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1998 BMW 740iL Question: car shuts off while driving at highway speed.

 

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740iL 1998, Nashville, TN, April 26, 2009, 16:29
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my 1998 740iL shuts off sometimes while I'm driving on the highway. Is this a map gas sensor problem?

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, April 26, 2009, 19:56
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    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.

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  • Answer #2

    Visitor, November 07, 2010, 02:17

    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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