недавно решал похожую проблему на W209
Очень похоже на мои недавние проблемы с CLK, W209, 2003 год.
Если это другая проблема - извините. Правильно сказать может только грамотный сервис.
При несильном ускорении, примерно от 1500 до 2400 оборотов, раздавался звук, как будто колесо попало на неровную поверхность.
Почитал интернет и нашел, что была проблема с
W203, W209, W211 выпуска до 2003 года - из-за бракованного радиатора Valeo антифриз попадал в гидротрансформатор и в АКПП. Проблема найдена в 2005м и признана мерседесом, но это не "отзыв".
Даже был сервис-бюллетень на эту тему - P-B-27.55/50a (текст ниже, на английском).
Официальный сервис составил список на замену: радиатор, гидротрансформатор и, если не повезло, то коробка. Главное - радиатор, иначе антифриз опять начнет протекать в АКПП и все по новой.
При этом на компьютере не было никаких ошибок!
Мне продавцы поменяли по своей гарантии, можно сказать повезло.
A/T - Harsh Engagement/Buzzing Noises
Date: February 17, 2005
Order No.: P-B-27.55/50a
Supersedes: P-B-27.55/50 dated January 27, 2005
Group: 27
Revision:
Additional Applicable Models, Parts and Warranty Tables Updated
SUBJECT:
Model 203.040/061/064/065/081/084/261/264/281/284/740/747/764
Model 209.365/375/376/465/475
Model 211.065/070/076/083/265/283
Up to Production Date 09/2003
Harsh Engagement Possibly Followed by Droning/Buzzing Noises During Light Acceleration Between Engine Speed of 1200 - 2500 RPM
If you receive customer reports in the above model vehicles of humming/buzzing noises or noticeable harsh engagement during gentle acceleration between engine speed of 1200 - 2500 rpm; this may be caused by incomplete adaptation of the torque converter, the transmission (EGS) ECU software or glycol contamination of the automatic transmission fluid. Follow the below repair procedures to resolve.
Note: The condition is not intermittent and can be reproduced at all times.
Note: The Glycol test must be performed only if:
a. the vehicle was produced before 09/2003,
b. the radiator is manufactured by "Valeo", refer to Figure 1 for identification.
c. old crimping method used to assemble the radiator end tanks resembles Figure 2.
Caution! It is mandatory to follow the process steps in sequence.
1. Clear all adaption values.
2. Verify if condition is still present
3. If condition is still present after clearing all EGS ECU adaption values, perform glycol test.
4. If condition is no longer present after clearing all EGS ECU adaption values, replace the EGS ECU with updated software with part number listed in the parts information table.
5. If condition reappears after EGS ECU software updates, perform glycol test.
Instructions for Glycol Test
Caution! Ensure that safety glasses and rubber gloves are worn when performing glycol test. This test should be performed in a clean and well ventilated area away from organic materials (rags, cardboard, oils and other chemicals). Refer to the Material Safety Data Sheets (MSDs) for additional safety measures.
1. Fill 0.5 ml of ATF with the pipette in the small glass container (Figure 4, 1).
2. Fill with distilled water to 5 ml (Figure 4, 2).
3. Add 1 drop of "Tenside" (Figure 4, 3).
4. Add 1 micro spoon of "Periodic acid" and rock the small glass container (Figure 4, 4).
5. Allow to stand for 5 minutes (Figure 4, 5).
Note: It is essential to comply with the specified standing time in step 5; otherwise the measured value result may be distorted.
6. Add 10 drops of "Natronlauge" or Caustic Soda Solution (Figure 4, 6).
7. Allow to stand for 3 minutes (Figure 4, 7).
Note: It is essential to comply with the specified standing time in step 7; otherwise the measured value result maybe distorted.
8. The sample is now divided into 2 layers; an upper and a lower layer. Immerse the syringe so that the end tip is into the lower layer of the sample and take up approximately 4 ml. of the lower layer using the syringe (Figure 4, 8).
9. Pour the fluid taken up through the filter into a clean small glass container (Figure 4, 9).
10. Immerse test sticks into the filtered solution for approximately 2 seconds, shake the stick and wait for a reaction time of one minute (Figure 4, 10).
11. Compare the color of the test sticks with the color chart on the test stick tube (Figure 4, 11).
Note: The colors of the color chart tube correspond to the amount of glycol contamination of the ATF. After completion of the test, the liquid in the two glass containers should be handled as a hazardous waste. Store in a sealed container and dispose of in accordance with all Federal, state and local hazardous waste regulations.
Perform repair based on the test result:
1. Up to 100 mg/liter of glycol contamination do not perform any repair (considered normal due to condensed water and not a leak).
2. As of 100 mg/liter up to 400 mg/liter of glycol contamination, replace radiator and torque converter. Clean and flush lines.
3. As of 400 mg/liter, replace radiator, torque converter and transmission. Clean and flush lines.
