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If I'm in 5th gear in my '97 Escort wagon it goes into DFCO within 1-2 seconds after releasing the throttle. If I recall correctly it stays in DFCO until the RPM's reach about 1100-1200 RPM. When I first got my Scan Gauge II it didn't show that it was going into DFCO. I calibrated something, without looking at the owners manual I don't remember what it was, but afterward it showed it was going into DFCO mode. I'd be very surprised if your truck doesn't have DFCO, I'm pretty sure even my '88 Escort has it.
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