reaper47 0 Report post Posted December 30, 2009 (edited) What could/ would be the likely cause of a slight miss just above idol? Car is a z3 m coupe. No miss above 3000rpm. Could it be under-performing injectors? any ideas would be appreciated. Nik Edited December 30, 2009 by reaper47 Quote Share this post Link to post Share on other sites
BM WORLD 1264 Report post Posted December 30, 2009 failed ignition coil . oil down the spark plug holes . broken fan blade. get it scanned maybe Quote Share this post Link to post Share on other sites
reaper47 0 Report post Posted December 30, 2009 failed ignition coil . oil down the spark plug holes . broken fan blade. get it scanned maybe Has been scanned. nothing showing. Quote Share this post Link to post Share on other sites
BM WORLD 1264 Report post Posted December 30, 2009 Has been scanned. nothing showing. hhhmmm maybe a vaccum leak on one of the little intake hoses etc . will make it run lean at low rpm . Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted December 30, 2009 Who scanned it? and did they check live data & cylinder balance ? Alot of faults in BMW's don't throw fault codes even when there is a problem. You need to use the scan tool properly and have an understanding of the available data given to you by the tool. Quote Share this post Link to post Share on other sites
