tbourner Posted December 13, 2005 Share Posted December 13, 2005 How does the EGR system work in simple terms? What would happen if the EGR valve stuck in some way? Is it linked to the EGBV and EGCV at all? Link to comment Share on other sites More sharing options...
Jake Posted December 13, 2005 Share Posted December 13, 2005 You know your car doesn't have EGR, right? Link to comment Share on other sites More sharing options...
tbourner Posted December 13, 2005 Author Share Posted December 13, 2005 What's the charcoal canister for then? Why are there so many threads about removing the EGR? OK well if not, which of the VSVs controls idle (or at least affects it)? Link to comment Share on other sites More sharing options...
tbourner Posted December 14, 2005 Author Share Posted December 14, 2005 Anyone? Can anyone tell me why I don't have EGR? I'm guessing it's a UK/US thing but I wouldn't have know that as I've never seen it written anywhere, ever. So which of the VSVs will affect the idle but not any other driving if it stuck or went wrong? Link to comment Share on other sites More sharing options...
Jake Posted December 14, 2005 Share Posted December 14, 2005 EGR is an emissions thing but, as you guessed, it's only on the UK/US spec cars. The charcoal canister is also an emissons thing but the JCars have this as well as the UK/US ones. I believe it filters petrol vapour. no idea about VSVs - sorry Link to comment Share on other sites More sharing options...
JohnA Posted December 15, 2005 Share Posted December 15, 2005 yeah, EGR is on UK/US spec. It has it's own VSV, and the effects can be non-trivial (the ECU expects it to be functional, and the fuelling/ignition maps reflect that) The carbon canister is also an emissions item, quite separate though. Link to comment Share on other sites More sharing options...
uk-rich Posted December 15, 2005 Share Posted December 15, 2005 both can be removed with no adverse affects at all Link to comment Share on other sites More sharing options...
tbourner Posted December 15, 2005 Author Share Posted December 15, 2005 OK, thanks, but that doesn't fix my problem though! Here it is: My idle drops to ~300rpm and the ECU revs it to stop it stalling (revs to ~700 every second, inlet vaccuum is 10 InHg instead of 20 InHg). Driving is almost normal, anyone who drove it might not notice - very slight misfire, pulls and boosts the same as usual. Just the idle is screwed. I want to say it's a VSV sticking as I've heard that other modern cars get similar symptoms with a faulty EGR valve. But which VSV would cause that!! Link to comment Share on other sites More sharing options...
JohnA Posted December 15, 2005 Share Posted December 15, 2005 both can be removed with no adverse affects at all I wouldn't be so quick to say that Link to comment Share on other sites More sharing options...
uk-rich Posted December 15, 2005 Share Posted December 15, 2005 are you speaking from experience ? i removed the canister to create more room for other equipment, no difference in car feel or performance removed egr when the car was made to run in ttc, again no noticable change in performance or feel Link to comment Share on other sites More sharing options...
JohnA Posted December 15, 2005 Share Posted December 15, 2005 are you speaking from experience ? yes. I, too, thought that the EGR is totally disposable, judging from all the threads on this board and Supraforums. Turns out they're all talking out of their exhaust pipes, or they are traders selling the blanking bits (fair play then) At mid-throttle the UK/US ECU runs leaner/more advanced, assuming that the EGR is operational. I even heard *knock* on mine while the EGR was disabled. Second time round the ECU had patched up the map, but I decided that there were too many 'unknown' parameters for my liking being manipulated behind my back. So I decided NOT to fit the EGR blanking plates - not with the stock ECU anyway (with something like AEM, EGR would be dead weight) The US version is a bit better, because it also has a sensor to warn about the EGR not working. The UKSpec always assumes that it is functional (bit presumptious on older cars now...) Link to comment Share on other sites More sharing options...
Digsy Posted December 15, 2005 Share Posted December 15, 2005 All that aside, I really can't see the point in taking it off. EGR doesn't operate in the high power / high rev region of the map anyway. Link to comment Share on other sites More sharing options...
JohnA Posted December 15, 2005 Share Posted December 15, 2005 yep, at full throttle the VSV disables it. You get full power. Link to comment Share on other sites More sharing options...
uk-rich Posted December 15, 2005 Share Posted December 15, 2005 i see, i have been running motec m800 for a good while now, egr was removed many moons ago, when this was fitted and mapped. that is why i never had any adverse effects ! the plates are easy to make yourself, just use the items you remove to make templates from Link to comment Share on other sites More sharing options...
JohnA Posted December 15, 2005 Share Posted December 15, 2005 yeah, with a standalone you don't want any EGR crap diluting your mixtures, do you? Dead weight, extra heat and inert garbage, and watery byproducts (poor man's Water Injection, lol...) Link to comment Share on other sites More sharing options...
tbourner Posted December 16, 2005 Author Share Posted December 16, 2005 Well there's another EGR argument, but it still doesn't really help!! Here it is: My idle drops to ~300rpm and the ECU revs it to stop it stalling (revs to ~700 every second, inlet vaccuum is 10 InHg instead of 20 InHg). Driving is almost normal, anyone who drove it might not notice - very slight misfire, pulls and boosts the same as usual. Just the idle is screwed. Anyone any ideas? Link to comment Share on other sites More sharing options...
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