PeachParts Mercedes-Benz Forum - View Single Post - has anyone ever changed a fuel frequency valve?

dpetryk · #2 12-11-2001, 12:01 AM

I know that a frequency valve is used on volvos at least early models with CIS injection system. It is a pulse width modulated valve that is used to control the air / fuel mixture and is driven by the Lambda computer. MB uses a device called EHA (electro hydraulic actuator) to do the same thing. I question if your mechanic really knows what is wrong or maybe he is trying to baffle you with bull----. You didnt say what the problem was or what type of car it is.

You tell if it is bad by checking to see if the on-off ratio is working correctly and is in closed loop mode. If it is regulating correctly everything is OK otherwise it might be defective but other things in the system can cause it run open loop.