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Thread: 1979 735i back on the Road

  1. #1
    Join Date
    May 2011
    Location
    Denmark
    Posts
    72
    My Cars
    520d G30

    1979 735i back on the Road

    Hi,

    This summer I will try to get my car back on the road. Yesterday we worked with and serviced the car.

    After a oil change with 15w40 I noticed that the oil lamp are really slow to turn off and if you push the test button while driving the test lamp are flickering. I have a e32 where the problem with the pressure were the oil canister but the E23 has a different design.

    What are the first step to get the lamp to turn off more quickly?
    Attached Images Attached Images
    Last edited by mop007; 07-16-2017 at 07:12 AM.
    1991 E32 750IL Highline Individual
    1987 Alpina B11

  2. #2
    Join Date
    Mar 2013
    Location
    USA
    Posts
    465
    My Cars
    E21/early e23/e34
    Nice car- Need more information, how long does it stay on, cold engine or warm engine, high miles or not???

    Most likely it's the oil pressure sensor at the back of the head, passenger side (single blade) these are known to fail. Very easy to replace and cheap, the oil pumps on the M30 motors are pretty stout and don't fail very often.

    I'd also rethink the oil you're using, these older BMW motors need to be run with the "dino" oil, has good amounts of zinc which is needed for engine wear protection, lots of info if you search.

    Post more images and details of the car, I also have a '79 e23 and would be especially be interested in engine bay images.
    Last edited by kojo96; 07-16-2017 at 12:00 PM. Reason: mistake

  3. #3
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i
    Hey, that sticker shows a 'Dog Leg' trans...is this in your car???
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  4. #4
    Join Date
    May 2011
    Location
    Denmark
    Posts
    72
    My Cars
    520d G30
    This week I finally found time to change the brake booster - not so complicated as first expected but the bomb must wait for winter! Next thing is the brake fluid and to spare my marriage I have ordered a electric pump so I can tackle the job alone!
    The oil pressure sensor is lying and waiting to be changed..

    The seller I got the car from has this video on youtube of my car. I have though upgraded to leather that I found and picked up in Holland.

    1991 E32 750IL Highline Individual
    1987 Alpina B11

  5. #5
    Join Date
    May 2011
    Location
    Denmark
    Posts
    72
    My Cars
    520d G30
    Could not resist installing one of the new French headlamps. Looks okay - right? :-)

    IMG_0436.jpgIMG_0437.jpg
    1991 E32 750IL Highline Individual
    1987 Alpina B11

  6. #6
    Join Date
    Mar 2006
    Location
    Sacramento, CA
    Posts
    935
    My Cars
    87 535i/84 €735i/8
    Good looking car.
    --Jay3->Sic gorgiamus allos subjectatos nunc
    84 €735i manual, 88 528e/i
    Motronic 1 and 1.3 wiring
    Transmission & Diff gearing sheet

  7. #7
    Join Date
    Jun 2012
    Location
    Northern Ireland
    Posts
    8
    My Cars
    E23 732i E38 740 Z3 3.0
    Quote Originally Posted by mop007 View Post
    Hi,

    This summer I will try to get my car back on the road. Yesterday we worked with and serviced the car.

    After a oil change with 15w40 I noticed that the oil lamp are really slow to turn off and if you push the test button while driving the test lamp are flickering. I have a e32 where the problem with the pressure were the oil canister but the E23 has a different design.

    What are the first step to get the lamp to turn off more quickly?
    It's not a problem, as long as the light goes out. There are two pressure switches on these engines, and when the same thing happened to mine, I got my local BMW garage to swap them out. it didn't solve the problem, so the only thing left was the oil pump. Swapped it out, and the problem remained. The following month, I picked up BMW Car magazine, which had a feature on the E23, and it actually referred to the lazy oil light, and said it was nothing to worry about. I was £300 poorer, and to think that the BMW garage didn't already know about it!

  8. #8
    Join Date
    May 2011
    Location
    Denmark
    Posts
    72
    My Cars
    520d G30
    Thank you.. It is a pain to look at the oil lamp until it turns off :-)
    1991 E32 750IL Highline Individual
    1987 Alpina B11

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