14+ Bmw M40 Problems
Background. Bmw 1.8 m40 and 1.9 m43 8 valve four cylinder engine design notes, list of common problems, photos and all known versions the bmw m10 four cylinder engine had been a marvel. Bmw 316i e30, bmw 316i e36.
All m40 series engines are quite good. The actuators are known to go bad and when they do, you're lookin. It's the m in the 40i's name that counts, anyway.
However it is not a worthy successor to the m57 imo.
The actuators are known to go bad and when they do, you're lookin. If they haven't been replaced already, you'll surely need to replace many of these hoses and clamps as they start leaking. It's the m in the 40i's name that counts, anyway. M40b16 engine problems and reliability.