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Thread: Several Symptoms; Could they Point to A Central Cause?

  1. #1
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    Several Symptoms; Could they Point to A Central Cause?

    Our 7-86-built 325e (unmodified condition) has several drivability issues. It is hard to start, lacks power and often hesitates, misses and stalls.

    Could all of these symptoms point to a central cause? Incidentally, the cold-start injector was replaced several months ago.

    Jeff
    1984 320i Baur TC2 5-Speed Opalgrün (Jeff's)
    1987 325e Sedan A/T Zinnoberrot (Dawn's)
    1984 633 CSi 5-speed Bronzit (Ours . . . if she says so)


  2. #2
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    323i E30 is offline ⅂!ʈө !ƨ l!ʞө ɐ ʇөlөbµouө
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    What’s the condition of your cap & rotor? Maybe the contacts are worn to the point that it’s barely transferring spark.
    It’s an easy check.

    Fuel pressure may be worth checking too.
    ^ true story



    D̶i̶b̶s̶ ̶o̶n̶ ̶t̶h̶e̶ ̶E̶2̶1̶

  3. #3
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    Check your spark plugs for condition as well as the distributor cap and rotor.

    Check your fuel pressure as your fuel pump may be failing

    Check the intake tract for cracks/leaks.

  4. #4
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    Thanks, guys; I'll check out the ignition system. Question: how many ohms resistance should the plug wires have?

    The Bosch fuel pump was new two years ago.

    Jeff
    1984 320i Baur TC2 5-Speed Opalgrün (Jeff's)
    1987 325e Sedan A/T Zinnoberrot (Dawn's)
    1984 633 CSi 5-speed Bronzit (Ours . . . if she says so)


  5. #5
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    check or replace all the intake and vacuum hose rubber.

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    Step 1- smoke test, make sure the engine is sealed.

  7. #7
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    Thanks, 82eye.

    Jeff

    - - - Updated - - -

    Thanks, sienayr.

    Jeff
    1984 320i Baur TC2 5-Speed Opalgrün (Jeff's)
    1987 325e Sedan A/T Zinnoberrot (Dawn's)
    1984 633 CSi 5-speed Bronzit (Ours . . . if she says so)


  8. #8
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    Quote Originally Posted by BMWtyro View Post
    Thanks, guys; I'll check out the ignition system. Question: how many ohms resistance should the plug wires have?

    The Bosch fuel pump was new two years ago.

    Jeff
    According to the Bentley Manual:

    Spark plug end connectors should have 5000 + - 1000 ohms resistance

    Distributor cap connectors including coil wire ends should have 1000 + - 200 ohms

    Wire itself - nearly 0 ohms

    Rotor should have 1000 + - 200 ohms

  9. #9
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    Thanks, 95BMWIC. When you say "spark plug end connectors" and "distributor cap connectors", are you referring to the end terminals crimped directly to the wires? If so, I'm not sure how one would test them individually. I can simply test both terminals simultaneously and I should get an aggregate resistance which should be somewhere around 1,500 ohms, yes?

    Jeff
    1984 320i Baur TC2 5-Speed Opalgrün (Jeff's)
    1987 325e Sedan A/T Zinnoberrot (Dawn's)
    1984 633 CSi 5-speed Bronzit (Ours . . . if she says so)


  10. #10
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    This is how I understand it (and have tested it)

    probe the spark plug wire from plug end connector to the other connector at the distributor 5000 + - 1000 ohms resistance

    probe the coil wire from the coil connector to the other connector at the distributor- 1000+- 200ohms
    1974 Fiat 124SC
    1981 Porsche 911SC
    1990 BMW 325IX, 1991 BMW 325IC, & 1991 BMW 325I
    2002 BMW 325I
    2012 BMW X3

  11. #11
    Join Date
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    Thanks!

    Jeff
    1984 320i Baur TC2 5-Speed Opalgrün (Jeff's)
    1987 325e Sedan A/T Zinnoberrot (Dawn's)
    1984 633 CSi 5-speed Bronzit (Ours . . . if she says so)


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