E39 525 Newbie with E39 525D starting problem!!
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  1. #1
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    chaz_lee's Avatar
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    Newbie with E39 525D starting problem!!

    Hello everyone..

    Browsed these forums for quite some time so I thought it was time to sign up..

    Anyway iv got a problem with a beemer..

    Iv got an intermittant starting problem..

    Its my mums and she kept moaning that it wouldnt start some mornings first time.. I went out to it after she moaned and it would start straight off.. But my dad went out just after I did and it wouldnt start.. Weird..

    Anyway I had a closer look, the pump isnt buzzing when you turn the ignition on, only sometimes, when you hear it buzz you know its gunna start..

    But now it wont buzz at all, I cant get the pump to kick in..

    Pump at fault? Or could it be something like the pump relay? Immobiliser etc..?

    Also noticed it doesnt want to rev up when its cold.. And if you rev it right round its restricted to 4000 RPM.. If you hold it there after about 5 seconds it will clear, a bit puff of black smoke out the back and it will rev right round to the limiter but when you let off and let it idle when it reachs idle speed it starts to splutter slightly then it clears again..

    Took it up the road when I eventually got it to start and its flat as a pancake, its an auto and when its gets into 3rd its sitting at 4000 RPM for ages before it will change up, and when you kick down, it changes down but doesnt pin you like it should..

    After all this I had the filter off and emptied it and the diesel came out black! So as a temporary measure I reversed the filter and blew it all backwards to get all the crap out, the diesel coming out is now clear, it seems to be a lot quicker and happier to pull but still not right..

    I come home parked it up, went back to it 10 mins later and nothing, cant get the pump to kick in..

    I had the pump under the passenger seat out, wired it to a battery and it buzz's away and pumps fuel like mad..?

    I took the fuel pipe off just BEFORE the middle pump and the rear pump in the tank is working, there seems to be one each side? Dont know if they are both pumps? But they both are buzzing anyway..

    I put the middle pump back on and it started again?

    I pulled it forward 10 yards, stopped it.. Went to start it again and nothing..

    But sometimes the pumps will kick in and sometimes not, I dont think it is the pumps at fault.. I think something is stopping them from kicking in..?

    Any advice? Its driving me mad!!

    Cheers,
    Chaz



    EDIT;

    Would it possibly be the crank sensor? If so where is it located on a E39 525D..?

  2. #2
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    Stal1878's Avatar
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    When the pumps don't buzz on the key, have you tried putting a multi meter on the feed to the fuel pump(s)? If you have life there its the pump and if you don't have any power its going to be something further up the line(relay, immobiliser ect).
    Have you checked if the pumps are clogged up with dirt if the fuel filter was that bad?

  3. #3
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    Quote Originally Posted by Stal1878 View Post
    When the pumps don't buzz on the key, have you tried putting a multi meter on the feed to the fuel pump(s)? If you have life there its the pump and if you don't have any power its going to be something further up the line(relay, immobiliser ect).
    Have you checked if the pumps are clogged up with dirt if the fuel filter was that bad?
    Yeah my dad put the multi meter to the middle pump while I flicked the ignition on and there was live to them.. But this was when it was working.. Obviously when it doesnt buzz theres no live there.. Dad took all the middle pump out again and connected it to a battery and it worked and we had it running.. Once he put it all back together and the panel back on, it wouldnt start again and had lost live..

    He thinks theres a loose connection somewhere but I think its a co-incidence and something is tripping the pump out, like the immobiliser or something..

    Mum did say its getting harder and harder to unlock with the fob now days, dont know if the two could be linked..?

    It was supposed to go into a garage in the morning for a diagnostic read out (as my scanner isnt connecting to it) but I cant get it started again now!

    We have the middle pump off and pumped a load of clean diesel through it while it was off so that isnt blocked for sure, neither is the filter now, I dont know about the pump in the tank though.. Which side is the actual pump as there is one each side and I think one may be just the sender unit?? Am I right..?

  4. #4
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    I don't know anything spesific about the E39, sorry. Just trying to help. Like you say, if there isn't any live going to the pumps its got to be something with the electrical supply. I really don't know if the immobiliser is connected to the pumps. Have you got a spare key for it? Might be worth trying that?

  5. #5
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    Quote Originally Posted by Stal1878 View Post
    I don't know anything spesific about the E39, sorry. Just trying to help. Like you say, if there isn't any live going to the pumps its got to be something with the electrical supply. I really don't know if the immobiliser is connected to the pumps. Have you got a spare key for it? Might be worth trying that?
    Ahhh ok no worries..

    Id say the immobiliser is connected to the pumps in some way, it has to be to stop it from being nicked.. Unless BMW have got another way of immobilising the car..

    No spare fob but we have a spare key but it is just the key..

    Thinking about it.. When dad was making the pump work by wiring it to a battery it would start first time.. So I think its something in the car not kicking the pumps in..

    Might be wrong though.. Why are BMW's so complicated! lol

  6. #6
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    tbh it sounds like the pre-supply pump is fubarred, they do seem to fail when the colder weather sets in, diag scan will confirm whether this is correct or not.

    GL

  7. #7
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    Quote Originally Posted by simonsays View Post
    tbh it sounds like the pre-supply pump is fubarred, they do seem to fail when the colder weather sets in, diag scan will confirm whether this is correct or not.

    GL
    Will the ECU still store codes then even though the engine management light isnt even on..?

  8. #8
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    On the engines I have worked with the immobiliser is sometimes connected to the stop solenoid on the fuel pump(not sure if common rail pumps have this though?). Could also be done by the ECU not sending the signal to the injectors to open.

    The ECU will store codes no matter what, if only turns the EML dash light one for certain ones.

  9. #9
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    Quote Originally Posted by Stal1878 View Post
    On the engines I have worked with the immobiliser is sometimes connected to the stop solenoid on the fuel pump(not sure if common rail pumps have this though?). Could also be done by the ECU not sending the signal to the injectors to open.

    The ECU will store codes no matter what, if only turns the EML dash light one for certain ones.
    Ahhh ok cheers mate..

    I dont think this one is set up to just not open the injectors or else id still be getting fuel up wouldnt I..?

    I think first thing il do is get a diagnostic scan done..

    Cheers for the help!

  10. #10
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    If the immoblisier is indeed connected to the fuel pumps then you're correct, but we don't know that yet and it could still be a loose connection/faulty relay?

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