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  #1  
Old 10-23-2002, 05:26 PM
wmartin9
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90 model mercedes 300sl trannie problem

Problem with 90 model Mercedes 300 sl automatic transmission 722-500 5 speed. This transmission starts off in second gear then shifts 3-4-5 if selector is in D range. Problem I am having is long 2-3 shift cold. After transmission finally makes 2-3 shift all other shifts seem to be fine. Now here is the CATCH even after unit is warm, turn key off just for 1-5 minutes, then start the engine and long 2-3 is right back until transmission shifts to 3rd then transmission shifts okay again. Any help n solving this problem would be greatly apprciated. Thank you.
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  #2  
Old 10-23-2002, 05:47 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The trans is designed to hold the shift only when cold!! There is a solenoid at the LEFT front of the transmission mounted to 2 small metal pipes, IF the wire becomes disconnected THEN............
AS long as it isn't a California version car, or the check engine light will come ON.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
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  #3  
Old 11-01-2002, 01:14 PM
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Join Date: Oct 2002
Location: Greensboro, NC
Posts: 25
Thanks for the suggestions. checked that solenoid...it's seems OK and no engine warning lights either.

Adjusted the Bowden cable a few turns.

Problem still around...sticking, or long shift between 2 - 3 shift.
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'90 300SL
'90 190E 2.6
'87 300TE (gone to car heaven)
'84 190D (passed along...still in the family and used on a daily basis)
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  #4  
Old 11-29-2002, 10:54 PM
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Join Date: Oct 2002
Location: Greensboro, NC
Posts: 25
delay 2 -3 upshift defeat?

MB DOC,

I have been out looking at this solenoid again to make sure it was checked correctly.

I am presuming that there must be a way of testing this solenoid and the sensors that triggers this action?

The tranny seems to work as designed after the initial delay. That is: the delay is not present on subsequent 2 -3 shifts so long as I do not switch off the ignition.

If I switch off for longer than about 5 seconds, the car/tranny seems to "forget" that it has just been working fine, and reverts right back to this long 2 - 3 delay....EVEN IF THE CAR AND TRANSMISSION IS REALLY HOT.

I feel that there must be some sort of timing circuit or flag that is being reset everytime I switch off the ignition.

I can see the delay box on the driver's side of the tranny with a cable coming up to an area under the airfilter. There appears to be a connector block in this area at the Airfilter.

If I unplug this cable, should this effectively defeat the delay mechanism?

If this does not affect the incorrect delay operation, where should I look for the next clue?

Also, how does one get to this delay solenoid if I wanted to replace it? It seems the only way is from the bottom...are there any gotcha's I need to keep in mind when doing this?
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Don

_______________
'90 300SL
'90 190E 2.6
'87 300TE (gone to car heaven)
'84 190D (passed along...still in the family and used on a daily basis)
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