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Originally Posted by DvZ
Hello everyone. Trying to understand what the overload relay controls. My 560SL failed inspection because it was running rich. My tech told me the rich mixture is caused by a bad overload protection relay. Does anyone know how this relay causes the mixture to be off? Thanks.
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it isn't that the relay its self will cause a rich mixture, but rather if the relay is defective it may not send power to the fuel injection control module, if the module looses power there will not be any fuel control, which will likely cause a rich mixture.
a defective ov relay will also cause idle problems and abs issues.