have been having trouble with the car not starting. it will crank and fire quickly but not start . after many tries it will eventually start. sometimes it will stall after a few minutes of driving and other times it will drive just fine. i have replaced the fuel filter spark plugs. could it be the camshaft sensor or the crankshaft sensor?
I have trouble starting my X5. It will start fine some times, other times it will not start at all to the point it has to be towed to the garage. The mechanics are baffled. Any thoughts?
I have the same problem with a 2005 X5 4.4. It cranks just fine (not a battery issue) but the fire just doesn't catch. I've had this problem twice in the past week. The first tow to the BMW dealer, they replaced something on the starter. I picked it up and the exact same thing happened the next day. Once again towed to the dealer, but this time they haven't been able to duplicate the problem — its started every time!
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Check the battery cables. I had the same issues with my 96 tacoma, The battery cable connection at the battery can be cranked down but still be loose. Hard to explain, doesn't make sense, but just check it out.
If it fires only occasionally, my first suspect would be the crank position sensor (aka pulse generator). Should be on the front of the engine mounted very near the toothed wheel on the crankshaft,
You should check for fuel pressure at the fuel rail while you are cranking to see if it is a fuel delivery problem.
Could be a problem with the crank sensor which tells the engine ecu when to fire the spark plugs, common fault. Try holding accellerator pedal to the floor while starting, can flood with fuel, was a modification on some models to reduce fuel flow a while back.
maybe the crank position sensor, long starts are usually due to the fact the computer doesn't know where the NO.1 cylinder is, so he fires at random and eventually he nails it, therefore the car starts.
The crank position sensor tells the computer where the NO.1 piston is at and he knows when to send the spark, but u should have a check engine light on in this case.
There can be many causes for the car not starting. Generally it is usually a fuel or a distribution problem. Many fuel problems of this kind are related to electronic injection and ECU. This kind of troubles often need special equipment, and can be fixed only at a well equipped garage, where they can test fuel flow pressure and volume in monitoring ECU feedback at the same time. Simple things you can do are Checking and eventually replacing fuel filter. Checking and eventually replacing air filter. Check that there is no oil on top of new spark plugs. In last case try to listen if car is running on three cylinders, this can leave uncombusted oil on cylinder, and mean there are troubles with distribution or camshaft. It is useless replacing one of the sensors without testing them, and when a sensor is gone you usually get some additional light on your instrument panel. At a garage they will connect straight to the computer and get an error message in return, in case one of the sensors is bad.