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From: jim beam on 14 Jun 2010 11:19
On 06/13/2010 03:12 PM, liu wrote:
>> it travels a longer distance, but only coasting in gear shuts fuel
>> delivery off - the engine computer is programmed that way. �it /has/ to
>> keep on injecting fuel while in neutral or the engine will stall. �rpm
>> is not an indicator of fuel consumption.
>
> Does this apply only to newer cars? Mine is 1994. If you have any URL
> info on this, please provide. I'd like to learn more.
> THANKS!

it applies to all electronically fuel injected cars. modern cars are
more aggressive in their cut-off strategy than older ones, for instance,
older ones cut off when the throttle is closed and rpm's are above about
1500, but modern ones look at more than engine rpm to determine whether
to inject and will cut off fuel in pretty much any over-run situation.

if you want an example, megasquirt is a d.i.y. injection system that the
consumer can program. if you want, you can dig out the computer code
and read it yourself. more accessible though is the over-run setting
which is discussed here:
http://www.msextra.com/doc/ms1extra/MS_Extra_Software_Manual.htm#ORun


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