Vacuum Line from Intake Manifold to Modulator controls 5th gear??
04-06-2018, 04:56 PM
#1
Junior Member
Thread Starter
Vacuum Line from Intake Manifold to Modulator controls 5th gear??
Hi there, i am new to this forum and this is my first post. I've been looking for answers over the internet about this and couldn't find a clear one.
I have 722.5 transmission, and my car is a w210 e320 1997. I have problem with 5th gear (All the gears other than the 5th shift well). The 5th gear slips, and sometimes it doesn't want to engage at all. It will engage in one condition..... if i disconnect the vacuum line from the Intake Manifold to Modulator Transmission. But the shift will get rough (though i will have my 5th gear back), and that is not what i want.
Now, i am pretty sure that there is no air leak in the vacuum line. And the modulator is also in good condition (It doesn't leak oil and still adjustable). So what could be the problem here, guys? Air leak in the intake manifold perhaps? Engine? Resonance Flap not working? Different pressure from the intake manifold to help the transmission to shift to 5th gear? Or maybe the valve body?
Note : The bowden cable is already adjusted well.... there is only 0,5 mm play in it. And i have no problem with the shift point. I have no problem with the shifter as well. It works well.
Please, anyone? Help?
I have 722.5 transmission, and my car is a w210 e320 1997. I have problem with 5th gear (All the gears other than the 5th shift well). The 5th gear slips, and sometimes it doesn't want to engage at all. It will engage in one condition..... if i disconnect the vacuum line from the Intake Manifold to Modulator Transmission. But the shift will get rough (though i will have my 5th gear back), and that is not what i want.
Now, i am pretty sure that there is no air leak in the vacuum line. And the modulator is also in good condition (It doesn't leak oil and still adjustable). So what could be the problem here, guys? Air leak in the intake manifold perhaps? Engine? Resonance Flap not working? Different pressure from the intake manifold to help the transmission to shift to 5th gear? Or maybe the valve body?
Note : The bowden cable is already adjusted well.... there is only 0,5 mm play in it. And i have no problem with the shift point. I have no problem with the shifter as well. It works well.
Please, anyone? Help?
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denichristantra (04-06-2018)
04-06-2018, 09:44 PM
#3
Junior Member
Thread Starter
WDB2100556A268514 is written near the door, and below the driver's seat is MHL2100550L030514. One of them must be the Vin number, i don't know which one. In here we call it differently..... please be patient with me.....
Last edited by denichristantra; 04-07-2018 at 03:22 AM.
04-07-2018, 08:16 PM
#4
Out Of Control!!
You have a 104.995 with a 722.509 transmission serial number 341309. That info will be needed to review the attached measuring and adjustment document.
Last edited by Plutoe; 04-08-2018 at 08:10 PM.
04-08-2018, 06:53 AM
#5
Junior Member
Thread Starter
Thanks Plutoe. Actually i did the exact procedure before, and the problem remains.
Last night, i removed the valve body, and found pieces of broken black plastic ABOVE the intermediate plate (where auxiliary valve is installed), and they were big..... like 3 x 2 cm each. There were 2 of them, and the rest were small pieces. They looked like they were parts of something before. Is it possible that Mercedes use plastic inside the gearbox?
After that i moved to inspect the valve body, and the number written on it : 129 270 07 07. I googled it and found that mostly 4 speed transmission like 722.3 or 722.4 use that valve body, and i couldn't find any documentation over the internet that any 722.5 ever use such part number for the valve body. How to be sure that this part number is used in a 722.509 transmission? Because it is possible that someone before me already replace the original valve body with the wrong one......
Well, so i disassemble the valve body, inspect the check *****, springs, and small elements within for damages (But without removing the accumulators, shift valve, regulator valves and so on, because i don't have the o rings with me). Everything inside the passages seems okay, so i clean them with MAF cleaner, carefully putting all the elements back, reinstall the valve body, went for a drive, and found that the problem remains. So again i have the vacuum to the modulator disconnected, went for a drive (Thinking that i will have my 5th gear back when i disconnect the vacuum line, like usual), and guess what? It didn't want to shift to 5th gear at all......not even a slip. So now i lost my 5th gear completely........
Sounds like a Valve Body issue to you? If it's truly the Valve Body, how to be sure which part number i should buy for my 722.509? Since i have a slight doubt that the Valve Body i have now is the correct one for my transmission.
Last night, i removed the valve body, and found pieces of broken black plastic ABOVE the intermediate plate (where auxiliary valve is installed), and they were big..... like 3 x 2 cm each. There were 2 of them, and the rest were small pieces. They looked like they were parts of something before. Is it possible that Mercedes use plastic inside the gearbox?
After that i moved to inspect the valve body, and the number written on it : 129 270 07 07. I googled it and found that mostly 4 speed transmission like 722.3 or 722.4 use that valve body, and i couldn't find any documentation over the internet that any 722.5 ever use such part number for the valve body. How to be sure that this part number is used in a 722.509 transmission? Because it is possible that someone before me already replace the original valve body with the wrong one......
Well, so i disassemble the valve body, inspect the check *****, springs, and small elements within for damages (But without removing the accumulators, shift valve, regulator valves and so on, because i don't have the o rings with me). Everything inside the passages seems okay, so i clean them with MAF cleaner, carefully putting all the elements back, reinstall the valve body, went for a drive, and found that the problem remains. So again i have the vacuum to the modulator disconnected, went for a drive (Thinking that i will have my 5th gear back when i disconnect the vacuum line, like usual), and guess what? It didn't want to shift to 5th gear at all......not even a slip. So now i lost my 5th gear completely........
Sounds like a Valve Body issue to you? If it's truly the Valve Body, how to be sure which part number i should buy for my 722.509? Since i have a slight doubt that the Valve Body i have now is the correct one for my transmission.
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denichristantra (04-08-2018)
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04-09-2018, 05:56 PM
#8
Junior Member
Thread Starter
Plutoe, sorry for bothering you too much, but maybe you can give me links where i can free-download a repair manual for my car? Maybe later i can pass my knowledge to others in this forum as well.... just like you.... 
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denichristantra (04-09-2018)
04-18-2018, 09:14 AM
#11
Junior Member
Thread Starter
Plutoe, after browsing a bit deeper about my problem (That someone before me already replaced the valve body with the wrong one) i found something interesting. If i am not mistaken, the valve body part number : 129 270 07 07 that i have now is for 722.3 transmission (4 speed), and the correct valve body part number for my transmission is : 124 270 80 15. But i think it won't affect my 5th gear? Since 5th gear is controlled electrically and not controlled by the valve body. Is this correct?
I noticed there are no electrical cables going in or out the valve body. Instead, the electrical cables going into auxiliary valve body (To the solenoid). Maybe it's the solenoid in the auxiliary valve body?
I noticed there are no electrical cables going in or out the valve body. Instead, the electrical cables going into auxiliary valve body (To the solenoid). Maybe it's the solenoid in the auxiliary valve body?
