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Thread: Help Guys, in limp mode my brain is fried

  1. #61
    Senior Member jaymanek's Avatar
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    Re: Help Guys, in limp mode my brain is fried

    Thanks... Yes the NSS was replaced by me last week. I checked actual values on Star afterwards, all was ok.

    The only thing I noticed was that I didnt like how the black arm on the NSS fits onto the selector lever. No real lock or clip to keep it from sliding backwards. Not likely to happen i know but not very Mercedes either.

    I didnt notice any play in the linkages but access is tight so ill check again.

    In fact the whole transmission may be coming back out soon anyway as I have an annoying ATF leak... Annoying because the transmission was totally overhauled by someone I trust to do it right. Yet there is a leak and I cant see where it is coming from.

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  3. #62
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    Re: Help Guys, in limp mode my brain is fried

    Jay, most trans leaks can be fixed without pulling the trans out of the car... exceptions are the front pump seal and converter seal.

    The NSS lever has a black hollow protrusion that fits into a hole in the metal selector shaft lever. These should be tightly clamped and not able to slide anywhere. And, the NSS has to be adjusted with a 4mm wire/pin through the hole, before tightening down the 2 bolts that clamp the switch body to the tranny.

    FSM procedure:
    http://124performance.com/docs/mb/tr...itch_R+R_1.pdf



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  5. #63
    Senior Member jaymanek's Avatar
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    Help Guys, in limp mode my brain is fried

    Ahh I didnt do that 4mm locating tab part... ill check this tomorrow. Thanks for that!

    Im also wondering if my shift lever may be bent, as I recall it looking a different shape to those pictures. Ill check..
    I have a spare transmission from a W126 sitting here so can steal the lever from that one if needed.

    If this is the fault, it makes sense. I never had code 7 with original ETA fault. Whilst waiting for the new ETA, I replaced the NSS. I guess if I didn’t set it up correctly it would explain my new code 7.
    Although even with the two 10mm bolts loose, there really wasn’t much “adjustment” in the position of the switch..
    Last edited by jaymanek; 05-08-2018 at 01:14 PM.

  6. #64
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    Re: Help Guys, in limp mode my brain is fried

    Yep, super-critical that the switch be properly aligned with the 4mm drill bit or allen key before cinching it down. If not, things won't work correctly. Even 1 mm out of alignment can affect things.

    HOW-TO: https://www.500eboard.com/forums/showthread.php?t=325

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  8. #65
    Senior Member jaymanek's Avatar
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    Re: Help Guys, in limp mode my brain is fried

    The NSS was not aligned... I have done this and hopefully that was the cause of the issue. Time will tell! Thanks to everyone for the support thus far.

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  10. #66
    Senior Member jaymanek's Avatar
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    Re: Help Guys, in limp mode my brain is fried

    Hi All, Just to update...Not had limp since I adjusted the NSS. I guess that was the problem.

    I did however get ASR warning a few times. A code read brought up brake switch, already new. I fitted another new switch. After fitting I realised I had no brake lights at all!
    Later I found they were intermittent.
    Then later that day the instrument cluster went dead totally....
    I realised this had to be some other voltage issue.
    Both brake switch and cluster are fed from same fuse... Guess what, I had used all new aluminium fuses, already corroding! Replaced fuse and no problems since.
    New copper fuses on order.

    Now the only thing left to iron out is the Trans leak. I really cant understand it. It seems like its weeping from gasket but its not.
    It only leaks after a drive. It will leak for a while when coming to astop. Then it stops until the car is driven again.

    I thought it was from the breather but its all dry up there.

    I can see some fluid around the top of the kickdown cable actuator, but that doesnt make sense?!

    Im going to try cleaning the area and covering it in Talcom powder to try and trace the source.
    Problem is, its extremely tight up there, very difficult to see anything, even with my snap on borescope camera.

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  12. #67
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    Re: Help Guys, in limp mode my brain is fried

    Jay, have all the codes remained exorcised since adjusting the NSS and replacing the brake switch?


  13. #68
    Senior Member Eno's Avatar
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    Re: Help Guys, in limp mode my brain is fried

    What is the root cause for no brake lights after you replaced the brake switch behind the pedal.


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