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94 E320
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Who on this forum really knows how to diagnose this problem? I did a search and there is never any real information provided for this issue. Has anybody on this forum troubleshot and fix this problem to prevent the Check Engine Light from coming on? (I really don't care if the delay works or not - I just want the light to stay off - Is there a by-pass procedure?)
 

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'87 W124 300TD, '85 W123 280E
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113 Posts
Who on this forum really knows how to diagnose this problem? I did a search and there is never any real information provided for this issue. Has anybody on this forum troubleshot and fix this problem to prevent the Check Engine Light from coming on? (I really don't care if the delay works or not - I just want the light to stay off - Is there a by-pass procedure?)
Well, you can clear the code every once in a while.

My car is also afflicted by this and I would like to know what to do. Just came back again this morning. I don't really feel like it is a problem from a daily driving point of view, but obviously I would like to see everything sorted well.

Anyone have any ideas?:confused: What does the "upshift delay" actually do?
 

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The upshift delay is a 'feature' which hold the car in low gears longer, after cold starts, to aid the catalytic converter in warming quickly.

This is all it does.

It truly bugs me in my wife's RX300, because it's horribly obvious. I'm quite happy it does not work in my 124. Saves fuel, too, IMO.

I'm resigned to the fact I'll just have to reset the light, monthly. So it goes. The vacuum devices which control this are near the fuse box, IIRC, and they are the two small mushroom cap-looking things which fail due to age. They won't hold a vacuum, which is how this 'feature' is controlled.
 
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