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Long Term Tozo Valve Body Modification Update

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Long Term Tozo Valve Body Modification Update

 
Old 04-23-2007, 05:46 AM
  #21  
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Default Re: Your workaround resistor might be enough to keep it from hunting, but it's bad for science

Will any additional resistor value just be "learned" by the TCM? If we inspect the measuring blocks, Both "actual" and "learned value" are presented.

Regards

CalG
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Old 03-19-2008, 05:03 PM
  #22  
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Default Re: Long Term Tozo Valve Body Modification Update

I figure I would throw my data into the mix. I have the same problem, with the hunting and transmission drop-out. At least I think............

I marked my VAG log every time I felt the hunting, this is what I found

It always happened in 4th gear (when it should have down shifted into 3rd)
The most frequent speed was 34.72 mph or 56 Km/h and this was the worst chattering

I would like to add my comments about "hunting";
* the car feels like it's in the wrong gear typically between 3rd and 4th
* the car will jolt and chatter like a manual clutch and then switch gears (you can of course make it change gears by pounding on the gas or hitting the break)
* for me this happens on my way home from work, and not on the way to work
* it varies with the weather and temp

I cant wait till someone finds a fix!!!!!!!!!!!!!!!

Notes:
I replaced the TPS with a stock one about a month ago, once the car learned it the hunting came back. I also changed the ATF fluid 10K ago. The car has only 77K and is a 97 A8Q


Marked transmission log

Group A: '001 Group B:
RPM RPM RPM Load RPM
TIME TIME
STAMP /min /min /min STAMP % /min gear Marker
317.37 1216 1184 1184 4 317.66 0 1184 4 1
328.21 1184 1184 1184 4 328.49 27.1 1184 4 2
329.35 1248 1248 1248 4 329.64 26.7 1248 4 3
370.9 1344 1344 1344 4 371.19 12.5 1344 4 4
402.68 1120 1120 1120 4 402.96 14.1 1120 4 5
403.83 1152 1152 1152 4 404.11 23.5 1152 4 6
404.4 1184 1152 1152 4 404.68 23.5 1152 4 7
404.96 1184 1184 1184 4 405.25 23.5 1184 4 8
406.11 1216 1216 1216 4 406.39 23.1 1216 4 9
415.2 1184 1184 1152 4 415.49 9.8 1184 4 10
441.36 1280 1280 1248 4 441.65 32.2 1280 4 11
441.94 1344 1344 1312 4 442.22 32.2 1344 4 12
480.07 1184 1184 1184 4 480.35 34.5 1216 4 13

Marked Throttle Position Sensor Log

Marker TIME PID A - 012 TIME PID B - 013 TIME PID C - 017 TIME
STAMP Engine RPM ( /min) STAMP Vehicle speed ( km/h) STAMP Throttle position sensor ( %) STAMP mph
60.24 1312 60.58 63 59.54 12.9 39.06
61.62 1184 61.97 64 60.91 16.9 39.68
1 63 1216 63.35 65 62.3 16.9 40.3
2 107.16 1312 107.5 60 106.44 20.8 37.2
3 112.7 1600 113.05 72 111.99 39.6 44.64
4 228.49 1152 228.83 52 227.78 12.9 32.24
5 229.89 1216 230.23 56 229.16 12.9 34.72
7 240.93 1216 241.27 56 240.24 16.9 34.72
9 242.29 1248 242.64 57 241.6 17.6 35.34
11 253.36 992 253.7 46 252.66 28.2 28.52
12 256.13 1888 256.47 56 255.42 42 34.72
14 271.34 1152 271.7 52 270.63 29.4 32.24
16 272.72 1216 273.06 56 272.03 32.5 34.72
17 290.66 1376 290.99 64 289.95 36.5 39.68
18 292.02 1504 292.36 69 291.32 36.5 42.78
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Old 03-08-2011, 05:52 PM
  #23  
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Default Problem solved

I ended up droping my tranny out and got my tourque converter and valvebody rebuilt, it didn't solve the issue. I had a local shop do my torque converter and Itp did my valve body. Around 20-40k after the rebuild, the vb blewby and almost took out my clutch drum. I then took it to my local guy and found that There is a hard part within the valve body that wares out, and that this is the issue. If you get hunting, get your vb replaced or bored out. See below

http://www.freddiestransmissions.com..._morrison.html
http://www.freddiestransmissions.com/CIMG4362.JPG
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Old 07-12-2016, 08:47 AM
  #24  
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I am recently getting pretty much a lot of gear hunting,
I Changed the fluid and filter 2000 miles ago.Used pentosin,oem filter and oem gasket.
Before with the old fluid it hunted 80% less.
125k miles on the clock.
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Old 07-12-2016, 01:41 PM
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Thats interesting ^ this all sounds very similar to what mine is doing now. Is there a thread anywhere on what this mod is, or is it top secret?
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Old 07-12-2016, 06:38 PM
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How many miles on the clock?
When did you change the fluid?^
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Old 07-13-2016, 01:54 AM
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111K and just now. As per my shudder thread, I think it started behaving badly when the fluid was low due to a leak. I pulled it apart and did the problem bearing and o-ring and re-sealed the sump properly, but its not worked properly since.

The symptoms in this thread are very similar to what its doing, but I'm also beginning to wonder if the low fluid screwed up the TC.
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Old 07-13-2016, 09:56 AM
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i wonder when you buy transaxle from a dealer its 4300$(part only) what new parts do you get inside vs. tozo rebuild( around 3000$ parts and labor).
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