BMW X5 3.0 TD - Excess smoke, code 0501 EGR negative control deviation - Fixed #Archived Message
Posted by Keith Brown on September 30, 2009, 12:16 pm
got veh in today runs perfect except for occasional black smoke from exh on slightly harder acceleration code read with sykes 0501 egr negative control deviation/air mass too high,removed egr valve all ok using myty vac.vac gauge on to supply & soleniod is working on heavy revs & overrun if not slighly too much sadly cant get duty cycle on sykes,however remove maf sensor plug & egr action stops road test with maf disconnected & car runs perfect,no maf data to compare with!pin 1 is supply ok pin 2 earth pins 3&4 sould give me maf readings can anyone give me data for these pins,if im not mistaken i think im just looking at a duff maf?. your thoughts keith ps code has not returned since i erased!