Whats wrong with my BMW 330xi? I was driving down the high way all of a sudden my car quit accelerating but the engine was still running and a nasty smell came from the car i can start it and run in park but when you put it into drive it starts to sound funny and still wont accelerate itll just rev up high RPMs we have hooked it up to a scanner to see if any codes come up but nothing came up
Give it up and have a dealer look into this problem.
SOURCE: Engine hesitates on acceleration
try checking the spark plugs,roter, coil, and even your cable on your throttle body
SOURCE: my xj6 runs at high rpms and accelerates on its own
None of those possible problems have anything to do with idle speed. The first thing might be a very weak throttle return spring. The next would be a sticky throttle cable or foot feed pedal that isn't moving freely. Another possibility is a vacuum leak somewhere. Did changing the spark plug in #1 cylinder help the misfire? If not, you may have a partially plugged injector. Fixing the misfire will only increase idle speed some more. Look for an idle speed motor near the throttle body that is supposed to raise idle speed when the engine is cold and lower it back when the engine warms up. Check to see if it is holding the speed too high. If the throttle position sensor tells the computer where the idle speed motor is set, then it could have an effect on idle speed if the sensor is bad. The position sensor is just a fancy potentiometer. Hope some of this helps.
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SOURCE: 2005 freestar driving down the road suddenly
The check engine light will always come on when the engine stalls.It could be your fuel filter needs replaced or your fuel pump is going out. The fuel pumps can heat up and stop working, then after they have a chance to cool off they will work just fine until they get hot again.
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