On my 95 S320, I've noticed recently that the transmission upshift delay that keeps it in a lower gear when the engine is first started cold, doesn't hold it in the lower gear as long as it used to.

It's been colder here recently, and I would have thought that the upshift delay would delay longer - not shorter.

To test this I intentionally drive slow enough so as not to force it to upshift, and I travel about 1/3 the distance that it used to take before it first upshifts. The next few shifts are kind of rough too - which I attribute to a not-quite-warmed-up transmission.

Any thoughts on what might be going on?

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Dave

1995 S320