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Thread: Can someone help me identify this plug on the engine harness?

  1. #1
    Join Date
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    1990 BMW 525i, 97 Z3

    Can someone help me identify this plug on the engine harness?

    I was replacing the CCV and a few vacuum hoses. I installed a new oil separator so I removed the throttle body to give myself access. In the attached picture there are three connectors (2) have loom and one does not. I know that the two in the loom go to the purge valve and throttle position sensor but for the life of me I do not recall taking the third one off. I have checked carefully but do not see anyplace it would go. Thank you in advance.

    IMG_1560.jpg
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    Last edited by no1pony; 03-21-2017 at 09:03 PM.

  2. #2
    Join Date
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    ...it depands
    Since you mentioned that you can't locate the plugs, my best guess would be either IAT or ICV because they are both hidden under the intake manifold. Hope that helps...
    2000 Z3 M Titanium Silver / Imola Red+Black Nappa
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  3. #3
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    1997 BMW Z3 1.9L 5MT
    If a 4-cyl, the cam position sensor has an un-loomed cable with a connector that plugs in under the lower intake manifold. Have to remove the upper intake (maybe what you called throttle body) to get to it. Connector shown in Step 6 in:
    https://www.bimmerforums.com/forum/s...8#post23999678
    Last edited by Vintage42; 03-22-2017 at 07:00 AM.
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  4. #4
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    1990 BMW 525i, 97 Z3
    Sorry I should have mentioned it was a 6 cylinder. When I get home tonight I'll look some more. I'm sure it's something I'm doing wrong but I really do not remember undoing that connection.


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  5. #5
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    Intake Air Temp IAT, about center of the manifold, and positioned straight up and down.

  6. #6
    Join Date
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    Quote Originally Posted by Randy Forbes View Post
    Intake Air Temp IAT, about center of the manifold, and positioned straight up and down.
    Thank you. I bet that's it. I'll check tonight.


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  7. #7
    Join Date
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    1990 BMW 525i, 97 Z3
    I just want to say thank you to those who replied. It was in fact the connection for the IAT.


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