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Old 11-10-2009, 01:38 AM
Registered User
Join Date: Sep 2009
Location: south texas
Posts: 91
1987 560sl high idle fixed?

Itseems that the high idle issue was fixed (with all your help), but it stll idles a little high, like 800-900 rpm, whereas before all this at idled at about 600 rpm. I re-soldered the solder joints on the idlespeed control module, removed and cleaned the idle speed solenoid, repaired some suspect looking vaccum lines, and it went from about 2,000 rpm down to 800-900 rpm. Maybe it was originally supposed to idle at this speed to begin with? any thoughts or ideas?
also, this car has a barracuda alarm system on it (on there when I bought it), Ican't find any website for "barracuda car alarms" I wonder if they are still in existance. The date on the alarm "brain" says 1999.

Thanks again,
Dwight Daymen (ddayme)

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Old 11-10-2009, 02:50 AM
Join Date: Dec 2008
Location: San Carlos, California
Posts: 431
do you think that this would bring my idle in my 16 valve down from 2000rpms as well???

800rpms sounds about right for an idle. i know thats where my car is supposed to be.

could you send me pics of what you did please.
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

1987 300SDL, (sold) 125K, bought for 1$ "Kurt"
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Old 11-12-2009, 03:28 AM
Registered User
Join Date: Sep 2009
Location: south texas
Posts: 91
I tried to load some pictures, but was asked for a URL, wasn't given the option to load from my computer. What I did was remove the idle speed control module, located behind the glove box, and went over all the solder connections, then I removed the idle control solenoid and cleaned it out with carb. cleaner, then checked all the vaccum lines I could see (replaced a rubber connector on one), and that was about it. All these were suggestions from other members that had the same problem. There is a link titled "high idle hell" from one member that goes into detail about everything that should be checked. If you type in high idle hell in the search box, I believe you will find it.

If I ever find out how to post pictures I will do so.
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Old 11-12-2009, 07:57 AM
Cal Learner's Avatar
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Join Date: Aug 2006
Location: Marysville, CA
Posts: 781
Dwight, files (including images) can be uploaded from your computer from the "Additional Options" section below the message area, then click on the "Manage Attachments" button. Voila! You'll still be limited to some pretty small file sizes, but at least they can reside on your hard drive, instead of a website somewhere.
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't
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Old 11-15-2009, 11:08 PM
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Join Date: Sep 2009
Location: south texas
Posts: 91
Thanks for the tip, now all I have to do is take pictures! but, the high idle came back this morning (1800 rpm), and now I'm back to the same problem. The things I did lasted 3-4 days, then suddenly this morning it started. I don't know what else to do, maybe the same things again, maybe I missed a solder joint or something--arrgg!

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