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Thread: E23 misfire

  1. #1
    Join Date
    Sep 2020
    Location
    Fort Collins, CO
    Posts
    4
    My Cars
    1982 BMW 733i

    E23 misfire

    We have an 82 E23 that runs beautifully for about 45 minutes then misfires, chugs and sputters. After 15 minutes of tinkering....it runs beautifully again.
    Any ideas?

  2. #2
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    Moved to E23 forum.
    Did you already test coolant temperature sensor and air temp sensor? Because these feed the engine control unit.
    Last edited by shogun; 09-16-2020 at 11:40 PM.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
    Join Date
    Oct 2007
    Location
    Valley Village, CA
    Posts
    624
    My Cars
    1985 745i

    E23 misfire

    What kind of tinkering are you doing?
    When your enemy is making a mistake, do not interrupt him.

  4. #4
    Join Date
    Sep 2020
    Location
    Fort Collins, CO
    Posts
    4
    My Cars
    1982 BMW 733i
    Quote Originally Posted by shogun View Post
    Moved to E23 forum.
    Did you already test coolant temperature sensor and air temp sensor? Because these feed the engine control unit.
    We have not. How would you test those... or do we just replace them?

    - - - Updated - - -

    Quote Originally Posted by yert315 View Post
    What kind of tinkering are you doing?
    Nothing really...point was regardless of what we do it seems to be better...for 45 minutes

  5. #5
    Join Date
    Sep 2020
    Location
    Fort Collins, CO
    Posts
    4
    My Cars
    1982 BMW 733i
    We have not. How would you test those... or do we just replace them?

  6. #6
    Join Date
    Oct 2007
    Location
    Valley Village, CA
    Posts
    624
    My Cars
    1985 745i
    You should have a coolant temp sensor, a thermo time switch, and I believe one other sensor that may sense coolant temp to adjust fueling. All right up on the thermostat housing. That’s where I would look first.

    P.S. your engine is the same as some early e28 cars. There may be more mechanical info on fixings over on mye28 you can dig through
    When your enemy is making a mistake, do not interrupt him.

  7. #7
    Join Date
    Sep 2020
    Location
    Fort Collins, CO
    Posts
    4
    My Cars
    1982 BMW 733i
    Thanks... we'll look into that

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