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Car Forum / Mercedes-Benz Cars / August 20061973 mercedes 450sl
my car will run fine until its driven for about 30 minutes then it will miss very bad, it seems its getting too much fuel, because it will start to smoke black smoke, could this be the switch over valve, vacume advance or what. I welcome any suggestions. Black smoke from a gas engine is over fueling - for sure. The motor's cold start fuel enrichment is stuck ON - starts fine when cold but chokes when hot. Try disconnecting the connector going to the cold start injector (next to the idle adjustment), and see if that stops the smoking. Steve > my car will run fine until its driven for about 30 minutes then it will > miss very bad, it seems its getting too much fuel, because it will start > to smoke black smoke, could this be the switch over valve, vacume advance > or what. I welcome any suggestions. 450sl schrieb: > my car will run fine until its driven for about 30 minutes then it will > miss very bad, it seems its getting too much fuel, because it will start > to smoke black smoke, could this be the switch over valve, vacume advance > or what. I welcome any suggestions. Sounds like a hole in the vacuum diaphragm inside the cold start regulator. There is a possible direct connection between fuel pump hose and intake.  SignatureRoland Franzius does it matter that my 450 is electronic fuel injected instead of manual? Does the start valve also have a vacume diaphram in it? How hard is it to find and change? Thanks for your input. 450sl schrieb: > does it matter that my 450 is electronic fuel injected instead of manual? > Does the start valve also have a vacume diaphram in it? How hard is it to > find and change? Thanks for your input. The start valve should be sitting on top of the intake manifold. It works for some seconds only at starting. Unplug its electric connection and see the difference. Below 10C (40F) the motor will not start at all. The cold start enrichment controller is an electric and engine heated vacuum controlled valve working for some 10 minutes. It is sitting somewhere at the side of the motor block to feel its temperature. It has electric, vacuum and gas connections. (extrapolations from 110 jetronic engine) SignatureRoland Franzius |
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