Replaced neutral saftey switch NSS but starting now erratic - Mercedes-Benz Forum
 
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#1 (permalink) Old 09-24-2009, 11:24 AM
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Replaced neutral saftey switch NSS but starting now erratic

My E320 sedan was having troubles starting so I would have to start in it neutral. Then it dies completely and would not start.

I put in a new switch and followed the procedures on this site - alignment tool in the proper place - replaced shifter bushings and all that. Then it started right up no problem and tested neutral start - all good. Drove it today to work and at lunch it would not start... I kept trying it and on like the 50th try it finally did. So I took it home and there it sits.

What else does the car need to start?

To test the switch I turned the ignition to the 'start' position (and held it there) and then moved the lever out of P all the way past N down to 2. Now if it were an alignment problem at some point moving it past neutral it would have started correct?

So what else could it be? OVP? bad wire leaving the NSS - bad NSS?

tnks al for your help..
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#2 (permalink) Old 09-25-2009, 06:23 AM
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Define "it won't start". Does the starter crank or is it completely dead?
If dead, you can jumper the starter (3 pin connector close to the brake master cylinder close to the firewall; middle or purple wire, to the +12V battery terminal) and see if the starter cranks. I've done this on my car so many times that now I permanently wired a remote switch to said pin so that if the NSS fails again, I can jumpstart it quickly. You need to put the key in the starting position or the car won't start regardless of the jumper.

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#3 (permalink) Old 09-29-2009, 08:32 AM
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Thanks Sergio - sure enough that purple wire does indeed start the car! I might just put a doorbell switch somewhere to start the car - I am tired of fighting this damn NSS thing...
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#4 (permalink) Old 09-29-2009, 12:57 PM
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are you sure the problem is not in the ignition tumbler (cylinder)? My w210 did the same...
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#5 (permalink) Old 09-30-2009, 07:45 AM
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Quote:
Originally Posted by zviratko View Post
are you sure the problem is not in the ignition tumbler (cylinder)? My w210 did the same...
In my case it was the NSS. After replacing it for the second time, it now starts normally without the need for the tricked out switch.

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#6 (permalink) Old 06-23-2010, 03:47 PM
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E320 Starting probs. NSS repl procedure? Dignostics?

How did you find the NSS replacement procedure on this site? "NSS Replacement Procedure" and "1995 E320 neutral safety switch replacement procedure" result in no matches. Also, do you know if there is any starter information in the service manuals? I have the CD-ROM set for the 95 E320 and the paper manual set for a 1986 300E (engine, chassis (2 vols), climate control). Neither has anything on the starter. I'm hoping for some diagnostic information but so far no go. Thanks Ken
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#7 (permalink) Old 06-23-2010, 04:25 PM
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Did you replace the NSS with a MB OE part or did you use the much cheaper FEBI brand switch?

The FEBI switch has a high failure rate right out of the box.......

J. M. van Swaay
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