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  1. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Thanks all for thoughts on this. I just began some diagnosis. Have not adjusted EHA yet, but I did unplug it at operating temp and it idles absolutely smooth as can be. Misses on acceleration, but not much more than with EHA plugged in. Of course check engine light then turned on due to EHA...
  2. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Thanks HD - just to confirm below an EHA (have no idea if mine was adjusted) could indeed cause one or two cylinders to run lean also experience a rough idle? I have not yet trouble shoot the FD by removing lines and visually inspecting flow. Rebuilder is suggesting turning retaining collar by...
  3. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Had it rebuilt from a guy on Ebay. Based on reviews it seems he has been doing a good job. Looks like I will need to send it back.
  4. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Finally after differential issues (still not entirely solved) summer vacations and you name it, I have car back. Short story long is there were major vacuum leaks between intake manifold and all 8 O-rings and lower intake manifold gasket were replaced, I was not able to detect those issues with...
  5. Hello from a new W126 owner

    W126 S,SE,SEC,SEL,SD,SDL Class
    Gorgeous car Lesguy!
  6. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Heikkif- When you say "plug the Lamda adjustment" I am assuming you are referring to covering the opening that accesses the screw adjustment. If so it will keep debris from entering tube, but it will not do anything to the way the engine operates. Your issue could be one of many ranging from...
  7. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Thanks, I have looked for videos and also posts on adjusting duty cycle. I haven't found yet anything other then using a multi meter that measures duty cycle on the diagnostic ports. Could it be that easy?
  8. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Thanks and great video! Seems like best place to begin would be with EHA fuel pressure measurement then going about HD's recommended procedure. Need to procure proper fuel pressure gauge fittings next.
  9. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Thanks HD, I have reviewed all of posts previously mentioned above and feel confident there are no other ignition or fuel related issues other than restoring lambda adjustment to original settings with the unknown being previous potential EHA adjustment. Am I understanding correctly in that...
  10. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    After reading additional info is it even possible to bring car back to original settings if EHA and tower adjustment screw was changed or do I need to replace EHA before shop does fine adjustments on tower adjustment screw? Seems like if both have been adjusted (not certain again on EHS, but...
  11. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Yes thanks HD, I should have paid more attention to the tower, but I did not know what tamper proof cover looked like until researching. It became clear that it was previously removed and already adjusted unfortunately for me. I suspect this was done to pass am emission failure (recorded on...
  12. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Second update - can say now for certain after a few more miles I can say an adjustment is needed. Runs exceptionally well under throttle, but not the smoothest idle. I should have paid attention to.this, but it would appear as though the throttle mixture was adjusted previously correct...
  13. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Update - Finally received back Fuel Distributor and test results of my injectors. 6 of 8 injectors failed either leak down, trigger or spray. Old diaphragm also appeared to have a number of pin holes and was badly worn. Put FD back on, new injectors and rest of hoses etc back together last...
  14. 1984 380SE suddenly doesn't run

    W126 S,SE,SEC,SEL,SD,SDL Class
    Agreed, was just going to suggest pulling valve covers off to assess your situation if you heard strange valvetrain related noise. Can't remember what frequency is recommended on changing out timing chain for 380, but I believe it is more frequent due to single vs. double roller chains used on...
  15. Differential R&R a DIY job?

    W126 S,SE,SEC,SEL,SD,SDL Class
    Somehow those large allen bolts become almost welded in the unit! Not a bad idea next time to use impact gun, I think I'll try that especially as I have two extra now from the old differential just in case. . .
  16. Differential R&R a DIY job?

    W126 S,SE,SEC,SEL,SD,SDL Class
    Update on differential - After careful consideration including the possibility that there may be more issues than just the pinion bearing and if that was the case a ring gear/pinion would be very pricey, I opted to go with a used relatively low mileage one off of Ebay. I've been out of town for...
  17. W126 Road Trip Pictures

    W126 S,SE,SEC,SEL,SD,SDL Class
    Good looking car and sights except the traffic in second set of pics on way back towards Golden Gate Bridge. I may be a bit oversensitive to the 2 hr plus drive for 37 miles traveled that is the standard up here lol.
  18. Vacuum Check Valve?

    W126 S,SE,SEC,SEL,SD,SDL Class
    Part was brittle and broke, would you call this a Vacuum Check Valve?
  19. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Clicked on link, but was not able to tell what part is without a picture? Also on previous posting regarding tuning after re-installation I agree with you. Only potential tuning issue could be EHA however if all settings are same post assembly there should be no reason for adjustment.
  20. Temporary rough idle warm & cold after starting

    W126 S,SE,SEC,SEL,SD,SDL Class
    Update - I have decided to opt for a fuel distributor rebuild and fuel injector cleaning svc/test via Ebay. Today I removed fuel distributor and injectors on 90 420SEl with 87k miles for reference. Car is original Seattle bought life long resident so you can imagine based on our climate that...
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