BMW 335D Tech help please

[911gary]

Sorry posted this on M forum too,I have a 2009 335d MSport E92 as my daily car,we have had a remap up to approx 370bhp with no other mods I had this same map on a similar car last year and the car exhibited the same issue,after driving on fast roads in Europe at high speed for prolonged periods both cars went flat throttle response fell away to about 25% almost like in limp mode,this seems worse after using paddle shift or lots of kickdown and prolonged hard acceleration,no dash warning lights,we scanned car and found all six glow plugs showing as faulty but car starts from cold and runs perfectly if you stop car and leave for 15mins all is fine any help would be appreciated...could it be the map or gearbox temp? Thank you.G

[rayyan171]

911gary said:

Sorry posted this on M forum too,I have a 2009 335d MSport E92 as my daily car,we have had a remap up to approx 370bhp with no other mods I had this same map on a similar car last year and the car exhibited the same issue,after driving on fast roads in Europe at high speed for prolonged periods both cars went flat throttle response fell away to about 25% almost like in limp mode,this seems worse after using paddle shift or lots of kickdown and prolonged hard acceleration,no dash warning lights,we scanned car and found all six glow plugs showing as faulty but car starts from cold and runs perfectly if you stop car and leave for 15mins all is fine any help would be appreciated...could it be the map or gearbox temp? Thank you.G

What lights come up as soon as the car enters limp mode? If paddle shifting and lots of kick down are causing it, it may well be gearbox issues e.g. excessive heat, torque converter, gearbox oil, gears itself? Did the map also map the gearbox software? If not then maybe the gearbox is running it's parameters on the basis of the car's standard 286hp and 430ftlb of torque, so the excess torque may be causing funny behaviour with it. Thats something to look at. Check gearbox temps during hard acceleration. Also, check the turbo's as well.