Question about BMW 535

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'89 BMW 535i Security Sytem Problem?Won't start after engine swap

I have a 1989 BMW 535i. I just put a rebuilt engine in it as the old one was siezed up from the previous owners of the car. I got everything installed again everything plugged in I've checked over and over again and have even had my neighbors see if they could see anything obvious that was wrong but everything looks's the won't start. There is no spark, and the fuel pump is fine I tested it but when the ignition is turned over the pump won't pump fuel to the engine AT ALL.(I also put a new fuel filter in too) I bought a new fuel pump relay. It works and I tested it and the pump by putting a wire to plugs 87 and 30 and the fuel pump kicked on strong just like it should. But again when trying to start the car it's like the security system won't let anything run. I also don't have power to the fuel pump FUSE (15amp). I tried resetting it by closing the door and locking it then unlocking it, then getting in the car and trying to start it...still it just turns over. I have come to the conclusion that it has something to do with the factory security system. Does anyone know what I can do???

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  • Cameron Garcia
    Cameron Garcia Jun 29, 2009

    Thank you for the info. I will check it out some more and see what happens and get back with ya' on it.

  • yadayada
    yadayada May 11, 2010

    try live chat. that is if you want a timely anser.

  • Stig Tomta
    Stig Tomta Mar 30, 2014

    I have the same problem, did you fix your problem?



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Dont think a vehicle this old has any security,unless someone has put a sunday mechaic system in and you dont know about it.Ask previous owners if it hads an alarm fitted that they knew about.Now i know it might sound daft but have you left a cable off the battery or starter motor ,that could run to the fuse box or something supplying power to make it run?? wouldnt be the first time evan a professional cowboy like myself has missed sonething stupid

Posted on Jun 29, 2009

  • Stig Tomta
    Stig Tomta Mar 30, 2014

    Hi, i have exactly the same problem, did you fix your problem



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i think you are saying that you crank it,it starts,then it goes dead over and over again?

or are you saying that you think the security system has disabled your engine?i have a '85 535i and a '84 528e i've had a different problem with the 535i and have just been driving the point being that i cant remember everything about the 535i but i can look and tell you where everything is if you dont know or cant find out.

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i dont think the security system would disable the engine like that as you say "locked" which could either mean the security system locked out the engine or that someone told you your motor is "locked up" and that cant be if it runs at all...

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