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#1
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Mercedes 280 SE 1979 Hard Cold Start
Hello All, i bought w116 280 se 1979 in january since then i have been trying to fix it. the car when its hot runs perfect. but i have serious problem to start it when its cold. i have changed the fuel pump, fuel distributer, warm up regulator and it is still doing the same. anyone knows what to look for to fix. i really need you help. it starts rough, sometimes dieing a few times before it warms up. Once it is warmed up, it alledgedly runs great. And if it is warmed up, shut off for a while, and started back up, it runs ok then too. thank you
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#2
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I can't think of it's name presently but on my W111 there is a relay on the firewall that is a cold start aid, it squirts extra fuel in only on cold starts to help out.
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1962 220SE W111 Coupe, 2nd owner http://img.photobucket.com/albums/v3.../SideSmall.jpg The Coupe Group (W111/112 coupes and cabs) official website The Coupe Group on Facebook MotoArigato: Roadworthy News & Humor |
#3
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First check your thermal-time switch for correct operation. It is a sensor looking thing that screws into the block or the head and tells the brain your engine is cold. You can do this without taking it out with a voltmeter. Just find out which side is supposed to be hot when the engine is cranked and see if you have any voltage there during cold cranking.
If it is working the next step is to see if you have current getting to your cold start valve. Then test the operation of the cold start valve. Or you could just wait until it is cold, usually under 95 degrees F, unbolt your cold start valve, place it in an empty glass jar and have someone crank the engine. If it squirts fuel that system is OK. If not you have found the problem and now all you have to figure out is where the source of the problem lies. Yeah, this is risky, but it is quick. Use a big jar as fuel will be squirting out at 42 psi if everything is working. |
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