XJ XJ8 / XJR ( X308 ) 1997 - 2003

Curious about what FI does when coasting/slowing

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Old 07-19-2013, 09:29 AM
slmskrs's Avatar
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Default Curious about what FI does when coasting/slowing

So, I'm one that likes to shift (haven't had a manual in 10 years and I miss it), so I'm constantly shifting. When I'm coasting, a lot of the time I pop it into neutral to coast farther. A friend of mine (that doesn't know anything about Jags) says that when you lift off the throttle and the momentum of the car is moving you forward, the fuel injectors turn off, thus saving you fuel when slowing down. Is this true and does our Jags do that? Makes sense, but I've never heard anything about that before.
 
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Old 07-19-2013, 09:30 AM
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Guys, sorry. Wrong forum ('05). But if anyone has an answer, please let me know.

Thanks.
 
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Old 07-19-2013, 09:42 AM
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Constant shifting to a "N" position may harm your gearbox.
Fuel cuts off for a few moments during deceleration, even on an auto gearboxes. On a manual transmissions fuel cuts off until the RPM falls to 1200-1500.
 
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