Hi all,
How is it possible for a diesel engine (given the correct grade of fuel) to pink? Obviously with petrol, you can advance the ignition to produce the effect, but with derv, combustion is determined kind of automatically by the compression level (AFAIK) and is therefore fixed. Yet my diesel car's been pinking since the garage changed the EMU and I'm sure I'm not imagining it. How is that even possible? Any ideas?
Ta.