My Super is running a lot better thanks to two new front pipes, but it's still a little rough at low revs. I know it needs a new Lambda, which I hope to have sorted soon. However, the engine management light is permanently on. The fault given is a faulty earth on the EGR Valve. Now all the earths have been cleaned and checked, but it's still giving the fault.
Looking around on the web, I found this as part of an explanation of what the EGR Valve does:
Now, since exhaust gas doesn’t burn, it doesn’t exactly help with combustion. At higher RPM’s, this really isn’t noticable, but at idle, the reintroduction of exhaust gas will cause a very rough idle and can cause stalling if to much is introduced into the combustion chamber
As it's the idle and low revs I'm having a problem with, could there be something else wrong with the EGR Valve that's causing the problem, or is it a red herring?
Whether this is the problem with the idling or not, I'd like to get rid of the engine management light on the dashboard, so does anyone have any ideas as to what the problem might be?