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Old 10-11-2019, 07:10 PM
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Question 1987 300TDT Wagon transmission slipping and no power at slow speed when cold.

Is there any correlation between slipping transmission and lack of power at slow speed? When I leave my house everyday the car has to climb a small stretch then the road levels out. It is not steep at all but it always struggles to do the 200' or so. I floor the pedal but it moves gingerly. It is much better when the car is at temperature doing the same stretch. The car has good power on the freeway, doing 80+ mph with ease. Is there anything I can check or measure to see why? The transmission is definitely slipping as it hesitates to shift or shift at high rev. Any ideas are welcome.
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Old 10-11-2019, 07:16 PM
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Low transmission fluid comes to mind. It expands when warm and probably just meets the minimum level.

How long since the last transmission drain, filter and refill?

That vintage had a no maintenance (sealed for life) recommendation from MB. That has since been changed to a service every 40-60,000 miles.


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Old 10-11-2019, 07:46 PM
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Quote:
Originally Posted by SkippyJasper View Post
Low transmission fluid comes to mind. It expands when warm and probably just meets the minimum level.

How long since the last transmission drain, filter and refill?

That vintage had a no maintenance (sealed for life) recommendation from MB. That has since been changed to a service every 40-60,000 miles.


Sent from my iPad using Tapatalk
Transmission fluid level had been checked and is at level.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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Old 10-12-2019, 10:12 AM
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Quote:
Originally Posted by SkippyJasper View Post
Low transmission fluid comes to mind. It expands when warm and probably just meets the minimum level.

How long since the last transmission drain, filter and refill?

That vintage had a no maintenance (sealed for life) recommendation from MB. That has since been changed to a service every 40-60,000 miles.


Sent from my iPad using Tapatalk
The sealed for life transmissions came out in 1998
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Old 10-14-2019, 12:02 AM
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When I had that slipping when it was cold on the 84 300D changing the Filter and fluid cured it for about 1 year then my B2 piston broke.

Also even if you have the updated B2 piston and the updated nylon bushing for the B2 piston to slide on there is still a Lip Seal that has been there since 1987.

In the pic the B2 piston is removed and you see the seal and behind the seal is an amber colored ring that is the old type aluminum bushing that is replaced by a nylon one.
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1987 300TDT Wagon transmission slipping and no power at slow speed when cold.-b2-piston-seal-old-style-bushing.jpg  
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Old 10-14-2019, 01:48 AM
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Originally Posted by ah-kay View Post
The transmission is definitely slipping
Hook up a T fitting on the line going to the vacuum modulator so that you can run a vacuum gauge into the car and observe what it's doing while you push the pedal. Also check that vacuum connection and report back.

Quote:
Originally Posted by ah-kay View Post
Is there any correlation between slipping transmission and lack of power at slow speed?
bowden cable - regulates transmission shift point
vacuum modulator - regulates shift quality

I don't see how any of these two can have an effect on engine output since it's a mechanically controlled tranny (unless bowden cable is stuck and holding the linkage but you would feel that in the pedal)

Another possibility is that something binds up or a clutch pack engages in the transmission causing drag when it's cold (there is a check for that)
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Old 10-14-2019, 10:17 AM
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Quote:
Originally Posted by ah-kay View Post
When I leave my house everyday the car has to climb a small stretch then the road levels out. It is not steep at all but it always struggles to do the 200' or so. I floor the pedal but it moves gingerly. It is much better when the car is at temperature doing the same stretch.
Is the RPM high and the car fails to pick up speed during this event? If not, the trans is NOT slipping. It's in the wrong gear, you have fueling issues, or your turbo is a POS and doesn't spool until it the oil gets hot.

Delayed shifts, or shifting at stupid high RPM is due to the bowden cable being too tight. WOT shifts leaning on the downshift button should be ~4600 RPM. Normal WOT upshifts should be somewhere around 4100 RPM. I went through similar issues with my SDL.
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Old 10-14-2019, 04:39 PM
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I concur on the turbo issue. And in particular the cat converter. I have had experience with them clogging more cold than hot when they are getting older. I would check all vacuum lines as well. Sometimes they act differently cold to hot.
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