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Transmission refuse to shift up in morning

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Transmission refuse to shift up in morning

 
Old 12-20-2012, 11:29 AM
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2013 Black C250 Sport+
Transmission refuse to shift up in morning

This is weird but since the weather got colder in NY I've been having shifting issues with my 2013 C250. Whenever the engine is cold, the third gear refuse the shift up until it hits a little more than 3000 rpm. I am basically feathering the throttle, and the engine keeps on revving to 3000 rpm. All other shifts happens about 2000 rpm. Only in cold weather, before the engine warms up. But once it shifts at 3000 rpm on the third gear all the rests of shifts happen normally. May be tranny fluid not flowing right until third gear shifts or something? Not annoying enough to take it to the dealer but I thought it was WEIRD!
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Old 12-20-2012, 12:33 PM
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I have the same issue, however, not with third gear only but also 2nd. I suppose this is for warming up the engine...
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Old 12-20-2012, 02:38 PM
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This happened on both my first and my second coupe. It's really annoying but you can probably manually shift it up if you like.
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Old 12-20-2012, 11:17 PM
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~ happen to me once... but the car would not downshift on the freeway. turned the car off and on and things reset as normal.
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Old 12-21-2012, 12:09 AM
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2012 c250 Coupe
Originally Posted by dol4er View Post
I have the same issue, however, not with third gear only but also 2nd. I suppose this is for warming up the engine...
I get this on cold mornings too, but goes away after car warms up.

Quote from page 128 of manual:

"Upshifts take place at higher engine speeds after a cold start. This helps the
catalytic converter to reach its operating temperature more quickly."

Page 127:
"The catalytic converter preheats for up to 30 seconds after a cold start. The sound of the engine may change during this time."

I knew pdf of the manual would come in handy one day haha
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Old 12-21-2012, 02:58 PM
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Yeah, what Kevin said. Its not an "issue" rather just an annoyance due to big brother and cars needing to meet emission standards. Catalytic converters don't really start to "work" until they are warm, so the car keeps RPM's higher on cold starts until cat temps are within operating range. I usually let my car idle until RPM's drop to normal ranges on cold starts. But if you drive off before its warmed, you get unpleasantly rough shifts at higher than normal RPM's.
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