an inspection, contact our service department to schedule an appointment.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

Car only drives in first and reverse
ANSWER : What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle speed sensors and engine speed sensors. Based on this information, the Engine Control Unit (ECU), or the Transmission Control Unit (TCM), executes the appropriate upshifts and downshifts by sending a signal to one of several shift solenoids. These transmission solenoids have spring-loaded plungers inside them, which are wrapped with wire. When this coil of wire receives an electrical charge from the TCM / ECU, it causes these plungers to open, allowing transmission fluid to flow into the valve body and pressurize the desired clutches and bands. When this happens, the transmission changes gears and you continue down the road. The computer controls the transmission solenoid in several ways. If the vehicle is equipped with a dedicated Transmission Control Unit, it can open or close the hydraulic circuit using a direct 12v signal. In some cases, the Engine Control Unit (ECU) can control the solenoid’s plunger by turning the ground circuit on and off. When this is not working properly, this can cause a jerking reaction, a delay in shifting or in some cases may cause the transmission to hesitate in shifting gears. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your transmission.

Loss of power, drive. 2010 Ford F150
ANSWER : Hello – check first for the correct fluid level (and condition – red and relatively clear) of transmission fluid. If fluid level and condition are proper, the problem is likely with the internals of the transmission: fluid pressure and valve body problems affecting the clutches, or a failure of the planetary gearset. There is a Ford Technical Service Service Bulletin (# 384974) regarding failure of the planetary gearset. I would recommend a transmission inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.