Slight corrrection on VSS
Roger Heflin
rah at horizon.hit.net
Wed Jan 6 00:06:11 GMT 1999
On Tue, 5 Jan 1999, steve ravet wrote:
>
>
>
> That's decel cutoff, isn't it? I used to own an '89 vette with the
> digital dash. One of the many things the dash would do was read out
> instantaneous mpg. I distinctly remember that if you let off the gas,
> say in second gear and around 30 mph (like slowing for a stop sign),
> about a half second after getting off the gas there would be a small
> lurch, and the mpg meter would peg at 99. When you slowed to the point
> that rpm was almost idle, like 1200 or so, there was a much more
> noticeable lurch and the mpg meter would drop to a reasonable value.
> The service manual also confirmed that the ECM would shut off fuel
> delivery under some deceleration conditions. Mine was standard, does
> the automatic bin do this? seems like an auto could stall without the
> drivetrain keeping the engine turning.
>
> --steve
I did notice there is some code in the TCC lockup routines that do
things different based on coasting above or below a certain speed.
Also torque convertors work just fine in reverse, so at higher speeds
the torque convertor will still be turning the engine just not a 1:1
speed. At lower speeds the computer may be doing something to keep it
from stalling. Mine has not dropped below idle speed while I am
coasting so it is doing someting.
Roger
93 Z28 A4
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