weird limp mode? (09 e90 335i)
I have a 2009 e90 335i that randomly and inconsistently enters a sort of limp mode. However, the car doesn't actually go into limp mode (no lights on the dash, and the car can still reach highway speed). The car limits itself to 3k rpms, shifts very slowly, and won't build boost until 6th gear. While that's happening, the fan runs at full speed and won't go back down until the car is turned off.
It will do this regardless of the oil or coolant temperature, and sometimes it happens a couple of minutes after a cold start. The car is tuned with MHD and XHP. I've tried de-tuning the car, and it still happens.
The car was recently in the shop (this was happening before and after its visit to the shop), and while there I had my turbos inspected, a compression test, and an exhaust/boost leak test, which all came back with no issues. The car has no codes or shadow codes. Otherwise, the car performs and acts as expected.
I will try to get a video of this ASAP, but if anyone has any ideas, all the help will be greatly appreciated.
P.S - The car was in the shop for a valve cover replacement, replacement of the JBE due to water damage, a full cooling system overhaul (new water pump, expansion tank, and all the hoses/fittings were replaced), oil change, and new NGK spark plugs.
parts list
-index 12 injectors
-vrsf charge pipe
-50mm tial BOV
-upgraded fuel pump (idk which one previous owner had it installed at the same shop)
- vrsf 7.5in intercooler
-cold air intakes