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Discussion Starter #1
Hoping for some ideas:

When I first turn the ignition key to the start position, there is a loud clunk in the glovebox, and the car starts but immediately dies. If I then turn the ignition key off and to start again, the car starts and runs no problem.

I have learned that if I turn the ignition key to the accessory position first, and wait for the clunk sound, then I can turn the key to start and the car will start and run no problems (thus bypassing the start and die phase).

The MB dealership that inspected the car had no clue, other than to let me know there are no codes being pulled.

Ref: 2001 SLK320, 6spd, Sport/AMG

Thank for any suggestions!

Coop
 

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Registered 2005 SLK200
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Hoping for some ideas:

When I first turn the ignition key to the start position, there is a loud clunk in the glovebox, and the car starts but immediately dies. If I then turn the ignition key off and to start again, the car starts and runs no problem.

I have learned that if I turn the ignition key to the accessory position first, and wait for the clunk sound, then I can turn the key to start and the car will start and run no problems (thus bypassing the start and die phase).

The MB dealership that inspected the car had no clue, other than to let me know there are no codes being pulled.

Ref: 2001 SLK320, 6spd, Sport/AMG

Thank for any suggestions!

Coop
The only idea I have is to check the airbag, it could somehow mess with the electronics.
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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the compartment air filter is in that general area. maybe it is no longer seated properly and when car started it gets reseated by air suction?
 

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the compartment air filter is in that general area. maybe it is no longer seated properly and when car started it gets reseated by air suction?
That is a a good suggestion. You can easily check that by yourself. There is a DIY link somewhere here about the removal of the glove box.
 

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aka John
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Not sure the inside air filter for the A/C would cause the A/C to die, but it's a MB, so anything is possible...

You don't have an aftermarket immobilizer or tracker fitted, do you?
 

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Discussion Starter #6
Thanks for the feedback!

the compartment air filter is in that general area. maybe it is no longer seated properly and when car started it gets reseated by air suction?
Excellent point; I'll follow the DIY for removing the glovebox and check this tonight. As a side note, the A/C works perfectly (although I have no idea about the passenger airbag; if this was having an issue it would throw a code though right? I know there are no codes currently).

Thanks!
 

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Registered 2005 SLK200
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Yes, it should throw a code, but there is a possibility it wouldn't. When you remove the glove box, you will see the airbag as well, so you can check both of those items simultaneously...
 

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gotta ask - what would make an airbag "clunk"? ;-)
I have noticed that when you turn the key, there is a slight somehow rough noise from the airbags, like they are adjusting themselves (backwards or forward, I don't know). But there is some kind of a movement sound coming from them.

That's why, they came into my mind at first... A short circuit is possible or something like that (the PC floppy sometimes makes the similar sound as described when there is a short circuit)...
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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floppy? what's that? Just kidding!!!!
 

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aka John
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I'm more with efair on this one. There *should* be no noise from the airbags, as they simple have an explosive charge in them waiting to go of, and are extremely tightly packed.

I can very easily think of the CD-Changer in an R171 glovebox making noise as it powers up, or the internet one in the radio if it had a disk in it...


But again - on an R170 the changer is in the boot, and I don't see how that could stall the car.

I'd personally have someone else start the car while I was standing by the passengers side with the hood open. It's much more likely something preventing the car from running is under the hood!
 

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. . . When I first turn the ignition key to the start position, there is a loud clunk in the glovebox, . . . .
From the glove box? or the (rear) Console compartment? If it's the latter, it's the central locking doing the pneumatic lock. (It thunks a bit and depending on how you have it set up, does it on every start up!)

I don't believe the locking on the glove box works the same way (W/pnuematic lock) but if it does, it would probably clunk as well.

Shouldn't have anything to do with the starting though.
 

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Discussion Starter #16
Update! Fixed!!

Yesterday I took out the MAF, cleaned it with CRC MAF Cleaner, replaced it, and then disconnected the battery for about a minute to reset things. As of today, the clunk is gone and the car is driving much better (although I suspect the MAF will require replacement...cleaning made a huge difference, but it's not 100%).

The clunk was absolutely related to the A/C system, as I could replicate it by hitting the air circulation button on the dash when driving. No idea why it was causing the car to not start, or why cleaning the MAF stopped the clunk from happening when I start the car.

I love that the SLK is easy enough to work on, but I hate that the computer controls the car so much. I guess I'm just used to working on old Jeep Willys, where there is nothing finicky...it either runs or doesn't.
 
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