Problems after replacing the transmission valve body

Amikam V10

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81 Posts

Discussion starter · #1 · Feb 21, 2023

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I have a 2006 Touareg V6 TDI. The car had a horrible jerky shift from the 5th gear to the 6th on hard accelerations especially while being warm (and occasionally in the other gears). Twice a complete transmission purge did not help it.

Therefore, the cause could have narrowed down to the faulty transmission valves. The reason should be that the heat changes the resistance of worn-out magnetic valves, driving them to malfunction and eventually causing the jerky shift.

I then bought a refurbished valve body and replaced it with mine. I have attached some images below for the sake of comparison.

The part number of both parts are the same (Aisin 8860) but they have slight differences, namely the N88 and N89 Solenoids on the replacement one had different wiring plug sizes. Hence, I tested my original N88 and N89 Solenoids (12.5 Ohms each) and used them in the newer valve body. Additionally, the new/refurbished one has two extra safety pressure valves.

Now after replacing it and filling the transmission with quality oil and replacing the filter (I know the process and did it multiple times on another Touareg), by putting the car in gear it moves abruptly forward. Pressing the brake equals shutting the engine as the torque converter can not be disengaged in idle mode.

I know this phenomenon can also be the result of low transmission fluid but not in my case. In addition, there is no fault code in the transmission control module.

Should you have experience with this theme, I appreciate your comments.

 

Amikam V10

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81 Posts

Discussion starter · #2 · Feb 21, 2023

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Here are some extra images

Below is also some documentation from Aisin:

 

Mexglx

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2004 TReg V8 4CAir, w/rear Diff lock.

Joined Jun 1, 2022

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314 Posts

#3 · Feb 22, 2023

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I just rebuilt my valve body with transgo kit. It said the K,B,Line pressure, and TCC solenoids should be between 5-7 ohms. Also they should not have any continuity between either terminal and the solenoid body. I had hard shifting when hot. After rebuild it's great. Maybe do the $100 kit on the old valve body and swap it back in.Valve body rebuild

 

SaVAGeSoot

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'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#4 · Feb 22, 2023

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Amikam V10 said:

Now after replacing it and filling the transmission with quality oil and replacing the filter (I know the process and did it multiple times on another Touareg), by putting the car in gear it moves abruptly forward. Pressing the brake equals shutting the engine as the torque converter can not be disengaged in idle mode.

Click to expand...

I'd suggest using VCDS to log\monitor the parameters of the respective solenoids.
I'd start by focusing on N91 based on your described scenario. Reference Fig.14 in that same document that you are showing. If VCDS doesn't have any usable MVBs to use, you may need to back-probe the connector to put a meter on.

 

Amikam V10

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81 Posts

Discussion starter · #5 · Feb 23, 2023

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Thank you guys for your suggestions. I see what comes next...

 

Amikam V10

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81 Posts

Discussion starter · #6 · Mar 7, 2023

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I have tried to reinstall my original valve body again but after all, I got the same huge vibration and abrupt start effect.

Before going into more details as a side note, based on the diagnosis tables in fig. 14, the N283 solenoid should have caused problems in my original setting since when warm, I had hard shifts from 6 to 5 and 2 to 1.

Based on our previous assumption, the N91 solenoid could have caused the hard start problem but now, since all original valves are back again, this should eliminate the possibility of faulty valves (only N88 and N89 were the same on both valve bodies).

Here I attach footage of the VCDS solenoid readings in different gears. Please note that vibration affected the filming process.

During the vibration, the amperage values of some solenoids (e.g. N93) are not as specified but they eventually land in their normal range.

Another observation was that in reverse, without pressing the gas pedal, the car moves way faster than it used to. In addition, once in a blue moon, the forward run does not vibrate.


I am starting to think that there could be some problems besides the solenoids and the valve body, mechanical/oil/...

 

SaVAGeSoot

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'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#7 · Mar 7, 2023

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Why aren't you using the log function so that you can review readings properly? You should also select the gear you're in, not just the selector position.

 

Mexglx

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2004 TReg V8 4CAir, w/rear Diff lock.

Joined Jun 1, 2022

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314 Posts

#8 · Mar 8, 2023

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I say try the Transgo kit. If all the solenoids test fine electrically as it says on page 2, step 1, you may still have problems with the armature sticking internally. That's what this kit addresses. I had hard shifting and flares. Many of the armatures inside the solenoids were slightly tight. The procedure to open up the solenoids, and clean them out (scrape inside bore manually by hand and clean with a drill bit) had a lot to do with the improvement as well as changing the valve body parts they supplied and drilling out the separator plate. I had ZERO faults in the computer before. Not one error yet it drove like **** after it warmed up. This fixed my problem. All my solenoids that get cleaned out tested within resistance specs and were not shorted to ground yet they were sticky inside. It was $100 for the kit. I borrowed a grinder from a friend to open up the solenoids. Read the instructions or give the kit and valve body to your tranny mechanic and have them do it. If you DIY, three cans of spray parts cleaner and A LOT of paper towels. A short, flat screwdriver is important to disconnect the wires from the valve body, they are harder to disconnect than it looked. Do follow the instructions religiously. double check each step before starting and completing. Making sure the wires are out of the way when dropping valve body and raising it back up are important. I used my floor jack to hold it in place. Carefully. I linked to a post/video in my previous post. Watch that video. Its a messy job but the results worked for me. I am preaching since the improvement was dramatic. If your solenoids test fine electrically, don't think everything is OK. They may still be sticky inside.

 

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Amikam V10

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81 Posts

Discussion starter · #9 · Mar 11, 2023

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First of all, many thanks for the detailed descriptions. I keep these recommendations for plan B as first I have to understand what exactly is wrong right now.

To summarize, I had hard transmission shifts from 5 to 6 and 2 to 1 only when the transmission was very hot (could have been an N283 solenoid problem). Otherwise, it was very smooth and silent. Therefore, I replaced the complete valve body with a fully refurbished one. After it, I experienced a harsh and hard shift and abrupt movement from the stop to the first gear or reverse, as described.

Then, I put back the old valve body again to check if anything in the newer valve body was faulty. To my surprise, the hard-shifting problem and abrupt movement persisted with the original valve body.

I have monitored and reported the solenoid operation in the last post but here is the tabular result of the solenoid monitoring:

TIME STAMP​

Transmission - Inp. Speed (G182) /min​

Transmission Fluid - Temperature (G93) °C​

Torque Converter – Slip /min​

Solenoid Valve 5 - (N92) Control Amp​

Solenoid Valve 9 - (N282) Control Amp​

Solenoid Valve 3 - (N90) Control Amp​

Solenoid Valve 10 - (N283) Control Amp​

Solenoid Valve 6 - (N93) Control Amp​

Solenoid Valve 4 - (N91) Control Amp​

Solen. Valve 1 (N88) - Solen. Valve 2 (N89)​

Selector Lever - Position​

Selected Gear​

1.24​

780​

42​

9​

0.1​

0.1​

0.99​

0.99​

0.98​

0.2​

0-0​

P​

0​

3.05​

780​

42​

4​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

4.83​

780​

42​

3​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

6.67​

780​

42​

23​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

8.49​

780​

42​

2​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

10.3​

780​

42​

-11​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

12.13​

780​

42​

1​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

13.99​

990​

42​

2​

0.1​

0.1​

0.99​

1​

0.95​

0.2​

0-0​

P​

0​

15.79​

1080​

42​

12​

0.1​

0.1​

0.99​

1​

0.9​

0.2​

0-0​

P​

0​

17.61​

780​

42​

0​

0.1​

0.1​

0.99​

0.99​

0.98​

0.2​

0-0​

P​

0​

19.43​

780​

42​

-1​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

21.26​

780​

43​

-1​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

23.13​

810​

43​

5​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

24.97​

780​

43​

12​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

26.75​

660​

43​

79​

0.99​

0.99​

0.78​

0.99​

0.88​

0.2​

1-0​

R​

0​

28.57​

840​

43​

4​

0.99​

0.99​

0.98​

0.99​

0.82​

0.19​

0-0​

N​

0​

30.42​

780​

43​

-2​

0.99​

1​

0.99​

0.99​

0.97​

0.2​

0-0​

N​

0​

32.24​

780​

43​

7​

1​

1​

0.99​

1​

0.98​

0.2​

0-0​

N​

0​

34.08​

780​

43​

2​

0.99​

0.99​

0.99​

0.99​

0.97​

0.2​

0-0​

N​

0​

35.91​

780​

43​

4​

0.99​

0.99​

0.99​

0.99​

0.97​

0.2​

0-0​

N​

0​

37.74​

810​

43​

0​

1​

1​

0.99​

1​

0.98​

0.2​

0-0​

N​

0​

39.58​

780​

43​

7​

1​

1​

0.99​

1​

0.97​

0.2​

0-0​

N​

0​

41.4​

780​

43​

7​

0.99​

0.99​

0.99​

1​

0.98​

0.2​

0-0​

N​

0​

43.24​

810​

43​

6​

1​

1​

0.99​

1​

0.98​

0.2​

0-0​

N​

0​

45.05​

810​

43​

-1​

0.99​

0.99​

0.99​

1​

0.97​

0.19​

0-0​

N​

0​

46.87​

780​

43​

3​

1​

1​

0.99​

1​

0.98​

0.2​

0-0​

R​

0​

48.7​

150​

43​

479​

0.99​

0.99​

0.76​

0.99​

0.88​

0.2​

1-0​

R​

0​

50.56​

90​

43​

967​

0.99​

0.99​

0.1​

0.99​

0.68​

0.2​

0-0​

R​

R​

52.36​

180​

43​

653​

1​

1​

0.1​

1​

0.72​

0.2​

0-0​

R​

R​

54.24​

240​

43​

542​

1​

1​

0.1​

1​

0.77​

0.2​

0-0​

R​

R​

56.04​

300​

43​

498​

1​

1​

0.1​

0.99​

0.75​

0.2​

0-0​

R​

R​

57.86​

960​

43​

8​

1​

1​

0.1​

1​

0.73​

0.2​

0-0​

D​

R​

59.69​

510​

43​

658​

0.78​

0.99​

0.99​

1​

0.75​

0.2​

0-0​

D​

R​

61.51​

480​

43​

247​

0.1​

0.99​

0.99​

0.34​

0.89​

0.2​

0-0​

D​

2H​

63.32​

750​

43​

53​

0.1​

1​

0.99​

0.1​

0.97​

0.2​

0-0​

D​

2H​

65.14​

810​

43​

6​

0.1​

0.99​

0.99​

0.1​

0.98​

0.2​

0-0​

D​

2H​

67.01​

780​

43​

14​

0.1​

1​

0.99​

0.1​

0.98​

0.2​

0-0​

D​

2H​

68.82​

660​

43​

146​

0.1​

1​

0.99​

0.1​

0.97​

0.2​

0-0​

D​

2H​

70.62​

570​

43​

234​

0.1​

1​

0.99​

0.1​

0.98​

0.2​

0-0​

D​

2H​

72.42​

390​

43​

497​

0.1​

0.99​

0.99​

0.1​

0.98​

0.2​

0-0​

D​

2H​

74.26​

390​

43​

2​

0.1​

1​

0.99​

0.1​

0.99​

0.2​

0-0​

N​

2H​

76.11​

690​

43​

52​

1​

1​

0.78​

1​

0.88​

0.2​

1-0​

R​

0​

77.93​

930​

43​

7​

1​

1​

0.1​

1​

0.86​

0.19​

0-0​

N​

0​

79.76​

690​

43​

11​

1​

1​

0.96​

1​

0.88​

0.2​

1-0​

R​

0​

81.58​

90​

43​

459​

0.99​

0.99​

0.68​

0.99​

0.88​

0.2​

0-0​

R​

R​

83.43​

870​

43​

11​

0.99​

0.99​

0.1​

0.99​

0.74​

0.19​

0-0​

D​

R​

85.26​

660​

43​

328​

0.76​

1​

1​

1​

0.75​

0.2​

0-0​

D​

R​

87.08​

510​

43​

254​

0.1​

1​

1​

1​

0.98​

0.2​

0-0​

D​

1H​

88.89​

570​

43​

182​

0.1​

0.99​

0.99​

0.99​

0.98​

0.2​

0-0​

D​

1H​

90.71​

240​

43​

711​

0.1​

1​

0.99​

1​

0.97​

0.19​

0-0​

D​

1H​

92.56​

780​

43​

33​

0.77​

1​

0.99​

1​

0.87​

0.19​

1-0​

R​

0​

94.35​

300​

43​

419​

0.99​

0.99​

0.75​

0.99​

0.88​

0.2​

1-0​

R​

0​

96.22​

540​

43​

225​

1​

1​

0.1​

1​

0.71​

0.19​

0-0​

R​

R​

98.05​

840​

43​

12​

0.99​

0.99​

0.98​

0.99​

0.94​

0.2​

0-0​

N​

0​

99.9​

690​

43​

441​

0.8​

0.99​

0.99​

0.99​

0.88​

0.2​

0-0​

D​

1H​

101.76​

930​

43​

-2​

0.09​

0.99​

0.99​

0.99​

0.98​

0.2​

0-0​

D​

1H​

103.6​

1050​

43​

-10​

0.1​

0.99​

0.99​

1​

0.97​

0.2​

0-0​

D​

1H​

105.42​

1230​

43​

3​

0.1​

1​

0.99​

0.99​

0.91​

0.19​

0-0​

D​

1H​

107.22​

960​

43​

9​

0.1​

0.99​

0.99​

0.75​

0.91​

0.2​

0-0​

D​

1H​

109.05​

810​

43​

2​

0.1​

1​

0.99​

0.1​

0.97​

0.2​

0-0​

D​

2H​

110.86​

810​

43​

-1​

0.1​

1​

0.99​

1​

0.96​

0.2​

0-0​

N​

0​

112.7​

780​

43​

11​

1​

0.99​

0.99​

0.99​

0.97​

0.19​

0-0​

N​

0​

114.54​

1320​

43​

-2​

1​

1​

0.99​

1​

0.98​

0.2​

0-0​

N​

0​

116.35​

750​

43​

-16​

1​

1​

0.99​

1​

0.95​

0.2​

0-0​

R​

0​

118.14​

780​

43​

15​

1​

1​

0.99​

1​

0.88​

0.2​

1-0​

R​

0​

119.96​

90​

44​

505​

1​

1​

0.72​

1​

0.88​

0.2​

1-0​

R​

R​

121.8​

840​

44​

2​

0.99​

0.99​

0.47​

0.99​

0.84​

0.19​

0-0​

P​

0​

123.63​

780​

44​

1​

1​

0.99​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

125.46​

780​

44​

7​

0.1​

0.09​

0.99​

0.99​

0.98​

0.2​

0-0​

P​

0​

127.3​

780​

44​

3​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

129.14​

780​

44​

7​

0.1​

0.09​

0.99​

0.99​

0.97​

0.19​

0-0​

P​

0​

130.95​

810​

44​

5​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

132.8​

780​

44​

4​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

134.62​

780​

44​

4​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

136.44​

780​

44​

2​

0.1​

0.1​

0.99​

1​

0.97​

0.19​

0-0​

P​

0​

138.29​

780​

44​

4​

0.1​

0.1​

0.99​

1​

0.97​

0.2​

0-0​

P​

0​

140.1​

780​

44​

-5​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

141.97​

780​

44​

5​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

143.8​

780​

45​

-1​

0.1​

0.1​

0.99​

0.99​

0.97​

0.19​

0-0​

P​

0​

145.65​

780​

45​

-3​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

P​

0​

147.47​

780​

45​

10​

0.1​

0.1​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

149.32​

780​

45​

4​

0.1​

0.1​

0.99​

0.99​

0.97​

0.2​

0-0​

R​

0​

151.15​

450​

45​

847​

1​

0.99​

0.78​

0.99​

0.88​

0.2​

1-0​

R​

0​

152.97​

0​

45​

767​

0.99​

0.99​

0.09​

0.99​

0.71​

0.2​

0-0​

R​

R​

154.8​

870​

45​

11​

1​

1​

0.12​

1​

0.86​

0.2​

0-0​

R​

0​

156.57​

630​

45​

364​

1​

1​

0.78​

1​

0.88​

0.2​

1-0​

R​

0​

158.4​

0​

45​

0​

0.99​

1​

0.1​

0.99​

0.75​

0.2​

0-0​

R​

R​

160.21​

0​

45​

0​

0.99​

0.99​

0.72​

0.99​

0.96​

0.2​

0-0​

N​

0​

178.39​

N​

45​

-2​

0.99​

0.99​

0.99​

0.99​

0.99​

0.2​

0-0​

N​

0​

182.09​

1050​

45​

3​

0.1​

0.99​

0.99​

1​

0.94​

0.2​

0-0​

D​

1H​

183.9​

1170​

45​

22​

0.1​

0.99​

0.99​

1​

0.97​

0.2​

0-0​

D​

1H​

185.74​

840​

45​

4​

0.1​

0.99​

0.99​

0.99​

0.97​

0.2​

0-0​

D​

1H​

187.57​

780​

45​

2​

0.1​

1​

0.99​

1​

0.98​

0.19​

0-0​

D​

1H​

189.37​

780​

45​

2​

0.1​

0.99​

0.99​

0.99​

0.97​

0.19​

0-0​

D​

1H​

191.14​

630​

45​

285​

0.1​

0.99​

0.99​

0.99​

0.97​

0.2​

0-0​

D​

1H​

192.96​

810​

45​

15​

0.1​

0.99​

0.99​

1​

0.88​

0.19​

0-0​

N​

0​

194.78​

720​

45​

32​

1​

1​

0.78​

1​

0.88​

0.2​

1-0​

R​

0​

196.61​

810​

45​

15​

1​

1​

0.1​

1​

0.91​

0.19​

0-0​

N​

0​

198.42​

780​

45​

0​

0.99​

1​

0.99​

1​

0.97​

0.2​

0-0​

N​

0​

200.24​

720​

45​

16​

0.99​

0.99​

0.99​

1​

0.88​

0.2​

1-0​

R​

0​

202.07​

960​

45​

24​

0.99​

0.99​

0.66​

0.99​

0.88​

0.2​

0-0​

N​

R​

203.87​

690​

45​

144​

0.8​

1​

0.99​

1​

0.88​

0.19​

0-0​

S​

1H​

205.7​

930​

46​

-61​

0.1​

0.99​

0.99​

1.01​

0.95​

0.2​

0-0​

S​

1H​

207.5​

1260​

46​

1​

0.1​

1​

0.99​

0.99​

0.97​

0.2​

0-0​

S​

1H​

209.35​

1110​

46​

5​

0.1​

1​

0.99​

1​

0.96​

0.19​

0-0​

S​

1H​

211.18​

1260​

46​

4​

0.1​

1​

0.99​

0.99​

0.97​

0.2​

0-0​

S​

1H​

213.01​

990​

46​

-1​

0.1​

1​

0.99​

0.99​

0.97​

0.2​

0-0​

S​

1H​

214.85​

750​

46​

13​

0.1​

1​

0.99​

1​

0.97​

0.2​

0-0​

D​

1H​

216.72​

780​

46​

72​

0.1​

0.99​

0.99​

1​

0.98​

0.2​

0-0​

D​

1H​

218.58​

180​

46​

622​

0.1​

1​

0.99​

1​

0.98​

0.19​

0-0​

D​

1H​

220.41​

0​

46​

809​

0.1​

0.99​

0.99​

0.99​

0.99​

0.2​

0-0​

D​

1H​

222.25​

0​

46​

817​

0.1​

1​

0.99​

0.99​

0.99​

0.19​

0-0​

D​

1H​

224.03​

810​

46​

16​

0.8​

1​

0.99​

1​

0.93​

0.2​

0-0​

P​

0​

225.89​

780​

46​

5​

1​

0.99​

0.99​

1​

0.98​

0.2​

0-0​

P​

0​

To me, it looks now like the N88 and N93 are not operating in their defined amperage range. Any idea where else could be the source of the problem?

 

SaVAGeSoot

· Registered

'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#10 · Mar 11, 2023

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I'd suggest logging rpm and vehicle speed.
On my controller, I can log requested and actual current, so I'd even try that to see if the valves are doing what they are told to do.

Code:

Address 02: Auto Trans (0C8 927 750 CF)
12:12:25
  IDE00075-ENG99967 Vehicle speed-Vehicle Speed Sensor 0 km/h
  IDE00090 selected gear PN range
  IDE06658-ENG99605 Pressure control valve 2: act. current-Actual current SLB1 0.10 A
  IDE06659-ENG101258 Pressure control valve 3: act. current-Actual current SLC1 0.10 A
  IDE06660-ENG101181 Pressure control valve 3: spec. current-Order current SLC1 0.10 A
  IDE06661-ENG100294 Pressure control valve 2: spec. current-Order current SLB1 0.10 A
  IDE06662-ENG100356 Pressure control valve 4: spec. current-Order current SLC2 1.00 A
  IDE06663-ENG99880 Pressure control valve 4: act. current-Actual current SLC2 1.00 A
  IDE06664-ENG99347 Pressure control valve 5: act. current-Actual current SLC3 1.00 A
  IDE06665-ENG101266 Pressure control valve 5: spec. current-Order current SLC3 1.00 A
  IDE06668-ENG103285 Pressure control valve 1: act. current-Actual current SLT 1.00 A

 

SaVAGeSoot

· Registered

'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#11 · Mar 11, 2023

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Look closely at your N93.... what you're reporting and what the amps are showing coincide with the hard shifts.

Solenoid SV6 (N93) is modulated based on engine load to control main line pressure.
Amperage will decrease to increase main line pressure.

Click to expand...

I'd suggest testing the solenoid and also seeing if the value you are reporting is actual or requested, or both.

 

Amikam V10

· Registered

Joined Feb 5, 2019

·

81 Posts

Discussion starter · #12 · May 22, 2024

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I wanted to provide an update on the issue. I didn't find any faulty solenoids, so I replaced all of them to eliminate the possibility of bad solenoids. Now, the car shifts normally when it's cold, but when it warms up, the hard up- and down-shifting returns (the original problem).

I then replaced the transmission cooler thermostat, hoping it was the cause, but there was no change.

Next, I replaced the transmission position sensor, as documentation suggested it could cause hard shifting if it fails. Unfortunately, this didn't help either.

After that, I replaced the transmission temperature sensor, thinking the reading might be inaccurate, but this also didn't resolve the issue.

Finally, I tested a spare transmission control module to see if it was causing the shifting problems, but it wasn't the culprit.

I'm out of ideas. Does anyone have any suggestions?

 

Mexglx

· Registered

2004 TReg V8 4CAir, w/rear Diff lock.

Joined Jun 1, 2022

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314 Posts

#13 · May 22, 2024

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Wait. You tested the solenoids, they were good, AND you replaced them? WHY! For $100 you could have just done the Transgo kit and been done. Your symptoms are identical to mine. I fixed 95% of my issues with the kit. No more issues when hot, not more flares or hard shifts when warm. The only thing is occasionally the 1st to 2nd shift can be abrupt. Every other gear is butter. I can’t believe the you dropped the valve body and replaced the solenoids and didn’t do the kit. You were 75% of the way home.

 

Amikam V10

· Registered

Joined Feb 5, 2019

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81 Posts

Discussion starter · #14 · May 22, 2024

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Thank you for your response.

Initially, I believed the repair kit would refurbish the solenoids to their original factory specifications. However, from your explanation, it seems that the repair kit actually alters the flow dynamics of the solenoids. Is that correct?

I replaced all the solenoids because I found a good deal on new aftermarket ones and assumed this would eliminate any chance of solenoid combination issues.

I will proceed with the repair kit, but logically, it seems the underlying problem might lie also elsewhere since the standard solenoids solely haven't resolved the issue. Therefore, the modified solenoids should compensate for this.

 

SaVAGeSoot

· Registered

'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#15 · May 22, 2024

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Amikam V10 said:

I'm out of ideas. Does anyone have any suggestions?

Click to expand...

Sounds like you're replaced just about everything.
Have you checked any of the wiring or resistance readings as per manual?

 

Mexglx

· Registered

2004 TReg V8 4CAir, w/rear Diff lock.

Joined Jun 1, 2022

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314 Posts

#16 · May 22, 2024

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Not exactly. Assuming you keep the original solenoids, the kit will have you disassemble them clean out the inside of the armature and the inside of the solenoid where the armature rides to create less resistance and faster, shifting reaction of the solenoids. Then you go into the valve body itself and replace a number of valves with either Improved design or lower resistance valves. Finally, you drill the separator plate in a number of areas to open up a number of ports that can become clogged and were undersized to begin with improving flow across the entire valve body. If you replace your solenoids, you no longer have to take apart the old solenoids and do anything to them. Since you have new solenoids, all you have to do is the remainder of the kit to replace valves in the valve body and the drill separator plate. A lot of what happens by replacing parts is also all the cleaning that you do to the valve body along the way, cleaning out debris, cleaning out little specs of material that could’ve been plugging up passages and restricting movement of check balls and little check valves, etc.

 

Amikam V10

· Registered

Joined Feb 5, 2019

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81 Posts

Discussion starter · #17 · May 22, 2024

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SaVAGeSoot said:

Sounds like you're replaced just about everything.
Have you checked any of the wiring or resistance readings as per manual?

Click to expand...

Yes, all solenoids and wires were in range.

 

Amikam V10

· Registered

Joined Feb 5, 2019

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81 Posts

Discussion starter · #18 · May 22, 2024

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Mexglx said:

Not exactly. Assuming you keep the original solenoids, the kit will have you disassemble them clean out the inside of the armature and the inside of the solenoid where the armature rides to create less resistance and faster, shifting reaction of the solenoids. Then you go into the valve body itself and replace a number of valves with either Improved design or lower resistance valves. Finally, you drill the separator plate in a number of areas to open up a number of ports that can become clogged and were undersized to begin with improving flow across the entire valve body. If you replace your solenoids, you no longer have to take apart the old solenoids and do anything to them. Since you have new solenoids, all you have to do is the remainder of the kit to replace valves in the valve body and the drill separator plate. A lot of what happens by replacing parts is also all the cleaning that you do to the valve body along the way, cleaning out debris, cleaning out little specs of material that could’ve been plugging up passages and restricting movement of check balls and little check valves, etc.

Click to expand...

Thanks for the explanation. I'm going to proceed with it. However, my initial move was to replace a fully refurbished valve body (as mentioned in my first post here). It's possible that it wasn't done properly.

 

SaVAGeSoot

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'14 TDI Execline

Joined Mar 23, 2022

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12,815 Posts

#19 · May 23, 2024

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Amikam V10 said:

Yes, all solenoids and wires were in range.

Click to expand...

So you took readings from the TCM connector?

 

Amikam V10

· Registered

Joined Feb 5, 2019

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81 Posts

Discussion starter · #20 · May 23, 2024

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SaVAGeSoot said:

So you took readings from the TCM connector?

Click to expand...

I have verified the connectivity of the TCM connectors to the transmission (while the system was cold and with the valve body removed). Additionally, as mentioned above, I replaced the TCM with an identical spare to rule out any potential issues with the TCM. The problem arises as soon as the engine oil temperature reaches 80°C. Below that temperature everything is just fine.