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#1
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W126 560 Cold performance issue...
I had this same issue last fall/winter. Then spring brought warmer temperatures and I forgot about it. Over summer the car ran well and I found some small issues. Economy and performance are way up from when I first had the car.
Then it got cold here. The same issue is back. The car feels like its hanging onto gear changes too long. Or it feels like the timing is being held back. At high RMP, just before a shift, I can feel surging. Feels like the trans is slipping. Its very, very annoying. the car simply feels "wrong". The odd thing is that most of the time I can just restart the car and its find. Even if I dont let it warm up much at all. I can get in, fire it up, back out and restart and I usually dont have the issue. If I do not restart, I will 99% of the time. Or if I stomp on it hard, it may then act normal again. But not always doing that and I dont like doing it. There must be something related to temperature that sticks open/closed. My thought it something that may be vacuum related, hence restarting drops vacuum for enough time to reset it. Or getting the RMP way up sometimes helps. Really clueless on this one. I just dont want to go through another winter like this. Ideas?
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#2
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How are the vacuum modulator and bowden cable for the tranny?
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280 |
#3
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Bowden cable seems okay. Shifts seem to be when they should be. But I have no other Benz to compare. The modulator was replaced last fall and the vac line to it was replaced by the PO, so its also fairly new.
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1991 560 SEL / 185k miles 1992 750il / 17k miles - project car |
#4
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That sounds familiar from my 560sel, but i can't visualize what i was working on and thought solved it--cold start valve?? Cylindrical thing in front of the air cleaner housing if i recall correctly. Might not have been it at all...sorry.
But...in the fall/winter in all our vehicles over the past several years, we've dropped performance and fuel economy. I've heard rumors of "winter formulation" gasoline, perhaps with a touch of alcohol, but have not been able to verify that. I can say that in the winter months if i put a bottle of Techron in a fill-up it makes my car run like it's spring-time. Good luck!!
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Earl McLain '02 C230 Kompressor '89 560 SEL "Frau BlueCar" (retired April 2004) |
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