BSAA65LB
Senior Member
Demineralized water is ideal for cleaning DEF components. But lacking demineralized water, hot, clean tap water is the only other choice. Never use anything other than hot water to clean DEF components.
You should even clean your tools of any traces of dirt or petroleum products before using them on DEF components. You can contaminate the system with dirty tools.
IME, the engines that met the T4i requirements seem to be a bit more delicate with emissions issues. The T4F engines seem quite a bit less fussy.
A number of T4i engines had several software patches rolled out during production to fix assorted odd issues. It amazes me how many engine people either don’t know about or don’t try a software update. If your engine is a T4i and has odd issues not explained by hardware, ask about software updates for that specific engine.
With any engine with a catalyst, don’t rule out engine health causing catalyst issues. Leaky turbo seals, rings, valve guide seal leaks, even a dirty crankcase breather put oil in the system and overwhelm the catalyst.
You should even clean your tools of any traces of dirt or petroleum products before using them on DEF components. You can contaminate the system with dirty tools.
IME, the engines that met the T4i requirements seem to be a bit more delicate with emissions issues. The T4F engines seem quite a bit less fussy.
A number of T4i engines had several software patches rolled out during production to fix assorted odd issues. It amazes me how many engine people either don’t know about or don’t try a software update. If your engine is a T4i and has odd issues not explained by hardware, ask about software updates for that specific engine.
With any engine with a catalyst, don’t rule out engine health causing catalyst issues. Leaky turbo seals, rings, valve guide seal leaks, even a dirty crankcase breather put oil in the system and overwhelm the catalyst.