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  #1  
Old 02-17-2006, 12:30 PM
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Question Ignition Cylinder, Switch, or Housing?

Or all three? I'm interested in your opinion. Should I just replace the switch which I suspect, as have others here, to be the next probable cause of my occassional stumble/stall issue? Or since I'm "in there", replace the housing and cylinder as well? My vehicle is an 88' 560 SEL. Aside from the stumble/stall issue (two years now!), I noticed twice over the last two months that I had to manually turn the key left due to the starter staying engaged after release of the key. Additionally, the radio stayed on yesterday after the ignition was turned off and the key removed.

Thanks ahead of time for your opinions. I bought the 88 560SEL because of Mercedes' engineering but I keep the car because of the incredible expertise of the members of MercedesShop! Thank You!
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Old 02-17-2006, 12:47 PM
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The electrical portion of the ignition switch is the only part that can cause stalling.

IF you are having problems TURNING the key then replace ALL of the pieces.
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  #3  
Old 02-17-2006, 02:33 PM
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Thanks MB DOC -

Are you giving weight to my report that the ignition (key) had to be manually turned to the left to disengage the starter and/or that the radio stayed on after the ignition was turmed off and the key removed? If I am reading your reply correctly, you are suggesting replacing all three components - yes?

Thanks again for your insight.
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Old 02-17-2006, 09:17 PM
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What M.B. Doc says is correct. The electrical swithch is behind the lock itself. It is spring loaded to return to ON when the key is released after starting the vehicle. The radio staying on, after shutting off the ignition, tells you that there is a short in the switch. Replace the switch, behind the lock, and all will be well!
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Old 02-18-2006, 08:37 AM
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Thanks SatRoc and MBDOC. I'll order the switch today. Crossing fingers that this cures my intermittant stall issue.
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Old 02-18-2006, 10:54 AM
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You can replace that portion w/out total removal of the ignition switch.
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Old 02-20-2006, 08:24 PM
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Andmoon, still awaiting parts but it would seem all I need do is pull instrument cluster, steering wheel (air bag) and the ignition switch should reveal itself quite nicely - yes? The MB service manual seems to describe process fairly well. Have you a trick or two I'm all ears! Thanks.
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Old 02-23-2006, 04:52 PM
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Ignition Switch Replaced - 560SEL

Just completed the installation of a new ignition switch for my 88 560SEL. I followed the advise of andmoon but thought I'd add a couple of helpful hints:

1) Extend telescoping steeing to max out.
2) Place front seat in most rearward position.
3) Disconnect battery negative cable.
4) remove instrument cluster
5) turn key to #1 postion and remove plug in back of switch (turning key is required to "unlock" plug from switch).
6) Feel around (can't see due to angle) for allen bolt on top of ignition cylinder that mates with steering column and loosen (no need to remove)
7) remove two bolts (13mm) on top of steering column allowing column to drop about 3".
8) look for "release button" that resides on the steering column where ignition cylinder enters column. You'll see (need strong light) this release button as you look in-between the column and the 180 degree plastic trim piece that is attached to dash.
9) turn key to position #1 and push release button with a heavy wire while pulling ignition cylinder to right.
10) remove key to allow ignition cylinder to continue to the right.
11) orchestrate the complete assemply out through the instrument cluster opening.
12) you can proceed to remove old switch from ignition assembly with all accessory wiring to ignition cylinder remaining in place.

The new ignition switch does not have an enlarged white plastic "wing" that is in the original which required the key to be in position #1 for the plug to be removed.

Others are correct that in using this procedure, one does not need to remove the steering wheel nor the lower kick panel.

No I'll wait and see if this was the cause of my occassional stall/stumble. Fingers crossed!
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Old 05-11-2006, 04:31 PM
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It's now 11th May and having read the thread.........where's the ending? Like a 'who-dun-it' ; nicely built to a climax but.......????
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Old 05-28-2006, 12:44 PM
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The ending.....Sorry for the delay

But I've been busy enjoying my 560SEL! Finally I can report with a high degree of confidence that I have remedied the occassional stall/stumble issue with my 88 560SEL. The ignition switch did not cure it. I finally searched for a used EZL (ignition control unit). I found one on Ebay. It was a SIEMANS unit. The seller offered a 30-day warranty, which is most generous. I paid $175.00.

I installed it 3 months ago. The car has been flawless ever since. I have carefully evaluated the performance while experiencing all types of conditions - especially cold/wet weather - where my stumble stall would be most prevalent.

After two years - nirvana! Thanks to the many who offerred assistance.
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Old 01-08-2007, 08:20 PM
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Smile Mb 500sel

Hey Guys, I've Asked Elsewhere Here, But Told Take To Mb Shop. Can You Tell Me (diagrams Helpful) How To Remove The Ignition Cylinder For Replacement? Want To Give Replacing It Ourselves A Shot Before Towing It. Any Help Is Appreciated, Thanks!
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