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#1
08-27-2009, 01:13 PM
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Transmission problem
My transmission switched hard under heavy acceleration and is starting to misbehave. It is on my 97 E420 with 165k.
Any idea how much of a problem, expense, I am facing? Any advice?
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2008 S550 2010 GLK350 1997 E420 (retired) 2005 CLK500 (retired) 
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#2
08-27-2009, 03:19 PM
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First step is to service ATF and filter if it hasn't been done within the last 60K miles. If issues persist after that, have vehicle hooked to SDS and trans data read...
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#4
08-27-2009, 09:43 PM
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Was there an inordinate amount of sludge or metal in the pan when you changed it out? Skipping the TC leaves about 4 of the 8 liters in there. Did you use the correct ATF when you serviced it? How has it behaved for the last 20K?
On a side note, how old is your AMM (MAF)?
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#5
08-28-2009, 02:07 PM
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Have you checked the level of the trans fluid? If the level is on the low side you might want to check if the electrical connector on the trans is leaking. On my E320 this caused the trans fluid to wick-up from the electrical connector to the trans computer board through the wires. The fix is to replace the o-rings on the electrical connector, clean the circuit board if it is wet from the trans fluid and bring the trans fluid level to the correct level.
If your torque converter has a drain plug then I would have changed the fluid out when you did the filter change.
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Ray 1998 Mercedes E320, 200K Miles 2001 Acura 3.2TL, 178K Miles 1992 Chevy Astro, 205K Miles
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#6
08-31-2009, 01:47 PM
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I ordered a new plug as well as oil. I will change the torque converter oil as well and get everything back to optimum and then see...
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2008 S550 2010 GLK350 1997 E420 (retired) 2005 CLK500 (retired)
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#7
08-31-2009, 02:23 PM
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Also, like I asked before, are there any other driveability issues? My M104 experienced some tranny slamming and erratic shifting before I replaced the AMM. Replacing it restored normal operation.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#8
09-01-2009, 10:56 PM
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The Mass air sensor was replaced about 6 months ago, no problems. I will change all fluids (including the converter) and hope for the best. It down shifts fine, and up****s fine under 3000 rpm. For higher rpm shift, I get a harsh engagement. It seems strange to me. No slipping, no other apparent problems. Just does not like to shift at higher rpms...
__________________
2008 S550 2010 GLK350 1997 E420 (retired) 2005 CLK500 (retired)
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