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Old 05-24-2004, 09:39 AM
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Join Date: Mar 2004
Posts: 78
playing with W201 fuel mixture

Hello all.
I have tried to enrich the mixture of my 190E 2.3, 1992, turning the 3mm hex screw 1.5turns clockwise. The car runs a bit more, but has a strong gasoine smell, and also the idle is very unstable. This was only a test and this afternoon I am going to return it to its original position. Can a relatively short trip (I have run about 100Km) damage the cat or something? is it possible that I have noticed any difference when the KE system is supposed to compensate the mixture so it remains always the same?
I know that before, it was just right, is 1.5 turns too much and has exceeded the KE capabilities to maintain closed loop?


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Old 05-24-2004, 11:21 AM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,159
Did you have a multimeter with a duty cycle function connected to the proper pins of the test socket? You should only adjust the mixture screw if the duty cycle is not in the proper range. My recommendation is to shoot for 45-50 percent at idle. If the engine does not cold start, cold idle, and hot idle properly at 45-50 percent duty cycle, there is something else wrong. It's not the basic mixture setting.

The proper procedure is at:


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