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  #1  
Old 10-19-2001, 12:16 AM
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Join Date: May 1999
Location: So Kalifornia
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MB Doc - diagnostic champ!

In July I asked some general questions about the trans in my newly acquired C230. MB Doc replied: The Trans SHOULDN'T make any "clunk" when slowing down!! Can be signs of early valve body / computer mis-communication.

You are still batting 1000! The dealer ran their checks, and found a 'faulty trans controller unit and valve body', which are being replaced under warranty.

This site and the experts who contribute have saved me large sums of money in the last few years. the accuracy of the information was validated by the reactions at the dealership when I handed them my list, which included:

#2) AC sometimes only blows warm or tepid air, even after the car has been driven a while (25 miles).
The #6 AC display sometimes shows '147' even on a turned off, cold engine. (Evaporator sensor?)
#6 display ranges from 50 - 202 most of time.

#3) Transmission 'clunks' loudly when coming to a stop, jerking the car as if it downshifted to first while braking to a stop - is this normal? Valve body/computer mis-communication?

Both of these issues were items that were threads on this that gave me valuable insight into the workings of my wife's car. On each of these issues, the expertise of this forum rocks. The dealership confirmed AC evaporator sensor required replacement, and equally confirmed MB Docs long distance diagnosis of trans controller unit/valve body.

Some hesitation and funny looks occured when I presented the graph of the "#6 AC display data oscillations. They asked what #6 meant. I explained that I was talking about #6 on the 'hidden' data display on the AC (documented by Stevebfl and expanded upon by David C Klasse on previous threads), the service writer looked at me and asked if I were a Tech! (the nucleus of a lynch mob starts to form as 2 other service writers gravitate closer). I explained I had learned about it on the internet (pained looks all around - 'another one of those' was unspoken.) I said Mercedesshop dotcom, and one of the service writers said 'hey, I've been there - neat site!')

Thanks again for all the help from the people who run this forum, and all the gifted Techs and talented DIY people who help the rest of us limp through repairs!
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2003 Firemist Red/grey leather SL 500
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  #2  
Old 10-19-2001, 01:14 AM
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John:

It didn't make the clunk at every stop, or even every 10th stop. the feeling was rather as if just before (10-15 feet?) coming to a stop, the trans decided to shift down to first quite harshly and engine brake you to a stop. No real rhyme or reason that I could discover, save for a slight (imagined?) tendancy to do it more often on firm stops. I haven't had the car long enough to notice it getting worse - 3 months.
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2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
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  #3  
Old 10-24-2001, 01:53 AM
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I got the C230 back today after the trans parts came in. apparently there is an 'updated trans control unit' as well as an 'updated valve body' for the trans, and a D&A from valve body. The invoice says "check for codes. 161 065 098 099 100 102 104. Signal wire from N15/3 control module to Y3/16 valve body circuits going open intermittently. Found Y3/6Y3 Solenoid Valve and Y3/6Y6 Torque Converter lock up valve reading erratic resistance. replace Trans control Unit with update, replace valve body with update, D&A valves from valve body, remove portion off back side.

Since it was covered under warranty, I don't think the last sentence was referring to me :p .

Hope this helps someone, and thanks again for the help from this site.
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2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
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  #4  
Old 12-03-2001, 12:02 AM
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Thumbs up It's Back

Well, the tranny problem may be coming back:

1) One occurance: starting from a stop, at less than 2-3 miles per hour, Leise had to apply the brakes suddenly for a car that ran the red light in front of us. Her foot was not on the gas, but the car surged very slightly forward twice while the brakes were applied, with a clunk each time!

2) Occasionally, while accelerating normally and with the trans shifting through the gear ranges normally, she has had to suddenly apply the gas firmly to avoid traffic situations. On several occasions the car has made a "engine roaring" sound and the tach needle climbs rapidly, but acceleration doesn't change!

MB did the repairs a while back, and said it would need to be driven 800 miles to relearn her driving habits, but it goes back in Tuesday. Any ideas? Please?
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2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
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  #5  
Old 12-03-2001, 06:17 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
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If the transmission was not properly adapted from the dealer, you could have these symptoms. I would give it a little while.

It takes time for the adaptation to take place. If you drive for a week or two and still have problems, then go to the dealer.
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