Having some trouble with an E39 BMW 525i. Been to 2 specialists so far, guys that know their stuff and there seems to be a bit of a gremlin in this car.
Car started surging as if running out of fuel then refused to start. No ECU errors so we replaced fuel pump and filter for good measure. Got a Bosch fuel pump from Diesel Electric and a GUD inline filter with the regulator from too.
Car still would not start and after swinging for a while it would suddenly take and then you need to feed in the accelerator to get it to idle. Once is idles on its own, it can be driven but if you floor it, it spits and misfires and if you on the open road then is a lack of power. After driving it for a while, switch off and it struggles to start again and feels like fuel pressure is low.
Even disconnected the airflow meter to check and changed ECU with a running car, no luck.
Question is then...which faults would the ECU miss, mostly mechanical right? So how do I diagnose this issue now. Like I said, car has been to 2 knowledgeable BMW makkies but both struggling to diagnose.
Car started surging as if running out of fuel then refused to start. No ECU errors so we replaced fuel pump and filter for good measure. Got a Bosch fuel pump from Diesel Electric and a GUD inline filter with the regulator from too.
Car still would not start and after swinging for a while it would suddenly take and then you need to feed in the accelerator to get it to idle. Once is idles on its own, it can be driven but if you floor it, it spits and misfires and if you on the open road then is a lack of power. After driving it for a while, switch off and it struggles to start again and feels like fuel pressure is low.
Even disconnected the airflow meter to check and changed ECU with a running car, no luck.
Question is then...which faults would the ECU miss, mostly mechanical right? So how do I diagnose this issue now. Like I said, car has been to 2 knowledgeable BMW makkies but both struggling to diagnose.