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Car shuts off while driving at highway speed.

(1998 BMW 740iL)
in Nashville, TN on April 26, 2009
my 1998 740iL shuts off sometimes while I'm driving on the highway. Is this a map gas sensor problem?

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Popular Answer
This sounds real dangerous. How frequently does this happen and does it restart immediately?
Has there been a Check Engine Light on? If so the computer in your car will hold important information.
If I get a car with intermittent stalling like this I plug in my scan tool and drive the car. When it stalls I look at sensor information data shown on the scan tool. You see a lot of information. I also look at the wiring diagram and connect voltmeter leads to likely problem areas and look at what is or isn't getting power when the car fails.
I also T in a fuel pressure gauge and tape it to the windscreen to see if the problem is fuel, ignition or other electrical problems.
Sorry I don't know any specific problem with your 740.
on November 07, 2010
I went through this for several months and after replacing the (MAF) Mass air flow sensor that fix my nightmares.even the engine light went off by it self after 7 codes keep comming up just because of the MAF>no more dying on the middle of the autobahn or freeways ,or at stop lights.
Good luck guys.
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