Symptoms of slipping SC clutch (??) - Mercedes Benz SLK Forum

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#1 Old 06-11-2012
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Question Symptoms of slipping SC clutch (??)

2003 SLK32 AMG...

SYMPTOM: Driving up hill (2% grade) at 50 mph, I step on the gas. Floor it. Nothing. Just a slow increase in RPM, slowly pick up speed.

From a stop, I step on it. Lots of power, feel pushed back in the seat.

I'm wondering if the supercharger clutch ever slips... or just isn't doing it's thing all the time?

Or am I expecting something this car isn't going to deliver? It just seems very odd that there's no power going up a relatively minimal grade when I step on the gas.

Anyone have any ideas?

Should I take the car in and have it evaluated by a mechanic?

Before I do that, I'm looking for some insight into how the supercharger is supposed to work on this car. R170.

Thanks in advance!

Tom
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#2 Old 06-11-2012
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How has it been behaving up until now? On the flat? I'm wondering if the waste gate is stuck open?


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#3 Old 06-11-2012
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I misread that. Didnt see the SC
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#4 Old 06-12-2012
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Does it on the flat, too. Doesn't have to be a hill. Just have to be cruising about 40 or 50 mph and then try to get going and no.... I.... don't.... want.... to..... move.... very.... fast..... weird. Did it again today. But then, if you just punch it off the start, it hauls like crazy.

??????????????
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#5 Old 06-12-2012
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Quote:
Originally Posted by tglander99 View Post
2003 SLK32 AMG...

SYMPTOM: Driving up hill (2% grade) at 50 mph, I step on the gas. Floor it. Nothing. Just a slow increase in RPM, slowly pick up speed.

From a stop, I step on it. Lots of power, feel pushed back in the seat.

I'm wondering if the supercharger clutch ever slips... or just isn't doing it's thing all the time?

Or am I expecting something this car isn't going to deliver? It just seems very odd that there's no power going up a relatively minimal grade when I step on the gas.

Anyone have any ideas?

Should I take the car in and have it evaluated by a mechanic?

Before I do that, I'm looking for some insight into how the supercharger is supposed to work on this car. R170.

Thanks in advance!

Tom
Others, I'm sure, will chime in, but I chased a similar problem. There seems to be multiple possibilities for this issue.

I replaced the I/C pump and though it did help a little it didn't completely fix it. I re-soldered the K40 relay (don't know if that was even a problem, but figured, what the heck).

Then I stumbled on a thread that dealt with the Throttle Position Sensor. In addition to what I assumed was an SC problem (lack of power, limp mode, having to ease into the throttle), my engine would surge a wee bit while driving, when there was no change in input to the pedal.

I put my scanner on the car, drove it and could see the throttle position jump 10-20% for no reason. I also noticed that with the pedal to the floor, I was only getting about 80% according to the scanner. Another clue: if I performed the TPS reset procedure, the car would perform well for a few runs, but then would go back to the hiccup mode.

So....I replaced the pedal assembly (it's sold as a complete unit with both the TPS and the kickdown switch) and problem solved.

If you have access to a scanner, I would check to see if you're getting any codes. I was getting the P0123 for TPS high voltage (I think). Plus the screwy numbers coming out of the live scanning pushed me to the TPS conclusion.

Hope this helps.
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#6 Old 06-13-2012
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I have a device that plugs into the OBDC on a chevy, ford, toyota, etc., but I don't see an OBDC on the MB... is it hiding somewhere? I could try that if it will work.

Thanks for the help so far. I have the same "odd surge in power" on occasion as well. That throttle position sensor might be an issue.

Does anyone know where this sensor is located? And where I might obtain one if it is indeed the issue?

This is a great group of people. Thanks to all so far. If I pin down this problem, and am able to solve it, I will provide the cure with photos for all to benefit from.

Thanks again.

Tom
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#7 Old 06-13-2012
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Originally Posted by tglander99 View Post
I have a device that plugs into the OBDC on a chevy, ford, toyota, etc., but I don't see an OBDC on the MB... is it hiding somewhere? I could try that if it will work.

Thanks for the help so far. I have the same "odd surge in power" on occasion as well. That throttle position sensor might be an issue.

Does anyone know where this sensor is located? And where I might obtain one if it is indeed the issue?

This is a great group of people. Thanks to all so far. If I pin down this problem, and am able to solve it, I will provide the cure with photos for all to benefit from.

Thanks again.
Tom
The OBDCII port is under the driver's knee bolster behind the hood release. It has a small plastic door over it for protection.

The accelerator pedal assembly is part number A1703000104 and can be purchased here: Pedal

I don't believe you can purchase just the TPS, AFAIK, you have to buy this whole assembly. Installation is easy, though getting the old pedal out may require cutting it apart...there are threads with the DIY instructions.
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#8 Old 06-15-2012
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Quote:
Originally Posted by rfourt View Post
Others, I'm sure, will chime in, but I chased a similar problem. There seems to be multiple possibilities for this issue.

If you have access to a scanner, I would check to see if you're getting any codes. I was getting the P0123 for TPS high voltage (I think). Plus the screwy numbers coming out of the live scanning pushed me to the TPS conclusion.

Hope this helps.
Thanks for that.

I found a device I purchased in the past from Innovate Technology. There's an app for your iPhone that's free, but the tuner part that plugs into the OBDC port is a purchase.

I plugged it in (thanks to those who steered me in the proper direction to find the port) and it connects via WiFi to my iPhone. There are numerous cool features with this device. I've captured some screens for you to see:

Here is the trouble code section (no problems reported):



Fuel economy section below:



RPM section:



Finally, a graph from a run I took up the street in my neighborhood. Just testing this out. It's full of great information:



I didn't know this would work on my SLK32 AMG... but it works great. I believe the cost was only $145 when I purchased. Again, the app is free for the iPhone. I don't know if they have an app for Android phones or not.

The device works by WiFi. Just don't leave it plugged in and forget about it. I ran down the battery on a Mazda RX8 be leaving it plugged in and forgetting about it. I couldn't figure out why the battery kept running down. I'd forgotten all about the device, tucked up under the dash...

Anyway, if anyone wants a slick, inexpensive system for checking out many things on their car, this will do it. The website is tuneyourengine.com. I have the OT-2 Scan Tool, which is shown above in screen captures.

Hope someone finds this info helpful. I've even cleared engine trouble codes using just this device. Very helpful in that respect.
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#9 Old 06-16-2012
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Looks cool! I like the graphing capabilities. I've got a "hard wired" device from GoPoint for my iPhone. It works well, but the choices of 3rd party apps is rather limited since most apps require WiFi or Bluetooth. I would definitely go wireless if I was doing it again.

As for the original issue: did you see any strange throttle input numbers? On mine the code only got thrown after a really severe episode where the car ended up in limp mode. Just curious if you got your baby running 100%....
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#10 Old 06-16-2012
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Quote:
Originally Posted by rfourt View Post
Looks cool! I like the graphing capabilities. I've got a "hard wired" device from GoPoint for my iPhone. It works well, but the choices of 3rd party apps is rather limited since most apps require WiFi or Bluetooth. I would definitely go wireless if I was doing it again.

As for the original issue: did you see any strange throttle input numbers? On mine the code only got thrown after a really severe episode where the car ended up in limp mode. Just curious if you got your baby running 100%....
I haven't seen any codes yet, but will test harder. There are still odd little surges, ever so slight, not very frequent. Just very odd.

Also, there's a strange thing on the floor where the gas pedal clicks into. A button of sorts. When you press the pedal to the metal (plastic) it'll click if you press it all the way. Photo below.

I don't know... someday the answers will present themselves. Meantime, thanks for the ideas and help.

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#11 Old 06-17-2012
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That's the "kick down" switch. It tells the ECU that you've "floored" the accelerator and generally results in a downshift in the transmission.
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#12 Old 06-18-2012
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Very good, makes sense. I guess if I had an actual manual for this car, I could read this stuff and find out. I'll have try out flooring it to activate that switch and see what happens.
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#13 Old 06-18-2012
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Originally Posted by tglander99 View Post
Very good, makes sense. I guess if I had an actual manual for this car, I could read this stuff and find out. I'll have try out flooring it to activate that switch and see what happens.
You can download a owners manual (free from M.B.) using the 1st link in my signature.


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