I had a Cadi. Eldorado(4.1 V8 D.F.I.) in the other day. It was failing our (WA state) emission test @ 2500 in "N"(3-5%CO). At first I thought it was an extended idle stratagy, but read on! I can restart it(fully warmed up & had been in closed loop), bring it u... Login to read more.