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Old 01-06-2013, 08:04 AM   #11 (permalink)
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I know, just nothing specific for the 1983 500 SL I recently picked up.
You don't need the specifics of the 500SL....just the theory. I have a 280 and have to adapt most info to my needs.

That mixture screw is the LAST thing to fiddle with.

If you have a cold start problem you should trouble shoot the cold start valve first. That valve gives a cold engine a snort of gas...............kinda like manually pumping a gas pedal on a carburated engine.
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Old 01-06-2013, 08:08 AM   #12 (permalink)
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Nobby, I'm looking at it now. When I turn the key to the "on" position, shouldn't I get voltage at the plug, like with the ICV, or is it opposite, meaning that voltage won't exsist until the car is warmed up? Just need to clarify this.
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Old 01-06-2013, 08:13 AM   #13 (permalink)
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Originally Posted by bradsscooters View Post
Nobby, I'm looking at it now. When I turn the key to the "on" position, shouldn't I get voltage at the plug, like with the ICV, or is it opposite, meaning that voltage won't exsist until the car is warmed up? Just need to clarify this.
To what? The CSV?

You would only get a quick 'flash' of voltage there...me thinks.

The best way to see is if it's working is to remove the cold start valve from the intake and put a container underneath it. Then (engine cold) turn the key and see if the valve squirts into the container.
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Old 01-06-2013, 08:22 AM   #14 (permalink)
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Okay, I will give that a try. Is there a gasket there that would need replacing?
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Old 01-06-2013, 08:34 AM   #15 (permalink)
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There is a gasket but it usually comes off clean, if not anthing in a tube. I think the CSV is a little more than a 1 time snort, maybe 10-15 secs worth of extra gas.
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Old 01-06-2013, 08:39 AM   #16 (permalink)
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There is a gasket but it usually comes off clean, if not anthing in a tube. I think the CSV is a little more than a 1 time snort, maybe 10-15 secs worth of extra gas.
Length of time depends on temperature. IIRC the thermal time switch controls this.
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Old 01-06-2013, 08:46 AM   #17 (permalink)
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I have read that the thermal time switch controls that, so I will check that now.... OT, since both of you, Rowdie and Nobby, are here, where does the power supply come from to feed the plug for the ICU? I know it's "off-topic" but I'm working on two cars at once!
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Old 01-06-2013, 09:12 AM   #18 (permalink)
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I do not know. I am terrible at reading wiring diagrams. Especially the ones in the on line or CD manual.
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