Originally posted by volcar:
Try this, remove the vacuum line to the EGR valve & plugged the hose with a golf tee. If it's the EGR value that�s causing the problem the misfire will continue & means that the EGR valve is defective. If it continues to idle badly reconnect the vacuum line & remove the electrical connector for the EGR Vacuum Regulator (EVR) if the idle stays bad replace the EVR unit. However, if the idle get's better replace the Back Pressure Transducer (DPFE) unit. Hope it helps





I will have a look at that as well.

Here is a explanation of the EGR valve that i found some where else:
Quote:


EGR Theory. EGR serves one purpose and one purpose only. That purpose is to reduce Oxides of Nitrogen (NOx). Undernormal combustion, Nitrogen(N2)Oxygen (O2) in the air and Hydrocarbons (HC) in the fuel combind into water(H2O) Carbon dioxide (CO2) and the Nitrogen remains unchanged. Under very hot combustion temperatures, the Nitrogen reacts with the other two byproducts and forms Nitrogen oxide (NO). After being released into the atmosphere, it picks up another Oxygen and becomes Nitrogen dioxide (NO2). In the presence of sunlight,
it combines with other compounds like Hydrocarbons and forms Smog. Since exhaust gas is inert (very stable) it doesn�t burn again. So by being introduced into
the combustion chamber, it will lower combustion chamber temps enough so that
the Nitrogen doesn�t react with the other compounds and is passed unchanged out
the tailpipe thus not contributing to smog. 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



------------------------------------------------- 1996SE sports package, Duratec MTX No mods yet. 80K Kilometers. ------------------------------------------------- Wife has 1996GL Zetec ATX.