B.M.W. 525 TDS. 1997. 2500c.c. - Hunting at idleArchived Message
Posted by STEPHEN SHANLEY on May 16, 2005, 4:39 pm
HUNTING PROBLEM WITH THIS CAR AT IDLE, NO ERRORS ON MEMORY CHIP AND THE ONLY FAULT I CAN FIND WITH LIVE DATA IS THAT THE WIPER TRAVEL SENSOR VOLTAGE IS FLUCTUATING BETWEEN 0.6V. AND 2.4V. AT A FREQUENCY OF 1 HERTZ. THE FAULT DISSAPEARS AT 1300R.P.M. INITIALY WE FOUND A DAMAGED WOODRUF KEY IN THE PUMP SO WE FITTED A NEW SPROCKET AND KEY, FAULT STILL THERE . SCOPED EVERY CHANNEL ,NOTHING OBVIOUS FOUND. TRIED DISCONNECTING SENSORS ONE AT A TIME AND RE-STARTING BUT FAULT STILL THERE. SENT E.C.U. AWAY FOR TESTING-TEST O.K. POP TESTED ALL INJECTORS AND THEY FAILED, SO ALL INJECTORS WERE SERVICED, FAULT STILL THERE. E.C.U. IS DRIVING THE FUEL QUANTITY ADJUSTER AT THE SAME RATE THE WIPER TRAVEL SENSOR IS MOVING BUT I CAN SEE NO INPUT REASON FOR THIS. PUMP HAS ALSO BEEN TESTED- NO FAULTS FOUND. ALL HELP IS APRECIATED ON THIS ONE.