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pete c · 04-09-2014, 08:44 AM

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?

04-09-2014, 08:44 AM	#1 (permalink)
pete c Master EcoModder Join Date: Oct 2011 Location: ellington, ct Posts: 829 Thanks: 44 Thanked 104 Times in 80 Posts	Does DFCO truely cut off the fuel? 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?