guyadawson Posted January 14, 2014 Share Posted January 14, 2014 Hi there I was pondering the removal of the unpopular EGR valve, and got to thinking about the ancilliaries. Specifically, once the EGR is blanked, and the the valve is no longer used, does anything else need the vacuum pump? On the other hand, is it possible to acheive the benefits of EGR removal by disabling the valve, either electonically or by disconnecting the vacuum line? Regards Guy Quote Link to comment Share on other sites More sharing options...
Dave W Posted January 14, 2014 Share Posted January 14, 2014 From memory, the vacuum is also used for cruise control and heater control. If you don't have ABS then it's also used for the brakes but I think by the time the 300TDi soft dash came out they were all fitted with ABS. Quote Link to comment Share on other sites More sharing options...
elbekko Posted January 14, 2014 Share Posted January 14, 2014 From memory, the vacuum is also used for cruise control and heater control. If you don't have ABS then it's also used for the brakes but I think by the time the 300TDi soft dash came out they were all fitted with ABS. Nope, mine doesn't have ABS. Can't remember it being used for heater control, that's all cable operated IIRC. Quote Link to comment Share on other sites More sharing options...
Dave W Posted January 14, 2014 Share Posted January 14, 2014 Can't remember it being used for heater control, that's all cable operated IIRC. It's used to open the air intake flap on the heater. Quote Link to comment Share on other sites More sharing options...
guyadawson Posted January 14, 2014 Author Share Posted January 14, 2014 The heater whatsit wouldn't surprise me. I once had a Volvo where the air recirulation flap was moved by vacuum. So I need to keep the pump, or give up the heater! Quote Link to comment Share on other sites More sharing options...
Snagger Posted January 14, 2014 Share Posted January 14, 2014 My 300Tdi RRC has only the EGR control unit attached to the vacuum pump - the ABS brakes are powered with an electric compressor and the heater system is all operated by cams, arms and levers, not by vacuum controls (same on 300Tdi Discoverys). Vehicles with vacuum servo assisted non-ABS brakes would have a hose connecting the vacuum pump to the servo. Quote Link to comment Share on other sites More sharing options...
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