[pete c]

I thought it did, but, got into a debate with some guy who appeared to be quite knowledgable about the subject, that this is not the case.

This took place on a hyundai forum where I went asking about wiring a FI cutoff switch. After the obligatory scolding from the anti-hypermiling crowd, this guy said that the injectors do still fire, but the pulse is much shorter. I argued that a hyper lean condition would result and that ain't good for the engine. He said that hyper lean is not an issue at such a small load.

I can see how this might be done just to keep the cat hot.

What say you ECU gurus out there? Is DFCO truely DFCO?