BMW 318 E46 1.9 2000 - EML on, no running issues - Fixed #
Posted by Darren Cotton on March 27, 2011, 10:20 am
Year of Manufacture *: 2000 Engine Size and Code *: 1.9 ( Optional ) ECU Type: MS-42 ( Optional ) Scanner Used: Autologic ( Optional) Fault Codes: P0170 system lean
Customer reported no running issues or defects, just EML on, this has been to other garages three times and had O2 sensors fitted......
Smoked intake no leaks detected. snapping throttle felt like slight misfire and slightly flat, so Scoped MAF, TPS and both O2 sensors
At WOT fault came clear....
Old MAF signal in green peaks at around 3.6v@ WOT. O2 sensors showing lean mixture across WOT
Fitted New MAF and done same test. Massive improvement MAF peaks around 4.1v@ WOT, and O2 sensor reporting nice rich mixture across WOT.No misfiring and more responsive on snap throttle