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Thread: 320i vacuum lines

  1. #1
    Join Date
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    houston,tx
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    bmw e21

    320i vacuum lines

    man i cant find the vacuum diagram for the 82 engine 320i. everyones got 318s .even a pic would help.

  2. #2
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    should be under the hood someplace.
    Tom D

    77 e21 - m42
    88 e30m3
    04 330 dinan3
    84 r1000rt
    02 r1150rs
    all of them gray
    14 f800gsa - red headed stepchild!

  3. #3
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    Macungie, PA
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    1981 320i
    did you try realoem.com? if so and it didn't help, perhaps contacting a reputable BMW shop would be next. Mine offers lots of help with things of this nature.
    'Simplex sigillum veri'

  4. #4
    Join Date
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    District Nine
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    sold 78 BMW 320i
    There's not that many vac lines on a 1.8, I'm sure somebody here can explain where each one goes within 4 sentences

    Sorry OP, I only have pics and explanations for a 2.0.

    Oh - search result for you:
    http://forums.bimmerforums.com/forum...ghlight=vacuum
    Last edited by epmedia; 08-31-2013 at 07:10 PM.
    Tbd

  5. #5
    Join Date
    Jun 2005
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    Stratham, NH
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    1983 320i + 2014 M235i
    Both of my factory shop manuals, dated 01/80 and 10/81 only have the diagram for the 2.0 engine. There are other diagrams in them for the fuel system layout and electrical schematics, but curiously, there is nothing for the vacuum lines on the later cars.
    The same is true for the Haynes manual which includes a supplement for '80-'83.

    I know it's not what you are asking for, but maybe this 1978 hose layout diagram will be helpful in some way:



    Here's the underhood emissions sticker that Tom mentioned:




    And here's a photo like you asked for that might be helpful if you can make any sense of all that plumbing on the 1.8 engine:

    Last edited by dumbclub; 08-31-2013 at 09:00 PM.

  6. #6
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    old schiesse
    ^ I looked through my blue book as well and could not find a diagram for a late car



    ^ real owner of my cars

  7. #7
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    probably because there isn't any. according to the underhood sticker posted by john there's two. one for the ignition advance and one for the purge valve. there would also be one for the brake booster. what else? there was some kind of cold start retrofit that hangs on the firewall and has a relay, but I don't think there's vacuum involved.
    Tom D

    77 e21 - m42
    88 e30m3
    04 330 dinan3
    84 r1000rt
    02 r1150rs
    all of them gray
    14 f800gsa - red headed stepchild!

  8. #8
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    Quote Originally Posted by Tom D View Post
    there was some kind of cold start retrofit that hangs on the firewall and has a relay, but I don't think there's vacuum involved.
    Tom,
    Actually, there is a vacuum line that runs from the silver diaphragm (immediately above the air cleaner in my photo above) and runs up to the intake plenum (going through a white plastic reducer). It is parallel to my gold painted plenum support/post. It was part of that hard start retrofit kit (BMW Campaign 83E-A01).
    -John
    Last edited by dumbclub; 09-02-2014 at 10:56 AM.

  9. #9
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    old schiesse
    I guess there is an important question that hasn't been asked:

    OP, are you having a vacuum leak or are you just trying to do some preventative maintenance?



    ^ real owner of my cars

  10. #10
    Join Date
    Sep 2007
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    houston,tx
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    bmw e21
    I see the one line that goes from the distributor to the throttle body but the t-fitting that goes from the valve cover? This pic is the closest i have to actually seeing where it goes.motor01.jpg

  11. #11
    Join Date
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    e21, e30 m3. e46 330ci
    oh yeah I remember that one, we had quite a discussion here about it, but unfortunately I forget.
    Tom D

    77 e21 - m42
    88 e30m3
    04 330 dinan3
    84 r1000rt
    02 r1150rs
    all of them gray
    14 f800gsa - red headed stepchild!

  12. #12
    Join Date
    Sep 2005
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    monterey, ca.
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    e21, e30 m3. e46 330ci
    And by the way, that is not a vacuum line.
    Tom D

    77 e21 - m42
    88 e30m3
    04 330 dinan3
    84 r1000rt
    02 r1150rs
    all of them gray
    14 f800gsa - red headed stepchild!

  13. #13
    Join Date
    Aug 2017
    Location
    San francisco
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    27
    My Cars
    78' & 82' 320i, 99' 528i

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