I know, but so what? A lean condition requires enough fuel to actually allow combustion. But as you've just said, the fuel is cut (i.e. not injected at all).**

Instead of resorting to snarky comments, why don't you just answer my question? I'd like a proper technical explanation, not an "I'm too clever to answer you" attitude.*If you're so sure I'm wrong, convince me.

You are the only person I can remember who consistently claims "fuel cut kills engines" (there may be others but I can’t remember them). What I can remember is many people (including me) stating that they've repeatedly hit fuel cut and suffered no engine damage. I'm certainly not recommending anyone does that, but I’m not scaremongering about certain engine failure either.*

I makes absolutely no sense to claim that Mazda would attempt to protect the engine from one potentially destruction situation (overboost) by using a method that supposedly causes another, especially when most other manufacturers do exactly the same thing.

 

A lean hit from a fuel cut - It's not likely, but it can happen.

When the ECU cuts fuel at high revs, there could be part of a charge still in the LIM.

 

just out of curiousity, how many people on this forum have lost their motors due to the ignition cut????? im not taking sides here and i respect the fact that most of the knowledge I know has come from REted and NZ. and ive browsed a considerable amount of threads but i havent come across one that directed there blown motor towards the stock fuel cut. -alex

 

How is that going to happen? Each shot of fuel is immediately inhaled into the engine.

Perhaps the word "cut" is confusing people. The fuel is not cut mid-way through an engine cycle or anything silly like that. If at the start of the cycle the ECU detects that boost has exeeded a certain point, it simply doesn't open the injectors for that cycle. It keeps the the injectors off until boost falls, and then at the begining of the next cycle they're fired again.