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Thread: new plugs & coil connectors

  1. #1
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
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    Default new plugs & coil connectors

    Replaced my Bosch plugs this weekend after 30,000 miles with Bosch Super Plus. The old plugs looked fine, just wear.

    However, I did replace my coil to spark plug connectors with new Bremi connectors I got from BMA. Big diffference. the car runs smoother and has much more low to mid range power. Better than just changing the plugs last time. I suspect the old connectors just got tired. Any thoughts/idea?
    Last edited by Russell; 07-05-2007 at 07:34 PM.
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  2. #2
    Join Date
    Mar 2006
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    East Brunswick, New Jersey
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    Default

    Could you provide a link to the connector? I have no idea what you are talking about. I though the coils connect to the wiring harness with nothing in between.
    '01 540it, 6/01
    '03 325i 5 speed, 9/02
    '10 535ix. 9/09
    '10 mini 6 speed
    '15 mini countryman 6 speed

  3. #3
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    Default

    I did not make my self clear. It is the rubber connector from the plug to the coil. see item 3 in the Realoem diagram.

    http://www.realoem.com/bmw/showparts...=12&fg=05&hl=6
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  4. #4
    TC535i Guest

    Default

    So you didn't change the coil pack, but just the rubber connecting neck?? I can't see how that would affect it, unless it was REALLY screwed up, corroded, bad connection, etc...

  5. #5
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    Default

    My thoughts as well. However, when I pulled the old connectors off the coils, some felt softer than others. One of the inner cores pulled out of the rubber insulator. After all they were 12 years old. I understand they can just become "tired".

    Also, the resistance appeared to be about 1.7 ohms on most of them, one was about 1.6 ohms. The new ones measured about 1,8 or 1.9 ohms per my new Sears digital multimeter. Have no idea what that means, execpt the resistance of the new connectors was slightly higher. DUH.
    Last edited by Russell; 07-05-2007 at 07:32 PM.
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  6. #6
    TC535i Guest

    Default

    Hm... maybe you were grounding out thru cracks in the rubber? Like a bad plug wire, I guess...

  7. #7
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    Default

    Maybe the old "tired" connectors had some hairline cracks that were allowing the high voltage to track along the connectors instead of going straight to the spark plug?

    The resistance differences you measured are just due to the variation in contact resistance between the leads of your digital multimeter (DMM) and the connectors - without fancy kit, you can't really measure resistance to 0.1 ohm accuracy. Also, it's quite common for HT leags to have kilo ohms of series resistance (in order to reduce interference to radios). Thus even resistance differences much larger than just an ohm or so wouldn't have affected the spark.

  8. #8
    Join Date
    Feb 2006
    Location
    Oldham, England
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    Default

    Maybe the springs in the old ones were weak/broken and not making proper contact with the plugs?
    Oct '00 E46 330i. Feb '92 525i (departed)

  9. #9
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    Mar 2004
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    Phoenix, AZ
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    Default OK - So, how much from BMA?

    Real OEM says about $15 ea.

    Inquiring minds want to know.

    JD

  10. #10
    Join Date
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    Location
    Antwerp, Belgium
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    Default

    Pelican parts lists them at 7$.
    What I'm wondering about is if you can just interchange these connectors on bosch and bremi coils?
    I remember reading somewhere that the connectors have different resistance readings and should be match to the same make of coil.

    Also, just out of curiosity I once tried to disconnect the connector from the coil on every coil I have and they either won't move or they turn but don't disengage, so how do you disconnect the properly?
    2008 audi A3 1.9tdi
    (former 1991 520i LPG)

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