560 sel Stalling question - Mercedes-Benz Forum
 
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#1 (permalink) Old 04-12-2013, 04:45 PM
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Unhappy 560 sel Stalling question

I have a 1989 560sel and it started stalling. I changed the crankshaft positions sensor, the fuel pump and filter but the problem persist. Any suggestions will be appreciated. It is very embarrassing in traffic. Please, help.
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#2 (permalink) Old 04-12-2013, 05:05 PM
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Look at your tachometer. What does it idle at in park? (How many RPMs?)

And in drive with foot off accelerator?

Is the economy gauge needle all the way to the left on the white line in park and engine running?

Also good to check the battery/alternator as a basic check. What is the battery voltage with the car off?

Battery voltage with car running in park?

1989 420 SEL
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#3 (permalink) Old 04-12-2013, 05:09 PM
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Is the economy gauge needle all the way to the left on the white line in park and engine running?

That thing sure is handy.

Also, vacuum leaks.


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#4 (permalink) Old 04-12-2013, 06:09 PM
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I believe your ignition switch can do this. You might try wiggling it while the car is running to see if you can duplicate the problem.
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#5 (permalink) Old 04-13-2013, 08:14 AM
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Thanks for the information. I started the engine this morning and the economy gauge needle did not go all the way to the white line in park. It was a bit close but not exactly on it (white line) in both cases - park and drive with foot off accelerator. Any more suggestions?

Last edited by garibs; 04-13-2013 at 08:18 AM.
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#6 (permalink) Old 04-13-2013, 08:15 AM
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No. It was a bit close to the white line but not exactly on it. Waht should I do next? I appreciate your help.
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#7 (permalink) Old 04-13-2013, 08:35 AM
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Do the other things mentioned in post 2 above.

You may have a vacuum leak. Check all the vacuum lines under the hood. I've not found any problems with the small hard plastic vacuum lines. But I have with the black rubber lines. They will be hard and not making a snug connection. Or will be loose. Or have cracks in them.

You can get all sorts of sizes of vacuum lines and "T" or "Y" fittings at the auto parts store.

Especially check the vacuum line going to the EZL unit which is near the driver's side headlight. Looks like this...


1989 420 SEL
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#8 (permalink) Old 04-13-2013, 10:51 AM
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I greatly appreciate this. May the good Lord richly bless you. I will let my mechanic know since we have been doing "trial and error" since the problem started. We were even contemplating on changing the part in picture but I will let him change the vacuum lines first. Thanks again.
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#9 (permalink) Old 04-13-2013, 11:13 AM
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Thank you for the nice comments!

And only change vacuum lines which are in poor condition. Mercedes owners take pretty good care of their cars. Like on my car most of the vacuum lines had already been replaced and were in good condition. I did find a couple which needed replacing though.

I would not replace any parts unless you (or your mechanic) test them and then know they are bad. Many things can be tested to see if they are working or not.

Also a vacuum leak may or may not be the cause of the problem you are having, but best to check that out...

1989 420 SEL
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