Re: ECU Bug

["Jim Adney" <jadney@vwtype3.org>]

> Not sure about a "bug" as such, it's a documented intentional design
> feature on some of the control units that the fuel is cut while the
> RPM is high and the throttle is closed, e.g., while coasting down
> hill.  After the engine slows down to idle speed, fuel injection is
> started back up.  I think I saw it in the Bosch FI manual, but not
> sure. 

Not a bug at all, but a documented, advertised feature.

> Apparently it wasn't well received by the driving population,
> later ones didn't have it.  I have one of these controllers.  The idea
> was to save some gas.  It does kind of give the impression of an old
> lawn mower while driving in traffic and coasting to the next light.
> The odd thing is that the PN  label is a black "D" suffix one, just
> like my other one that doesn't have it.  Kind of hard to tell by
> looking then. This is on a '71 SB.  Have never had it happen while the
> gas pedal was depressed, I suppose it could happen if the accel side
> of the throttle position switch was open while the butterfly was still
> open, misadjusted or dirty, in other words.

This is what the adjustment of the throttle position switch is for.

  I got 31.5 mpg with this
> controller  between Sparks and Winemmuca, NV, with 800 lbs. of stuff,
> plus me and the cat.

That would be downhill with a tail wind.  ;-)

Jim
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Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
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