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  #1  
Old 07-11-2006, 05:47 AM
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Join Date: Jan 2004
Posts: 185
Cold Start Valve

Hi All

My 124 with 102 engine just underwent a head gasket job. Now I find that it doesn't start so readily in the mornings. I believe that my cold start valve is triggered by the coolant temp sensor (its new, single pin type). I read that the fuel pump relay triggers the valve under 35 C. Is it just between the valve and the relay or is the ECU involved? I checked the valve with a multimeter and it checks out OK. I cracked the fuel line in and there was fuel.

Can someone help me understand how this works?

Regards

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1992 124 E200 (Euro)
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  #2  
Old 07-11-2006, 06:57 AM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
I think it's controlled by the ECU.

The way to check it is to remove the valve and hook it back up, pointing it into a jar. Pull the coil wire and have someone crank the engine. At summer temps you would only see a tiny puff of fuel if you see any at all.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #3  
Old 07-13-2006, 08:58 AM
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Hi Chuck

Found out the problem. Mechanics interchanged the coolant temperature sensors for ECU and gauge. I changed both sensors for new ones but the ECU sensor was bad out of the box. The mulitmeter reading was all over the shop including being open at room temp. I replaced the old one which was OK to begin with and solved the cold start as well as wavering idle. So we can't trust all that comes out of a nice new box!

Regards
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1992 124 E200 (Euro)
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  #4  
Old 07-13-2006, 10:11 AM
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Join Date: Apr 2000
Location: Falls Church, VA
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Nice Wrench!

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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