Beautiful. So I was getting flares between gear changes and dialed the pressure up on the adjustment with the volume cap off. Flares are reduced, almost imperceptible unless in a very specific rpm range (2200 - 2500). However, there's a big shudder and jolt when the car warms up, and I go from P to D, or D to R or R to D at idle. In normal driving, gear shifts are smooth. Jolt only happens at stand still. What could be the likely culprit?
Actually thought I would test my trans yesterday, used standard oil pressure kit, had all the fittings including elbow in my kit. But had zero pressure at idle, with vacuum connected. Thinking port may be blocked ? I didn't let it run for too long, before questioning whether I even had it connected to the right port, after seeing your video again I can confirm its the same port.
Hello please can I have a link to have the sheet with the specifications according to the transmissions. I have to change the modulator on a Mercedes w124 E250 diesel from 1994 engine OM 605 911, thank you in advance
Great educational video as always and thank you. Quick question, Can a bad modulator cause smoke from exhaust pipe? I am also an owner of 300CE with M104
when diaphragm ruptures in these things on any transmission it is possible to suck atf up and into the intake manifold. My first car as a kid was doing these smoke screens, it is accompanied by poor or no shifting once the fluid level gets low enough. easy enough to test with hand vacuum pump
entirely possible, but i cant legally drive it to bring it up to temp yet. I’m not gonna play with this one im more interested in why blueblack has very firm shifts
Question, does the modulated oil pressure control the hydraulic pressure on the bands and clutches? I.e, if the modulation pressure is increased, Tee bar screwed in, is the transmission less likely to slip under full power situation? Many thanks. I see many people are running incredible power and high boost, but what Mods are the doing to there trans
@@MMWA-DAVE ah okay, makes sense if it comes with the star kit. I could only find the first 3 pages online (without the tables) Thanks for your response I will have to calculate it instead using pictures. Information on these old mercs is getting harder to find. Thanks 👍
I have a W126 300SE 1988 with the 4 speed trans. # on box is 126 270 95 01 722 319 0 30 007 32 on the side, does anyone have the pressures of this trans. please, it hard when I into reverse and I'm sure the pressures are too high. I just can't find anything information on this particular box, can anyone help please. I also would like a proper manual on the car and the auto-trans thanks
@@MMWA-DAVE well my issue is that the cable is fully extended and i still have high rpm shifts if I shorten the cable a bit it increases the rpm to shift even more...The shifts at low speed are with a clunk sometimes and a push foreward...at full throttle the shifts are smooth fast and nice overall but still at high rpms..All vaccums check i dont know what to do honestly anymore..
@@salehfiras943 do you have the S/W switch by any chance? If this is malfunctioning it may explain the late shifting. The harsh shifting at low speed does sound like the vacuum modulator either not adjusted right or having a burst diaphragm. It can be tested with a vacuum tester. The S/W function is also a vacuum pod on the throttle pressure cable which can also be tested same way.
@@MMWA-DAVE I have fixed the problem(6months worth of reading manuals and forums and all of that... maybe it will help others in the future...The pin in the garbox that it connected to the cable was stuck! Couldnt believe it but it did! For anyone who has problems with the gearbox take it step by step...Verify linkage corection of the pressure cable (and the integrity of the cable by hearing a click in the gearbox when pulling and letting go),verify vaccums and after that dig deeper(ofcourse after you SERVICE the gearbox with a new filter and the right new oil)
Nicely done test of system pressure.thank you .
Beautiful. So I was getting flares between gear changes and dialed the pressure up on the adjustment with the volume cap off. Flares are reduced, almost imperceptible unless in a very specific rpm range (2200 - 2500). However, there's a big shudder and jolt when the car warms up, and I go from P to D, or D to R or R to D at idle. In normal driving, gear shifts are smooth. Jolt only happens at stand still. What could be the likely culprit?
Make a video about adjusting that. My 124 shifts a little rough
yes pls! we need this
Actually thought I would test my trans yesterday, used standard oil pressure kit, had all the fittings including elbow in my kit. But had zero pressure at idle, with vacuum connected. Thinking port may be blocked ? I didn't let it run for too long, before questioning whether I even had it connected to the right port, after seeing your video again I can confirm its the same port.
Buenas ajustando el modulador de vacio para cambiie mas rapido seria aflojar o apretar??
Hello please can I have a link to have the sheet with the specifications according to the transmissions. I have to change the modulator on a Mercedes w124 E250 diesel from 1994 engine OM 605 911, thank you in advance
I have an R129 1991 Mercedes and want to adjust my new modulator. Where can i find the manual? Do you sell it?
Great educational video as always and thank you. Quick question, Can a bad modulator cause smoke from exhaust pipe? I am also an owner of 300CE with M104
when diaphragm ruptures in these things on any transmission it is possible to suck atf up and into the intake manifold. My first car as a kid was doing these smoke screens, it is accompanied by poor or no shifting once the fluid level gets low enough. easy enough to test with hand vacuum pump
Great Thanks
Nice, Would there be any difference with the trans at operating temp?
entirely possible, but i cant legally
drive it to bring it up to temp yet. I’m not
gonna play with this one im more interested in why blueblack has very firm shifts
Not sure if you've rebuilt the trans yet or not, but that one sure looks healthy to me!
Yep, this ones already been rebuild, plus i threw in a complete reseal before fitting.
Do you have also explain how to check transmission of W126 722.300 ?
its the same deal, you just need to find the pressure for that transmission number
Question, does the modulated oil pressure control the hydraulic pressure on the bands and clutches? I.e, if the modulation pressure is increased, Tee bar screwed in, is the transmission less likely to slip under full power situation? Many thanks. I see many people are running incredible power and high boost, but what Mods are the doing to there trans
Hi, I have a 230 TE 1991 Wagon when I drive it would not shift to D could replacing the Vacuum Box fix my problem? Thanks
likley the transmission has had a serious internal malfunction if the oil level is correct and there are no forward gears.
Hey, where did you get the paperwork? Trying to see what the stock tourqe converter size for 722.311 is.
@@MechatronCNC-HVM its in the workshop information system, a standalone system with the epc or comes with star diagnostic setup
@@MMWA-DAVE ah okay, makes sense if it comes with the star kit.
I could only find the first 3 pages online (without the tables)
Thanks for your response
I will have to calculate it instead using pictures. Information on these old mercs is getting harder to find.
Thanks 👍
Can this cause transmission fluid leaking into the engines vacuum and going into combustion causing smoke?
absolutely. If there is any atf in the vacuum line, replace it.
@@MMWA-DAVE Do you know a website that sells a modulator (red) for a 93 190e 2.6, im having a hard time finding it.
@@Jhelmthe Mercedes Main Dealer garage can order their correct one for you, with the vehicle chassis number
I have a W126 300SE 1988 with the 4 speed trans. # on box is 126 270 95 01 722 319 0 30 007 32 on the side, does anyone have the pressures of this trans. please, it hard when I into reverse
and I'm sure the pressures are too high. I just can't find anything information on this particular box, can anyone help please. I also would like a proper manual on the car and the auto-trans
thanks
Blue black should have a om606 turbo swap
Could a bad vaccum modulator cause a late shift?
on these transmissions shift points are altered by the throttle pressure cable, which is adjustable. The vacuum modulator only alters shift firmness.
@@MMWA-DAVE well my issue is that the cable is fully extended and i still have high rpm shifts if I shorten the cable a bit it increases the rpm to shift even more...The shifts at low speed are with a clunk sometimes and a push foreward...at full throttle the shifts are smooth fast and nice overall but still at high rpms..All vaccums check i dont know what to do honestly anymore..
@@salehfiras943 do you have the S/W switch by any chance? If this is malfunctioning it may explain the late shifting. The harsh shifting at low speed does sound like the vacuum modulator either not adjusted right or having a burst diaphragm. It can be tested with a vacuum tester. The S/W function is also a vacuum pod on the throttle pressure cable which can also be tested same way.
@@MMWA-DAVE I have fixed the problem(6months worth of reading manuals and forums and all of that... maybe it will help others in the future...The pin in the garbox that it connected to the cable was stuck! Couldnt believe it but it did! For anyone who has problems with the gearbox take it step by step...Verify linkage corection of the pressure cable (and the integrity of the cable by hearing a click in the gearbox when pulling and letting go),verify vaccums and after that dig deeper(ofcourse after you SERVICE the gearbox with a new filter and the right new oil)
@@salehfiras943 What symptoms did you have with the jammed pin?