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#1
01-08-2015, 06:12 PM
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W126 300sdl idle going up and down.Need some advice..
What seems to be the problem on the 300sdl idle going up & down. Idle stays at around 1000-1200 rpm. Bought it from our neighbour not really sure what he has done on it..
linked a video https://www.youtube.com/watch?v=FQ5jWNszAPo
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'76 300D '82 230CE '84 300DT '91 300D 2.5 '86 300D 5 speed '86 250D 5 speed '90 300E 24v '88 560SEC 300TE euro 5 speed 91 350SD http://i75.photobucket.com/albums/i3...d6605222-1.jpg Last edited by euroamg; 01-09-2015 at 04:01 AM. 
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#2
01-08-2015, 07:09 PM
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Unplug the electronic idle control at the end of the injection pump to test its function. Engine should go to a stable low idle. Fuel line air leak or clogged filter(s) can also be the cause.
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 Present 1987 300SDL 1991 300SL 1990 560SEL 2001 ML320 Past 1969 200D 1979-82 1983 300SD 1984-85 1972 250C 1982-02 1995 S350 2011 1997 S320 2012
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#3
01-09-2015, 02:14 PM
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Quote:
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'76 300D '82 230CE '84 300DT '91 300D 2.5 '86 300D 5 speed '86 250D 5 speed '90 300E 24v '88 560SEC 300TE euro 5 speed 91 350SD http://i75.photobucket.com/albums/i3...d6605222-1.jpg
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#4
01-09-2015, 02:18 PM
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Other thing you can try is to replace the OVP relay. It is next to the Kilma relay with a red cover on top. Faulty OVP will give erratic idle.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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#5
01-10-2015, 03:07 PM
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idle going up and down.need some advice
On my 2005 cdi, a similar problem but less pronounced, was worn alternator brushes. steve
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