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#1
11-04-2009, 11:15 PM
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Partial throttle tranny slip
This started after my indy said my transmission was "shifting a little rough...I will adjust it".
I'm not sure what he did exactly, but I'm guessing the modulator? It sort of hangs at the rpm before shifting, or it slips at 3/4 throttle. At full throttle it does not slip. I have adjusted my throttle linkage and it made no difference to the problem, only changed where in the rpm range it shifted at. It still hangs for 1-1.5sec at whatever rpm before shifting. Does it sound the vac mod or something else? I never had any issues prior to whatever he did. If it is the VM, is this something I can do myself or should I really go to someone else to have them correctly adjust it? Thanks, Robert
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k 
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#2
11-06-2009, 08:43 AM
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Control pressure cable controls WHEN the trans shifts & the modulator controls how HARD.
Get the modulator re-adjusted to cure the slippage.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
11-06-2009, 02:45 PM
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Quote:
I read that turning it clockwise raises the presure and going counterclockwise lowers the pressure, is that correct? Does it sound like my pressure is too low?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#4
11-06-2009, 03:44 PM
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MB's Vacuum control of Transmissions mimics ...
A Gasser's/Petrol engine manifold Vacuum.
So, @ WOT the least vacuum is presented to the transmission. All of what I know about Tranny/Vacuum issues is a Mis-translation of STEVEBFL's excellent Tutelage contained here: http://www.peachparts.com/Wikka/TransVacTune And here: http://www.peachparts.com/shopforum/tech-help/19841-transmission-shifting-response-vacuum-span-stevebfl-you-out-there.html#post100041 Of course there's also SMR's : It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ... DIY link: Transmission:
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'84 300SD sold 124.128
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Linear Mode
