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#1
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124 shifting too early, too hard
after reading many threads about people with late shift or shift flaring problems I have become somewhat confused as to which adjustments do what and how to make said adjustments. My '88 300 E shifts fairly hard but more importantly it shifts far to early, ill be in 4th gear by 20mph under moderate load. The hard shifting I can live with unless over time it will hurt the car (which I doubt) however it's a PITA to drive with it shifting this early and it won't even kick down above 50 or 60 mph. Is this just a bowden cable adjustment or do I need to also adjust the modulator on the transmission? also I am not familiar with how to make either of these adjustments so any help on that as well would be much apreciated
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E30 B25 126.036 123.130 with 616-Frankenbenz (sold) 124.030-Greyhound (sold) 124.030-Schnauzer (sold) DERP DERP |
#3
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Adjusting the modulator valve should help control your shift point.
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William ________________________________________ 1987 420 SEL - Like a fine wine only better with age |
#4
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Disclaimer - I am not an expert!
I am no expert, but I have been doing quite a bit of this for a couple of months now. My understanding is that in general the Bowden cable controls the shift point and the modulator adjusts the firmness of the shifts. The timing of the shifts, however, can also affect firmness a bit. That is why I originally started playing with the Bowden cable to see if I could get rid of a shift flair. In my case, I had to go after the modulator.
Anyway, the Bowden cable is easy to get to and easy to adjust with just your fingers. The cable is located right next to the throttle linkage right under the hood. You can simply turn a plastic nut that will tighten or loosen the cable to achieve earlier or later shifts. Just turn the nut and drive a little to see what happens. I started by making the cable tighter, until my car would almost not shift into 4th gear. It was like a race car, even with light throttle. The tighter cable simply tricks the car into thinking you are stomping on the gas pedal. What was my car thinking? Then I loosened the cable until I had it the way I thought it felt best. The modulator is a pain to get to in the driveway, but I turned mine one full turn to firm up the shifts and get rid of a flair. It worked, but I am thinking about backing off a half turn to soften the shifts a little. I am just afraid that the firmness of the shift may hurt the transmission. I think a shift flair must also be bad for the transmission, so it is a bit of a balancing act. It is just a pain to get under the car in the driveway to get to the modulator and then take a ride and maybe have to go back under the car again.
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I just couldn't give up on my 1995 E320. I think it might be like always going back to that same bad relationship with an ex girlfriend. You feel you love them too much, or you are just too stupid to know any better. Flickr slideshow of my 1995 E320 http://www.flickr.com/photos/24145497@N06/sets/72157616572140057/ |
#5
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Quote:
Also, I adjusted my modulator 1/2 turn. It firmed the shift up so much I had to back it off to only 1/4 turn.
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2012 E350 2006 Callaway SC560 |
#6
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I adjusted the Bowden cable quite a bit and this seems to have helped a great deal, It feels like it could still use a little more adjustment but I don't the white nylon screw will turn any more... It's definitely to the point where I can live with it though. Thanks for your help guys
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E30 B25 126.036 123.130 with 616-Frankenbenz (sold) 124.030-Greyhound (sold) 124.030-Schnauzer (sold) DERP DERP |
#7
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Just picked up a pretty nice, indie euro-shop maintained 93 400E, for a good price. I test drove it the other day and it shifted fine, tonight when I pick it up, of course, it will not upshift until 4500 rpm OR unless I let off the accelerator completely. Incidentally, the ASR light is on and it wasn't when I test drove it. Throttle body was just replaced to fix that problem. Where should I look first? Car has 161k and a full service history.
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former: 83 300D, 97 C230, 93 400E current: 08 C300 Luxury , 92 500SL |
#8
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Bumping this thread
I am looking to try and find the modulator... I managed to find the above picture^ Is that the adjustment screw shown? And where is this modulator? I had a mechanic recommend to adjust it for me, but it shifts way too hard now to the point that it bangs when dropping gears and hangs at the top end before shifting. I don't know what he did....so I am looking to adjust it back to the way it was (I thought it was fine before). I just need to find the unit.
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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 |
#9
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Sun Valley has a nice write up - http://www.mercedesdismantlers.com/722.3and722.416_transmission_adjustments.html It's on the driver's side of the transmission.
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#10
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go under the car and look up at the drivers side of the tranny. You will see where the diptstick goes down - just above here should be a white cap. Prise it off with a flat screwdriver and adjust the T piece inside. Put the cap back on and go for a drive.
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Mercedes E300D Multivalve W124 Estate (1994) - FULLY LOADED - MB-Tex, Electric Seats, Wood/Leather wheel, Alloys, Orthopedic Seat, Auto-Dim Mirror, Auto Climate Control, Fire Ext, Cruise Control Mercedes 280SL R107 (1985) - Signal Red, Pebble Leather, Cruise Control, Rear Seats, Headlamp Wash/Wipe, Rear Spoiler, Alloys, Hard & Soft Tops http://i451.photobucket.com/albums/q...latest_sig.jpg |
#11
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Quote:
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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 |
#12
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transmission shift points
reset the computer...works for me
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#13
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Old post but...
Shifting too early means the transmission bowden cable is too loose. Shifting hard is too much (or less, not sure on valve) vacuum at modulator on left (driver side) of tranny (some are green, black, or white I think). CCW the adjustment (T handle under plastic cap) for softer shifts. Usually if it's too tight or shifting at high RPMs, adjusting to a looser setting would solve the hard shifts. But unfortunately yours is the opposite, so modulator adjustment also. By the way if you ever need a tranny rebuilt send to Marc at: Sun Valley Mercedes Transmissions, LLC Rebuilt Mercedes Benz Automatic Transmissions 15468 Cabrito Road Van Nuys, California 91406 Phone: 818 782 2300 www.sunvalleymercedes.com
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91 MBZ 300TE 4M 91 Jag XJS V12 94 Alfa Romeo 164 LS 80 BMW 320i 85 BMW 528e 86 BMW 325e 88 BMW 325e 88 BMW 325i 89 BMW 325ix 95 BMW 525i 96 BMW M3 78 Fiat Spyder 124 98 Land Rover D1 LSE 98 Range Rover HSE 4.6 93 MBZ 190E 2.6 96 MBZ C280 93 MBZ 400E 90 MBZ 300ce 71 MGB-GT 91 VW Corrado G60 97 328i 99 E320 Wagon 97 E320 https://lh3.googleusercontent.com/-t...r+sig+copy.jpg Last edited by EuroRash; 10-15-2013 at 05:42 PM. |
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