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  #1  
Old 09-04-2009, 03:51 PM
mike905eh
 
Join Date: Jul 2009
Location: B.C. Canada eh!
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1990 350SD won't crank

Sorry if this is a NOOBY question, I did try and search!
My wifes 1990 126 350SD occationally won't turn over. Insert key ...glow light comes on for a few seconds and then turn key all the way over to the right and then nothing? It has done it a few times ? but when you repeat the starting process it starts like normal? . Is there a neutral safety switch or relay that needs to be checked and where and how? The car is awesome otherwise.

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  #2  
Old 09-04-2009, 03:55 PM
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Neutral safety switch is a possibility. The next time it does it, try shifting to Neutral if you're in Park (or vice versa). That will frequently reveal a NSS that is starting to go bad. Sometimes a good NSS won't get triggered properly if the linkages are out of adjustment, so this is something else you can check.

You could also have a bad starter or a bad ignition switch, but look at the NSS first.
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  #3  
Old 09-04-2009, 07:46 PM
mike905eh
 
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Thanks...I kinda figured. I will would try the neutral shifting ..just trying to be preventive... plus its my wife who drives it mostly...so I have to be able to diagnose over the phone. :-)
Thanks for your input and advice.
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  #4  
Old 09-04-2009, 07:59 PM
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Did the W126 wiring of that era have the same "environmental" insulation problem as the W124 did?
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Old 09-04-2009, 08:26 PM
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No
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  #6  
Old 09-19-2009, 02:10 PM
mike905eh
 
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Sorry for the delay in my reply,.......Kids back to school and the reno of the house continues...:-)
Yes it was the NSS...Thank you ...or atleast the linkage How do you check the switch or is a replacement? which would mean the linkgage need adjustment...
Now something I have noticed was when I put the car in Park the car moves if on a incline/decline , moves about 2-4 inches...? would that be combined with adjustment?
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  #7  
Old 09-19-2009, 02:13 PM
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Quote:
Originally Posted by mike905eh View Post
Sorry for the delay in my reply,.......Kids back to school and the reno of the house continues...:-)
Yes it was the NSS...Thank you ...or atleast the linkage How do you check the switch or is a replacement? which would mean the linkgage need adjustment...
Now something I have noticed was when I put the car in Park the car moves if on a incline/decline , moves about 2-4 inches...? would that be combined with adjustment?

I've never in my life (probably over 20 vehicles total experience, between friends' cars and stuff) seen an automatic transmission that didn't roll a couple inches before the park stop clicks in. That's normal as far as I know.
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  #8  
Old 09-19-2009, 04:26 PM
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The adjustment is in the rod between the bottom of the shift lever and the transmission bell crank which goes through the NSS. There is at bushing at each end of the rod. The bushings get brittle and disintegrate throwing off the alignment of shift lever and transmission. If your bushings are damaged or non-existent, fit new bushings before replacing the NSS. Don't change the length of the rod unless you mess with the transmission or shift lever.

Sixto
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  #9  
Old 09-19-2009, 05:59 PM
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If it starts in neutral, the NSS is probably fine, but the adjustment or bushings not so fine.

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