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Thread: Does the Lambda relay always get hot?

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  1. #1
    Senior Member AugustneverEnds's Avatar
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    Does the Lambda relay always get hot?

    My D has been the recipient of a lot of electrical repairs in the past couple of days. Went out driving this morning and decided to stop and have a look around the relay compartment. The lambda relay was noticeably hot, hot to the touch not enough to burn my finger but hot nonetheless. Is this normal function?

    (Some background: replaced the alternator last week because the PO installed the last one incorrectly and caused the positive terminal to break. Replaced all of the changeover relays with DMCH's kit. Running a new lamp delay module. The car didn't seem to like the new RPM relay so still using the old one. Also want to give a shout out to DMCMW for their sterling advice which saved me a considerable amount of money
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12

  2. #2
    One of those purists you keep hearing about. sdg3205's Avatar
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    Is the FV buzzing? I noticed the same on my new project car, but the FV is not buzzing. I haven't dug into that system yet. It got hot within about 20 seconds.
    Dave

    Here, somewhere.


  3. #3
    Senior Member Bitsyncmaster's Avatar
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    Yes it is normal for the Lambda relay to get hot. It's just that the coil current is higher than the other relays (except the RPM relay which is even higher). That was the second relay I made solid state because like you, I felt around for hot components.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  4. #4
    Senior Member AugustneverEnds's Avatar
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    Quote Originally Posted by Bitsyncmaster View Post
    Yes it is normal for the Lambda relay to get hot. It's just that the coil current is higher than the other relays (except the RPM relay which is even higher). That was the second relay I made solid state because like you, I felt around for hot components.
    Ohhh I see, thank you Mr. Dave. I might buy one of yours then since I'd like to keep the relay compartment as cool as possible.
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12

  5. #5
    Senior Member Bitsyncmaster's Avatar
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    Quote Originally Posted by AugustneverEnds View Post
    Ohhh I see, thank you Mr. Dave. I might buy one of yours then since I'd like to keep the relay compartment as cool as possible.
    You can move one wire and use the standard relay in the Lambda location. I don't sell a solid state relay built for the stock wiring of the lambda socket.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  6. #6
    Senior Member JohnZ's Avatar
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    Probably this question has been already put around here, but... are there some tips to actually cool down the entire relay compartment?

    Maybe some different solution mixed together... replace wooden cover for example?

  7. #7
    Senior Member AugustneverEnds's Avatar
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    Quote Originally Posted by sdg3205 View Post
    Is the FV buzzing? I noticed the same on my new project car, but the FV is not buzzing. I haven't dug into that system yet. It got hot within about 20 seconds.
    Yep, FV is buzzing.
    Nick A.

    1988 BMW 325is
    1982 DeLorean DMC-12

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