Quote:
Originally Posted by HighlandPete
Yes, it is as simple as that. Typically the engine will start fuelling again just a few revs above idle, to ensure smooth transition back to running state. My first petrol motor with fuel cut off on the over-run, was a 1990 vehicle.
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Spot on. Some engines also have a system where if running light loads some of the cylinders will shut off. I think one of my Jaguar V8s and a Holden with the 5.7 litre V8 both shut down one bank of 4 cylinders when just gently cruising, i.e. they weren't being fuelled until you called for more power. The Jaguar in particular (a 2003 XJ8 X350 series with the 4.2 litre motor) was remarkably economical for such a large car.