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My Del Sol ('93 Acura engine) drops into DFCO whenever you let off the gas, in any gear, and the RPM is above 1000. It's really as simply as that. Warm or cold, 1st or 5th (or even reverse!). I believe it detects "letting off the gas" via throttle position, because I was having some trouble getting it to go in for a while and found the screws on my TPS were a bit loose. After adjusting it back to the position it was supposed to be in, and tightening it, everything again worked properly.
It seems a similar system is used in my Insight but I've only had the car a few weeks and am not 100% sure yet. I only use the onboard instrumentation, and not an MPGuino, which reads the injector grounds and tells you when they're not firing.
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