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2006 SLK280
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257 Posts
Discussion Starter · #1 ·
I have a very frustrating problem that I need help with. My 2006 280, 6speed starting having a starting problem about 6 months ago. It would either do nothing or crank and then nothing. It always started after a couple of tries. Sometimes it starts perfectly on the first try. This is not every time but on occasion. When it does start, it does so as usual with no slowness or anything unusual.

I started trying to fix the problem starting from cheapest to most expensive. This is what I've done so far:
1. Replaced the clutch safety switch
2. New battery
3. New starter
4. New alternator

The problem still persists. Now I also get a battery/alternator message on occasion. Also, I will get a ESP or ABS not available after start, on occasion. I'm pulling what little hair I have out trying to figure out what is going on. Can anyone point me in right direction to check?

Thanks.
 

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*DAS/STAR Premium Member
2005 SLK55 AMG
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4,038 Posts
That sounds like you may have a bad earth (ground) connection somewhere
 
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Registered 2000 SLK320
Joined
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348 Posts
I have a very frustrating problem that I need help with. My 2006 280, 6speed starting having a starting problem about 6 months ago. It would either do nothing or crank and then nothing. It always started after a couple of tries. Sometimes it starts perfectly on the first try. This is not every time but on occasion. When it does start, it does so as usual with no slowness or anything unusual.

I started trying to fix the problem starting from cheapest to most expensive. This is what I've done so far:
1. Replaced the clutch safety switch
2. New battery
3. New starter
4. New alternator

The problem still persists. Now I also get a battery/alternator message on occasion. Also, I will get a ESP or ABS not available after start, on occasion. I'm pulling what little hair I have out trying to figure out what is going on. Can anyone point me in right direction to check?

Thanks.
Have you tried connecting an OBD reader and checking the fault codes, the problem has some of the characteristics of the crankshaft sensor starting to fail.
OBD readers are available cheaply £12.00 on eBay best thing I ever bought.

Takes a lot of the guesswork out.

Regards Stuart.
 

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*Premium Member
2004 SLK200K
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10,777 Posts
The problems sound very battery related, have you checked the new battery is ok, sometimes they come bad, and definately check all the earth connections as Sean suggested, I seem to remember a similar problem posted recently that was a bad earth in the end....
 

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* Founding Member #2
2008 SLK55 AMG
Joined
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19,485 Posts
As others have stated: do a conductive test on the "new" vehicle battery and make sure all the connections are good and secure with no corrosion.
 

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Registered 2000 SLK320
Joined
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348 Posts
I have a very frustrating problem that I need help with. My 2006 280, 6speed starting having a starting problem about 6 months ago. It would either do nothing or crank and then nothing. It always started after a couple of tries. Sometimes it starts perfectly on the first try. This is not every time but on occasion. When it does start, it does so as usual with no slowness or anything unusual.

I started trying to fix the problem starting from cheapest to most expensive. This is what I've done so far:
1. Replaced the clutch safety switch
2. New battery
3. New starter
4. New alternator

The problem still persists. Now I also get a battery/alternator message on occasion. Also, I will get a ESP or ABS not available after start, on occasion. I'm pulling what little hair I have out trying to figure out what is going on. Can anyone point me in right direction to check?

Thanks.
As well as checking for a bad earth, check the positive terminal, and the "main" fusebox which holds the fuses for the radiator fan, roof pump and a 200 amp fuse for everything else, check the 200 amp fuse, make sure it can't move about.

Regards Stuart.
 

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*Registered
2006 SLK280
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257 Posts
Discussion Starter · #8 ·
I'll go through all suggestions. The battery was checked and found to be functioning properly. I do have a crank position sensor sitting here waiting to be installed. I figured it's worth a shot.

There are no codes relating to this problem. My code reader shows only one code for a bad tumbler flap. I have the repair kit here and will do that and the cps at the same time.
 

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*Premium Member
2005 SLK350
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2,562 Posts
I'll go through all suggestions. The battery was checked and found to be functioning properly. I do have a crank position sensor sitting here waiting to be installed. I figured it's worth a shot.

There are no codes relating to this problem. My code reader shows only one code for a bad tumbler flap. I have the repair kit here and will do that and the cps at the same time.
The generic code reader will only read engine fault codes (some may read a couple of others, but not much). To get a full read of all the fault codes an SLK can have from all the various control modules, the car will need to be connected up to the MB Star Diagnostic System (DAS). If, for example, the electronic ignition switch was failing you would see a fault codes showing issues with that component. As you have already found out, you can throw a lot of parts (and money) at the car and not fix the problem. A good session with DAS will likely put you on the right path of finding the real issue.
 

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*Registered
2006 SLK280
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257 Posts
Discussion Starter · #10 ·
The generic code reader will only read engine fault codes (some may read a couple of others, but not much). To get a full read of all the fault codes an SLK can have from all the various control modules, the car will need to be connected up to the MB Star Diagnostic System (DAS). If, for example, the electronic ignition switch was failing you would see a fault codes showing issues with that component. As you have already found out, you can throw a lot of parts (and money) at the car and not fix the problem. A good session with DAS will likely put you on the right path of finding the real issue.
I think you're right. I will make an appointment to have it checked and see what shows up.
 

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*Registered
2006 SLK280
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257 Posts
Discussion Starter · #13 · (Edited)
In another thread he says dealer replaced EIS module and starting prob solved.

Ed



Sorry to not update my thread. Yes, taken to dealer who confirmed it was the EIS module. Replaced and now starting perfectly. Very expensive job and they had the car for two weeks. It took one week for the car to act up and not start. They started the car multiple times per day while hooked up to the computer. The day it didn't start the computer was reading no start code being sent from the EIS. It took another week for them to get the new EIS module in and then install.
 
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