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Thread: M10 engine knock comes and goes help diagnosing

  1. #1
    Join Date
    Jun 2017
    Location
    los angeles
    Posts
    52
    My Cars
    e21 320i

    M10 engine knock comes and goes help diagnosing

    Well i had a lous engine knock that developed couple days ago and need help diagnosing my 79 320i before i send it to a rebuilder

    I didnt over heat the engine nor did it ever turn on the oil pressure light ever and was running fine until i heard it knocking like a spray can coming off the freeway on a short drive. Although the car has had considerable blow by for almost a year now. The oil is clean and has no metal bits

    I tried disconnecting plug cables to see if the noise went away but it didnt. Also if i drive her for about 5 minutes it will go away and its more common at idle and it will go away randomly on its own sometimes. Use to be that i always hear it on cold starts then it would get better but now it's just random.

    I also changed the oil/flushed it just to see if it would improve and the knock isnt as common now.

    As a college student with limited resources and expertise im trying to rule out everything before rebuilding completely

    Btw does anyone make affordable pistons/rods for an m10 yet?
    Last edited by e21Luis; 01-11-2019 at 11:10 PM.

  2. #2
    Join Date
    Apr 2014
    Location
    DFW TX USA
    Posts
    1,447
    My Cars
    1983 320I, 1986 325E
    Find a E30 M10. They are still somewhat easy to find in Texas. There is a engine with 124k in dallas.

  3. #3
    Join Date
    Dec 2012
    Location
    topanga CA
    Posts
    483
    My Cars
    84 728i,325Ci, 77 R100RS
    Have you read the responses to your other post?

    https://www.qscusa.com/collections/b...stons-set-90mm

    Put 2 bottles of STP in there and go find a mechanic before you blow it up.

  4. #4
    Join Date
    Feb 2009
    Location
    District Nine
    Posts
    17,984
    My Cars
    sold 78 BMW 320i
    Does the engine oil light illuminate when the key is first turned on?

    When a head gasket is blown between two cylinders, it will make knocking noises too (extreme detonation).

    Are you able to post a video with good audio?
    Tbd

  5. #5
    Join Date
    Jun 2012
    Location
    Omaha NE
    Posts
    482
    My Cars
    1983 BMW 320i
    Maybe it's carbon knock? Could try Seafoam before you pull the engine.
    Last edited by msiert; 01-12-2019 at 09:56 PM.
    Murray

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