Recently I experienced some transmission problems. Here's what I have. The car shifts beautifully up until the switch from third to fourth gear. The car flares and then catches the change. I took the car in to a mercedes mechanic to run diagnostics and there were no codes to show a problem. I had the transmission maintenance done, the kick down switch replaced, the brake lite switch replaced (brake lights were doing their own thing), the ASR/ABS redone, software upgraded and still the problem exists. The transmission itself seems to be in good condition according to three different mechanics and dealerships. One of the cleanest that they have seen and they are baffled as to why this problem is here. I have already spent close to 1000.00 dollars so far on guesses. Could it be the TCU or the gear selector switch or even the valve body itself that is causing the problem. If so, why isn't it reading on the diagnostics? The other day it wouldn't shift out of first but after I shut the car off and restarted, it began to shift normally until the transition from 3rd to 4th. Any suggestions?
I am by no means an expert on these cars but, I would check the TCU before doing anything else. Although I have yet to experience this: Fluid can enter the electrical cable and fill the TCU. I'll be checking mine next oil change; if not sooner.
Hi. Dub - I was told that if the wheel/tire diameter and circumeference exceed the original factory by 3%, it may cause transmssion slipping, braking issues and other upleasant stuff.
Dub, in your case you probably went with 35 series tires, the max size allowed is 225/30/20 all around. original Section Width: 8.46 in
225/35R20 Section Width: 8.85 in
225/30R20 Section Width: 8.85 in
original Width Range: 6 - 7.5 in
225/35R20 Rim Width Range: 7.5 - 9 in
225/30R20 Rim Width Range: 8 - 9 in
original Diameter: 25.31 in
225/35R20 Overall Diameter: 26.20 in
225/30R20 Overall Diameter: 25.31 in
original Radius: 12.65 in
225/35R20 Radius: 13.10 in
225/30R20 Radius: 12.65 in
original Circumference: 79.51 in
225/35R20 Circumference: 82.30 in
225/30R20 Circumference: 79.51 in
original Revs per Mile: 821.8
225/35R20 Revs per Mile: 793.8
225/30R20 Revs per Mile: 821.8
original speedo:
225/35R20 Difference: 3.527% too slow
225/30R20 Speedometer Difference: 0%
225/35R20 Diameter Difference: 3.4%
225/30R20 Diameter 0%
I might be completly off on this, but I was warned about future issues if I went with 35's - I had a friend w/another W210 that had similar problems, so he swithed out his tire size to what was allowed - and no more tranny problems. Again I might be wrong so double check with your dealer.
Good luck!
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RE: Transmission slipping
Quote:
guess - 9/28/2005 11:57 AM
Hi. Dub - I was told that if the wheel/tire diameter and circumeference exceed the original factory by 3%, it may cause transmssion slipping, braking issues and other upleasant stuff.
Never heard of any of that being an issue but it will make your speedometer read wrong by that %.
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Hi. Dub - I was told that if the wheel/tire diameter and circumeference exceed the original factory by 3%, it may cause transmssion slipping, braking issues and other upleasant stuff.
Bigger diameter tires make your final overall gearing taller, therefore impairing braking and acceleration. I can't imagine how the extra load could possibly cause transmission clutches to slip any more than, say, driving up a hill.
The taller gearing could cause more torque converter slippage when taking off from a stop, but that's what the torque converter is designed to do.
was wondering if thi actaully true about having bigger rims on your car will cause tranny issues, because i jut put on 18'' wheel on my car and now my tranny is acting up.
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