EFI Questions

[ECMnut at aol.com]

Hi Dan,
 I believe most of the GM stuff shuts off the injectors for 
"coast down" conditions, but  they give a *blip* of max pulse 
width, once in a while, just to supply some fuel to keep the 
convertor lit.  
 I was recording dragstrip runs with a diacom, and could not 
figure out what was causing the injector pulse to spike from zero
 to 32ms(!) while coasting down at the end of the runs..
At 4000 rpm, that is something like 4 Revolutions of full
time injector spray.. I have a speed density 6cyl, 
where all of the injectors fire together....
I have a graph of a run at the bottom of the page, at
 http://www.enzoco.com/mike/syclone/monitor.htm
It is a tall page, so scroll downward if you are interested..
HTH
Mike V

In a message dated 1/29/99 3:20:45 AM Eastern Standard Time,
dzorde at geocities.com writes:
>  Brings me back to the original question.  Has anyone noticed on a OEM speed
>  density system what happens when you get of the accelerator.  My system
>  jumps from a high load band to a light load band (seems logical), however
as
>  this lighter load band is using a much smaller pulse width the engine
>  instantly goes very lean when entering this band from a heavy load band.
>  Does this seem right ?  What happens in a OEM system ?