On Wed, 03 Mar 2010 14:53:37 -0600, Jim Yanik
wrote:

(Doug Miller) wrote in
:

In article ,
AZ Nomad wrote:
On Wed, 03 Mar 2010 17:26:29 GMT, Doug Miller
wrote:
In article ,
AZ Nomad
wrote:
On Wed, 03 Mar 2010 10:24:15 -0600, Douglas Johnson

wrote:
(Doug Miller) wrote:
The thing that really stood out to me was the statement by
Toyota's
president

that they're going to look into programming a brake override for
the
throttle.

I have only one question: WHY IN GOD'S NAME WAS THAT NOT THERE
FROM THE BEGINNING?

There are a very few times when you want to brake and throttle at
the same
time.
In the good old days, with drum brakes, crossing a stream, you
wanted the brakes lightly on the drums to keep them dry. This kept
them effective
after
leaving the stream. Give me some time, I probably can think of one
or two more...

But these days, given the problems, it probably makes tons of
sense. This morning, the Dallas paper said the Obama
administration is considering
mandating
it. It must make sense vbg

Not only that, but most cars have the throttle connected
mechanically to an airbox. If you cut off the fuel every time the
brakes are used, it'll wreck havock with fuel air mixture. Do you
think having valves that only last 50K miles is a worthwhile side
effect of providing a fuel cutoff for idiots who lack the driving
skills to turn the engine off?

Who said anything about cutting off the fuel? Dropping the throttle
back to idle is more than sufficient to stop runaway acceleration.


Do you think the linkage is going to be moved to idle, pedal and all?
Do you think you can move it at one end only?

Most likely the cable outer sheath at the throttle end would be moved.
Using mechanical means can cause more problems than might be solved.
If the contraption jams, you might have runaway conditions more often
than without the kluge.

Why do you think the cable needs to be moved _at all_ for the engine
computer to reduce fuel flow?


some modern engines cut off fuel flow to pairs of the cylinders,to improve
fuel economy under light load.it doesn't harm anything;the cut-off
cylinders just pump air.it doesn't even matter if the spark plug fires.

MOST variable displacement engines disable the cyl by keeping the
valves from opening as well as shutting off the fuel. Running an air
compressor takes power. Bad for economy. An engine with all the valves
closed requires very little NET energy because the copressed air stays
in the cyl and pushes the piston back down again.