gerrynz2002 0 Report post Posted June 1, 2007 Hi Guys - hope someone here can assist. I have an E39 540i that suddenly is starting to stall after it starts. It will run around 3-4 seconds then revs drop and it stalls. It may do this up to 3-4 times beofre it finally keeps running...this does not seem to happen often in the morning. can anyone offer some advice - is this a major issue...this cars is starting to cost alot in maintenance!! Quote Share this post Link to post Share on other sites
gmccormack 0 Report post Posted June 2, 2007 It could be a bad air flow sensor or at least a bad connection to it. I don't know if the E39 uses this particular protocol but some EFI systems allow the fuel pump to run while the starter is cranking them once the engine has started the ECU looks for a signal from the airflow meter. If after 3 seconds it doesn't get a good signal from the air flow sensor it shuts the fuel pump down again. Quote Share this post Link to post Share on other sites
