Rover 75 2001 2.0 cdt bosch dde 4.0 - Misfires slightly at 1700 to 2000 rpm when cruisingArchived Message
Posted by Rich Finn on August 15, 2005, 8:25 pm
This Rover misfires slightly @ 1700-2000 rpm when cruising,the MAF/cam position sensor have been changed.The only code that keeps returning is 7680 CAN bus message(which a BMW tech says to ignore)Originally it stored 7680/7404 prefeed pressure monitor below working pressure/7717 sync.cam to crank signal improbable.I checked CAN high and low on a scope to verify the signals are present.Some other little things we noted are a mild reluctance to start on 4 cyls/no sign of the glow plug lamp.There are no signs of water ingress to the ECU/relay.The capacitor voltages are @ 75v when ticking over.The fuel presure is 30 mpa @ idle/121 @ full blast(which is low according to Bosch they quote 130-135mpa).The APP sensors read 99% and 89% respectively??.The fuel correction @ idle is listed below.(approx)