Mercedes SLK World banner

Status
Not open for further replies.
1 - 20 of 24 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1
I just bought a 2001 SLK230 and it has not been taken care of. On my first highway drive I was pulling 4000 rpms at 60mph. Thought that was high. Then the next day I took it out again and was pulling around 2200 rpms at 60mph. Much better. Then after taking off from a red light it went back to 4000 at 60mph. Did the transmission reset and it was back to 2200 until taking off from another red light awhile later. Any idea what is happening? I'm stumped.
 

·
Banned
Joined
·
2 Posts
Seeing as you said that he car has not been looked after - the First thing I would do is perform
a transmission service. Change the oil and filter and go from there - it may be something as simple
as a stuck solenoid which may free up with fresh fluid/filter.
 

·
Administrator 2009 SLK 55 AMG/Founding Member 2006
Joined
·
98,412 Posts
Seeing as you said that he car has not been looked after - the First thing I would do is perform
a transmission service. Change the oil and filter and go from there - it may be something as simple
as a stuck solenoid which may free up with fresh fluid/filter.
Welcome to SLKWorld.com: The #1 Mercedes-Benz SLK Forum from Florida!

First please update your location and vehicle (Put Looking!)(year?: 1996-2017, model?: 32, 200, 230, 250, 280, 300,320,350,55) in your profile as it helps the members answer your questions which usually are based on that information if you haven’t. This takes about 30 seconds to do.
Follow exactly to update: ‘Usercp’ at the top of page, then ‘edit your details’ on the left side, ‘additional information’ near the bottom, edit your ‘location’ and ‘vehicle’. Info in your garage does not update your profile.

Join the gang! Your 1st thread should be your introduction so we can welcome you properly so post an introduction in the ‘New members introduce yourself here’ section, if you haven’t already. New Members Introduce Yourself Here - Mercedes Benz SLK Forum


Some tips to make your visit here more enjoyable:
If you haven’t, please use the 'search' feature at the top right of the page for your questions as they have probably been asked before. Remember, ‘Search’ is your friend.
If you wish to become PM (Private Message) capable or to ‘edit’, you need 15 posts. To get those 15 posts quickly, just go to the ‘New members introduce yourself here’ section and welcome enough new members to obtain your needed posts to PM/edit. You can always pm a moderator.
Want to post a picture? Start a new thread or make a post, click ‘edit’, click on the ‘paper clip’ or ‘advanced’ and/or ‘manage attachments’ then ‘choose file’ then ‘upload’ and ‘submit’! If Iphone pics, you need to rename any additional pics as Iphone names its pics all the same, image.jpg.
Want to ‘like’ or thank’ someone’s comments? Use the ‘like’ button to the right or the ‘Thanks’ button, bottom right of any post you like. This saves you having to comment.
New members should be aware that the 'New Posts' link next to the 'Search' link top right of the info bar is a great way to see all of the posts you have missed since you were on the forum last. Remember to click 'mark forums read' under ‘quick links’ when you leave.
FREE!! Post your vin in the Vehicle Datacard Request section to get a free datacard (options on your car). You must update your profile with vehicle info and your location and post an introduction first.
http://www.slkworld.com/vehicle-data-card/67706-free-how-get-free-datacard.html

Thank you
Jeff
Moderator/Founding Member/Ride of the Month Coordinator
 

·
Administrator 2009 SLK 55 AMG/Founding Member 2006
Joined
·
98,412 Posts
I just bought a 2001 SLK230 and it has not been taken care of. On my first highway drive I was pulling 4000 rpms at 60mph. Thought that was high. Then the next day I took it out again and was pulling around 2200 rpms at 60mph. Much better. Then after taking off from a red light it went back to 4000 at 60mph. Did the transmission reset and it was back to 2200 until taking off from another red light awhile later. Any idea what is happening? I'm stumped.
Try this and use the proper grade gasoline

http://www.slkworld.com/general-discussion/70666-reset-transmission-adaptive-learning.html
 

·
Registered
Joined
·
11 Posts
Discussion Starter #5
Seeing as you said that he car has not been looked after - the First thing I would do is perform
a transmission service. Change the oil and filter and go from there - it may be something as simple
as a stuck solenoid which may free up with fresh fluid/filter.
Okay I will do that. Is there anything else I should change out while I'm doing that? Somebody thinks it may be a speed sensor? I'm very new to these cars.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #6
I just bought a 2001 SLK230 and it has not been taken care of. On my first highway drive I was pulling 4000 rpms at 60mph. Thought that was high. Then the next day I took it out again and was pulling around 2200 rpms at 60mph. Much better. Then after taking off from a red light it went back to 4000 at 60mph. Did the transmission reset and it was back to 2200 until taking off from another red light awhile later. Any idea what is happening? I'm stumped.
Try this and use the proper grade gasoline

http://www.slkworld.com/general-discussion/70666-reset-transmission-adaptive-learning.html
I did this and it worked fine till a bit down the road when I had to come to a complete stop for a red light. After take off it was back to pulling 4000 rpms at 60mph. Does it require multiple resets?
 

·
Administrator 2009 SLK 55 AMG/Founding Member 2006
Joined
·
98,412 Posts
no only 1 reset

do a transmission service if you have no idea when it was done last
 

·
Premium Member 2005 SLK55 AMG; 2005 SLK350
Joined
·
5,143 Posts
First and foremost, you need to check for transmission fluid wicking through your "pilot bushing" into your wiring harness and further into your transmission computer. The pilot bushing is where the wires enter your transmission, it's a plastic electrical connector with rubber seals designed to prevent fluid leakage. They frequently go bad, and when they do, transmission fluid will wick through your wiring harness all the way up to your transmission computer and cause all kinds of weird behavior. You should inspect your bushing from under the car - feel for any oily fluid on the wires. Next pull your passenger carpet back, remove the styrofoam, free your equipment bridge (3 10mm plastic nuts) and lay the bridge down in the floorboard so that you can see the yellow padding. If the yellow padding has any red stains near the wires - bingo - replace the pilot bushing. You might be able to salvage your transmission computer by disassembling and cleaning it, but usually replacement is required once it gets to this. It's a straightforward swap, no coding or computer work required.

I've also had to replace a conductor plate to straighten out one of these transmissions - this just adds a few extra minutes to a transmission service. IIRC these plates cost about $100 USD and are very easy to replace - again with no coding or computer work required.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #11
First and foremost, you need to check for transmission fluid wicking through your "pilot bushing" into your wiring harness and further into your transmission computer. The pilot bushing is where the wires enter your transmission, it's a plastic electrical connector with rubber seals designed to prevent fluid leakage. They frequently go bad, and when they do, transmission fluid will wick through your wiring harness all the way up to your transmission computer and cause all kinds of weird behavior. You should inspect your bushing from under the car - feel for any oily fluid on the wires. Next pull your passenger carpet back, remove the styrofoam, free your equipment bridge (3 10mm plastic nuts) and lay the bridge down in the floorboard so that you can see the yellow padding. If the yellow padding has any red stains near the wires - bingo - replace the pilot bushing. You might be able to salvage your transmission computer by disassembling and cleaning it, but usually replacement is required once it gets to this. It's a straightforward swap, no coding or computer work required.

I've also had to replace a conductor plate to straighten out one of these transmissions - this just adds a few extra minutes to a transmission service. IIRC these plates cost about $100 USD and are very easy to replace - again with no coding or computer work required.
Thanks for the advice! I will look into that today.
 

·
Premium Member 2013 SLK250
Joined
·
2,444 Posts
When driving at 60 mph and turning 4k have you tried to tap the level to up-shift to a higher gear. Should tap to the "+" toward the right to see if it will shift into a higher gear.
 

·
Registered
Joined
·
559 Posts
When driving at 60 mph and turning 4k have you tried to tap the level to up-shift to a higher gear. Should tap to the "+" toward the right to see if it will shift into a higher gear.
I was thinking the same thing. Are you inadvertantly selecting manual mode? You have a gear indicator on the dash. If you are in fully automatic mode, it will say 'D". If you've bumped it to manual, it will read the gear number you've selected. I'd start here though it also makes sense to service the trans especially as it's history is somewhat unknown.
 

·
Super Moderator UK SLK 55 AMG 2007
Joined
·
28,770 Posts
Seeing as you said that he car has not been looked after - the First thing I would do is perform
a transmission service. Change the oil and filter and go from there - it may be something as simple
as a stuck solenoid which may free up with fresh fluid/filter.

Thank you for joining SLKworld.

The forum is a friendly site so please join in.

All models of the SLK/C are welcome.
Even if you are searching for your next car and do not yet own an SLK you are welcome to join in.
The information people offer when you want to know what to look for can be a big help
in getting the right car.

If English is not your first language we will try to help.

It helps the site to grow when you post an introduction
and shows appreciation for the very good information and help our posters give.

Your first thread should be your introduction so we can welcome you properly, so please post an introduction in the ‘New members introduce yourself here’ section, if you haven’t already. http://www.slkworld.com/new-members-introduce-yourself-here/


Plus, you can then enter our FREE competition to win goodies:
http://www.slkworld.com/rotm-submissions-voting/
Or vote after the 15th of the month.

Hope to see you on the site,

Myk
 

·
Registered
Joined
·
11 Posts
Discussion Starter #15
When driving at 60 mph and turning 4k have you tried to tap the level to up-shift to a higher gear. Should tap to the "+" toward the right to see if it will shift into a higher gear.
I was thinking the same thing. Are you inadvertantly selecting manual mode? You have a gear indicator on the dash. If you are in fully automatic mode, it will say 'D". If you've bumped it to manual, it will read the gear number you've selected. I'd start here though it also makes sense to service the trans especially as it's history is somewhat unknown.
I have tried that. I can't even get it into manual shift mode. Always just says "D"
 

·
Registered
Joined
·
559 Posts
I have tried that. I can't even get it into manual shift mode. Always just says "D"
Okay, that's a pretty big clue. It's unlikely it's a faulty trans. These things are pretty bullet proof. It could be the shift module itself. While that's fairly expensive, it's pretty easy to replace. A couple other questions. Do you have the ability to scan for possible codes?
 

·
Registered
Joined
·
11 Posts
Discussion Starter #17
I have tried that. I can't even get it into manual shift mode. Always just says "D"
Okay, that's a pretty big clue. It's unlikely it's a faulty trans. These things are pretty bullet proof. It could be the shift module itself. While that's fairly expensive, it's pretty easy to replace. A couple other questions. Do you have the ability to scan for possible codes?
No I don't have any access to a scan tool unfortunately.
 

·
Registered
Joined
·
1,613 Posts
No I don't have any access to a scan tool unfortunately.
I used Torque app for Android and a $15 small OBDII scanner from EBAY to reset my error codes. Worked every time for me! :grin: What I did was to reset all error codes. Drive about 200 miles (you need to drive certain # of miles for your computer to adjust after reset). Then check for codes again. If something returns then you need to investigate further by searching the code via google.
 

·
Registered
Joined
·
628 Posts
You don't say how many miles are on the car.

Automatic transmissions on Mercedes cars from the late 1990s to about 2007 or 2008 are often left un-serviced, even by the dealership service teams, because MBZ removed the transmission service entry from the recommended service list for those years in order to compete with other car makers' claim of "No service required!"

The automatic transmissions should *always* be given a lubrication service at 40,000 mile intervals (drain old, contaminated oil, replace filters, refill). Most of the transmissions will last through two missed transmission services, but a large number of them then have transmission problems starting around 100,000-115,000 miles. This usually means a $4K to $8K transmission replacement, for any shop where the mechanic is unwilling to overhaul the old transmission at a reasonable rate; they just replace it with a new or remanufactured transmission. (A good shop and a knowledgeable mechanic can usually do an overhaul on the bench for around $3K or so, but this is becoming rare to find because it is quite time consuming to do and locks up a service bay while the car is apart...)

The behavior you describe sounds like it could be one of or a combination of a couple of things:

  • gear selection mechanism clogged up and working inconsistently
  • valve body damaged or worn
  • clutch packs in the transmission worn out
  • insufficient fluid level or clogged filter not allowing trans to maintain proper operating pressures for the mechanism
The very first thing to do, however, is to pull a sample of the transmission oil and examine it for current condition. If it smells burnt, it's at least worn out. If it feels gritty or larger bits of metal/friction material come out with it, and the mileage is high, the likelihood is that the transmission needs an overhaul. Changing the oil and filter could restore consistent, proper operation for a while, but depending upon mileage, it might not last long.

My SLK280 had 85,000 miles on it when I bought it. I had the automatic transmission oil checked when I had the pre-purchase inspection done. It smelled slightly burnt and very slightly gritty, but analysis showed no metallic content and the shifting seemed sound. I had the transmission service done immediately after buying the car, with an extra flush of fresh oil, and no significant crud came out. Since I did that, the transmission's behavior has been transformed: it feels like a different car, shifts consistently and crisply in both C and S modes, up and down shifts manually perfectly. Even the service is somewhat expensive (about $700) but once every 40,000 miles is well worth the price—it should allow the transmission to last 300,000 miles or more.

Good luck with it! Take it to a qualified Mercedes-Benz independent shop ... they'll generally cost a lot less than the dealer and often give better, more informed service.

G
 

·
Registered
Joined
·
11 Posts
Discussion Starter #20
So I ordered a new conductor plate and tranny fluid for my slk230. Just got to thinking and I bought this car with 20" rims and low profile tires. Could the change in size be what's causing my tranny to shift at higher rpms? I planned on putting stock wheels and tires on it anyways. Should I do this before I change out conductor plate to see if it helps?
 
1 - 20 of 24 Posts
Status
Not open for further replies.
Top