Noddle Posted November 19, 2006 Share Posted November 19, 2006 In these 2 pictures, the Red Line I believe if for Fast Idle (Cold start), The Blue is for IDLE (I think), what is the Purple for ?, can this be removed ? thanks, Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted November 19, 2006 Administrators Share Posted November 19, 2006 I like how you used colored lines on the pictures to ask your question. Very nice. The purple is the Boost Controlled Decelerating Device, (BCDD). Its function is when at higher RPMS and you drop/close the throttle, it allows air to by pass the throttle valve in an effort to keep the tail pipe emissions during decel to a minimum. How you know it is functioning is that when you do drop/close the throttle, you’ll notice the RPMs will hang for a brief second or two, or when coasting, the car wont decel as aggressively at first. If you don’t have to deal with emissions testing and you like a crisp throttle response i.e., the rpms drop rapidly when you close the throttle, then get rid of it and plug the holes. The EFI will function perfectly wit out it. Regards, Paul Quote Link to comment Share on other sites More sharing options...
Noddle Posted November 19, 2006 Author Share Posted November 19, 2006 Thank you, for your quick reply BRAAP, I thought using the coloured lines would make it easier to get across my question.. Nigel Quote Link to comment Share on other sites More sharing options...
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