DIY_EFI Digest V5 #451

[Chad Clendening]

Yes, there was a mistake in the power connection to one of the 2 transistors in this
area and I think also to the op amp right before that.   I was under the impression
the transistors were correct, just the power was connected wrong.

The free air cal -  it is supposed to be possible, but I don't really know what a/f to
set the free air to.  I do know that the free air current is about 5-6 mA,
significantly more than anything I ever saw on the engine.  0 mA is 14.7


Chad





>
> Date: Wed, 17 Jan 2001 10:17:52 -0600
> From: Robert R Ducker <bducker at txdirect.net>
> Subject: Re: diy uego
>
>      Bruce, I hope things are going well for you.
>      Here's some more UEGO stuff. Something I forgot to mention last time,
> there's an error in the controller schematic that doesn't seem to have been
> posted before. Q1 is shown reversed emitter-collector and should be NPN
> rather than PNP. So it should be a 2N3904, used as a follower with the
> collector tied to +V. This turns the ion kill stuff into a mess otherwise.
> If this has already been posted about, my apoligies, I couldn't find it.
> I also talked about pots R1 and R2 last time, should have called them R19
> and R20.
>
> Bob D
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> ------------------------------
>
> Date: Wed, 17 Jan 2001 13:05:04 -0500
> From: BT <btisdale at cybersol.com>
> Subject: Re: diy uego
>
> Thanks very much for your comments, Bob - I'm about 1/2 way through
> construction of the thing, your findings are valuable.
>
> Anybody else building one???
>
> Bruce/Chad - you referred to 'free air calibration' - what/how is this
> done?  Thanks.
>

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