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Author Topic: cold start & warm start  (Read 3479 times)

Sam SL

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  • Canada, British Columbia, Vancouver
  • Posts: 53
cold start & warm start
« on: May 19, 2006, 16:32:07 »
Hello;

What should I look at first to remedy the lack of idle speed at cold start?  The only way I get the revs during warmup is with my foot on the accelerator pedal.  It was never like that before.  

As for warm start, it appears I am getting an overly rich mixture even though I do not need it.  Consequently, the idle is very lumpy until I blow through the extra fuel by revving it up gently.  Sam

Sam
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Sam

'71 280 SL  -- Green Queen
82 300D
92 500E
97 SL500

ja17

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  • USA, OH, Blacklick
  • Posts: 7414
Re: cold start & warm start
« Reply #1 on: May 20, 2006, 06:14:50 »
Hello Sam,

It sounds like the "Warm Running Device" (WRD) is stuck or your injection pump or the injection pump air filter is plugged. There is a vast amount of information on this already posted. We need to know if yours is a 230SL or a latter W113. You can determine if it is working by listening for air rushing into the small injection pump air filter (see picture). Use a section of water hose as a stethoscope.  You should hear air rushing in the filter when the engine is cold. As the engine warms up the air flow will stop.

b]Download Attachment: warm up device.jpg
60.08 KB

Download Attachment:[/b] warm up device 2.jpg
9.21 KB

If your warm up device is stuck or the injection pump air filter is plugged your injection pump will not change mixture to compensate for engine temperature. The unit can easily be taken apart cleaned and re-installed, no parts or gaskets needed.

Keep us up to date.

Joe Alexander
Blacklick, Ohio

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« Last Edit: May 20, 2006, 06:17:18 by ja17 »
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Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Ben

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Re: cold start & warm start
« Reply #2 on: July 17, 2006, 10:12:32 »
Joe, I was wondering, my 280SE is still sucking air through the WRD at hot idle, there are no shims beneath it, so I assume it now needs washers stacked on top of the slider itself ?

What do these look like ?

I am familiar with my own 230SL's set up and had it starting/idling very well hot or cold but this one I havent really seen any pictures !

I have verified the thermostat works properly but it is not shutting the valve, so hot idel is still 1000RPM until I pince thge pipe then its fine !

Anyone any photos/drawings ?

Regards,
Ben in Ireland.
'64 230SL 4sp.
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Ben

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Re: cold start & warm start
« Reply #3 on: July 18, 2006, 05:05:34 »
I actually took another look at it last night and I think the rubber pipe from the air valve that connects to the metal pipe up to the CSV was drawing in air.

I havent had a chance to drive it yet but I would still like to see these washers ???

Regards,
Ben in Ireland.
'64 230SL 4sp.
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