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Thread: 7 series battery died replaced battery and now cranks but no start.

  1. #1
    Join Date
    Feb 2014
    Location
    NICE CALIFORNIA
    Posts
    3
    My Cars
    95 318I, 91 735IL

    7 series battery died replaced battery and now cranks but no start.

    So my 3 series was broke down and I borrowed my sons 7 series (2001 740il) to go to work. After work the battery was almost completely dead. Jumped started the car and let it run for about 10 minutes to charge the battery. Turned on headlamps and the draw instantly killed the motor. Next day removed battery and had tested. It was no good. Replaced battery and now the car cranks but will not start. Sometimes it will fire but dies as soon as it fires. Checked fuel pressure at the time it had 50psi. Had one of the technicians were I work scan it with his scan tool and 6 codes all pointing to the throttle body. So hauled the car home, installed a new throttle body and still no start. Checked fuel system pressure again now it has none. Fuses all good. Relays all good. Bypassed relay and jumped fuel pump and it came on and bam 50psi again. But the car still doesn't run. Bought an expensive scan tool and after clearing all old codes tried again and now it reads 3 codes. One for throttle body and two for throttle position sensor. Also when looking at real-time data it shows fuel system 1 is open and also fuel system 2 is open. I don't believe that a faulty throttle body would keep the car from turning on the fuel pump also because it says fuel system open. Not sure where to go from here short of having it towed to a BMW repair facility. Really trying to avoid that if I can. Any help or input would be greatly appreciated.

  2. #2
    Join Date
    Jan 2011
    Location
    Bonita Springs, FL
    Posts
    499
    My Cars
    01 740i, 09 X5, 12 335i
    First, I wish I still had my 69 Nova SS 😎
    I am no expert, but some have had the EWS lose sync with DME when the battery fails while the key is in the ignition in the on position. Here is link with more info
    http://bimmerboard.com/forums/posts/1265801

    2001 740i Sport - Anthracite Metallic, Gray Interior, 750 Porn Lights, 750 Seat Backs, Hoen Xenon-match Fogs, Crossed drilled, slotted rotors, LED Interior Swap.

  3. #3
    Join Date
    Feb 2009
    Location
    KC North, MO, USA
    Posts
    11,153
    My Cars
    1996 740iL
    Agreed. DME needs to see signal from the crank sensor and matching code from EWS to call for fuel and spark. Common issue is the loss of sync when battery dies with key in ignition. Also make sure you check the 5 fuses in the fuse carrier that sits in the ebox. A good scanner should be able to pick up the crank sensor but it does not always throw an OBDII/P code.

  4. #4
    Join Date
    Feb 2014
    Location
    NICE CALIFORNIA
    Posts
    3
    My Cars
    95 318I, 91 735IL
    Well thanks for the advice. Since we didn't have the tools to sync the two modules so we had the vehicle towed to nearest shop the works on germen vehicles. It wasn't that simple for them either. As it turns out both modules had water in them and shorted out. I am still not sure how two modules just happened to short out at the same time but that is what happened.

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