Idle speed control w124 300D

petermerle · 29-12-2008, 08:51 PM

My 87 300D idle speed control stops working when under the hood temps get high. Idle then runs up to around 1700 rpm . The voltage going to the idle servo on the inj pump also then increases to 12V from the normal 2.5 - 3.5 V. Anyone got any idea what the cause of this is?
Peter

bolide · 30-12-2008, 08:14 PM

87 300D with an idle servo?

AFAIK the 93-on 606-engined cars have digitally stabilised idling but the early cars don't. AFAIK they have a cold-start enrichment system only

is this a UK car? Have you checked it against the Russian website to find out what kit it has as standard?

Nick Froome
www.w124.co.uk

petermerle · 05-01-2009, 06:06 AM

Mine definitely has idle speed control - - if you want to check its vin details it is ADB1241306A285123. For the russian site to recognise the VIn you have to replace the ADB ( Made in South Africa ) with WDB .
Peter

bolide · 05-01-2009, 09:56 AM

http://www.detali.ru/cat/oem_mb2.asp...SGR=045&SGN=01

Nick Froome
www.w124.co.uk

Dieselman · 05-01-2009, 09:59 AM

Check the OVP for dry joints first.

mattc · 05-01-2009, 10:01 AM

Quote:

Originally Posted by Dieselman

Check the OVP for dry joints first.

When you say "dry joints" do you mean inside the relay itself or at the pins/sockets? If only external what should they be sprayed with to clean?

Dieselman · 05-01-2009, 10:22 AM

I mean inside really, but no harm in using contact cleaner on the connections.

mattc · 05-01-2009, 10:23 AM

Quote:

Originally Posted by Dieselman

I mean inside really, but no harm in using contact cleaner on the connections.

So how do you check a relay internally then?

petermerle · 05-01-2009, 12:45 PM

Where do you find the OVP and the Controller ? Is it behind the battery ? Mine is RHD
Peter

SilverSaloon · 05-01-2009, 01:23 PM

Quote:

Originally Posted by petermerle

Where do you find the OVP and the Controller ? Is it behind the battery ? Mine is RHD
Peter

remove the plastic trim cover just behind the battery. It lives under there.

You'll have to put the bonnet to 90deg to access it properly.

also, more info here:

What relay is this please?

29-12-2008, 08:51 PM	#1
petermerle New Member Join Date: May 2006 Posts: 5	Idle speed control w124 300D My 87 300D idle speed control stops working when under the hood temps get high. Idle then runs up to around 1700 rpm . The voltage going to the idle servo on the inj pump also then increases to 12V from the normal 2.5 - 3.5 V. Anyone got any idea what the cause of this is? Peter

30-12-2008, 08:14 PM	#2
bolide Hardcore MB Enthusiast Join Date: Oct 2005 Location: Brighton Car: W124 E300 Diesel Multivalve Estate Posts: 1,829	87 300D with an idle servo? AFAIK the 93-on 606-engined cars have digitally stabilised idling but the early cars don't. AFAIK they have a cold-start enrichment system only is this a UK car? Have you checked it against the Russian website to find out what kit it has as standard? Nick Froome www.w124.co.uk

05-01-2009, 06:06 AM	#3
petermerle New Member Threadstarter Join Date: May 2006 Posts: 5	Mine definitely has idle speed control - - if you want to check its vin details it is ADB1241306A285123. For the russian site to recognise the VIn you have to replace the ADB ( Made in South Africa ) with WDB . Peter

05-01-2009, 09:56 AM	#4
bolide Hardcore MB Enthusiast Join Date: Oct 2005 Location: Brighton Car: W124 E300 Diesel Multivalve Estate Posts: 1,829	http://www.detali.ru/cat/oem_mb2.asp...SGR=045&SGN=01 Nick Froome www.w124.co.uk

05-01-2009, 09:59 AM	#5
Dieselman Hardcore MB Enthusiast Join Date: Jul 2003 Posts: 19,310	Check the OVP for dry joints first.

05-01-2009, 10:22 AM	#7
Dieselman Hardcore MB Enthusiast Join Date: Jul 2003 Posts: 19,310	I mean inside really, but no harm in using contact cleaner on the connections.

05-01-2009, 12:45 PM	#9
petermerle New Member Threadstarter Join Date: May 2006 Posts: 5	Where do you find the OVP and the Controller ? Is it behind the battery ? Mine is RHD Peter

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