Sticky change from 2nd to 3rd
04-02-2003, 05:55 AM
#1
Newbie
Thread Starter
Join Date: Apr 2003
Location: Australia
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
1992 W140 SE 300
Sticky change from 2nd to 3rd
I have a 1992 300SE, 206,000KS and in great nick,as they have been open road k's.
But, some mornings when setting off (say one in 3) the transmission doesn't want to shift up from second to third, can take up to 300 to 400 meters before it gets into third.
Never ever happens when warm, and when going never reoccurs, and the rest of the shifts are Fine. The transmission is fine and has just been serviced and was clean as a whistle.
I live in the Tropics in Australia and it doesn't get below 24c overnight either.
Any common faults to look for??
But, some mornings when setting off (say one in 3) the transmission doesn't want to shift up from second to third, can take up to 300 to 400 meters before it gets into third.
Never ever happens when warm, and when going never reoccurs, and the rest of the shifts are Fine. The transmission is fine and has just been serviced and was clean as a whistle.
I live in the Tropics in Australia and it doesn't get below 24c overnight either.
Any common faults to look for??
04-02-2003, 10:13 AM
#2
Newbie
Join Date: Jan 2003
Location: Nantes (France)
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
W140 S300 TD
Not sure but I always have noticed that both my W124 and W140 do the same every day. I think it's because the gearbox fluid is not at the standard service temperature.
How many rpm does it take to shift ?
Because the phenomenon have to be almost imperceptible.
How many rpm does it take to shift ?
Because the phenomenon have to be almost imperceptible.
04-29-2003, 10:13 PM
#3
Super Member
This is normal operation. I read about it in the owners manual. This is so the catalytic converter heats up faster. If you go over 31 MPH or so, it will shift.
04-30-2003, 01:33 PM
#4
Member
Join Date: Dec 2002
Location: Pittsburgh, USA
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
1995 S420
Re: Sticky change from 2nd to 3rd
This behaviour is absolutely normal. It ensures that the engine gets to operating temperature much faster, thereby being most fuel efficient. No cause for concern at all.
Originally posted by BRISTLE
I have a 1992 300SE, 206,000KS and in great nick,as they have been open road k's.
But, some mornings when setting off (say one in 3) the transmission doesn't want to shift up from second to third, can take up to 300 to 400 meters before it gets into third.
Never ever happens when warm, and when going never reoccurs, and the rest of the shifts are Fine. The transmission is fine and has just been serviced and was clean as a whistle.
I live in the Tropics in Australia and it doesn't get below 24c overnight either.
Any common faults to look for??
I have a 1992 300SE, 206,000KS and in great nick,as they have been open road k's.
But, some mornings when setting off (say one in 3) the transmission doesn't want to shift up from second to third, can take up to 300 to 400 meters before it gets into third.
Never ever happens when warm, and when going never reoccurs, and the rest of the shifts are Fine. The transmission is fine and has just been serviced and was clean as a whistle.
I live in the Tropics in Australia and it doesn't get below 24c overnight either.
Any common faults to look for??
05-02-2003, 10:40 PM
#5
Member
Join Date: Mar 2002
Location: Southern California
Posts: 180
Likes: 0
Received 1 Like
on
1 Post
93 300E
Exactly.
This is called the upshift delay valve, and it delays the shift from 2nd gear to 3rd gear when the car is cold. By keeping the engine in 2nd gear a little while longer, it warms up the catalytic converter quickly to reduce smog emissions. A cold cat doesn't work effectively at all.
This is called the upshift delay valve, and it delays the shift from 2nd gear to 3rd gear when the car is cold. By keeping the engine in 2nd gear a little while longer, it warms up the catalytic converter quickly to reduce smog emissions. A cold cat doesn't work effectively at all.
