Problem with my WB

rr RRauscher at nni.com
Wed Jan 16 03:12:26 GMT 2002


Your free air reading is OK. No need to remove parts to check them.
Just check each part value on the parts list and check the componenet
that was placed into the board, visual/DVM.

BobR.

A79coupe at aol.com wrote:

> In a message dated Tue, 8 Jan 2002  5:44:03 PM Eastern Standard Time, rr <RRauscher at nni.com> writes:
>
> >
> > Does a free air test give an output of ~ 4.0V? If so I'd say that it
> > would seem the DIY-WB is working correctly.
>
> Free air gives an output of 4.06v.  A little on the high side.....
>
> Might want to
> > double check the component values as installed.
>
> Do you mean removing and testing the resistor values? Or is their further checking that I can do?
>
> (we have been
> > finding that free air checking typically comes in around 3.93v).
>
> When I had the car dyno'd about 3 weeks ago, their Horriba wide band (using the same bung) showed a/f in the 15:1 range at idle.  There have been no changes to the combination since that time, which leads me to think my DIY-WB readings at idle are quite suspect.
>
> Is there a practical limit on the length of the leads from the WB to the sensor.  I used 18g wire for all leads, but they are about 16 ft long in their current temporary routing.
>
> Thanks for your help
>
> Eric Anderson
> Alpharetta GA
>
> >
> > BobR.
> >
> > A79coupe at aol.com wrote:
> >
> > > I built my wide band, and finally got the bung welded in to the downtube on the headers.  To test it, I turned on the WB, waited for the led to show that the sensor was hot, and then started the engine.  The voltage from the sensor was pretty steady at about 3.12v.  According to the Vout table, this corresponds to an AF well in excess of 20:1.  Since the engine would not be running if the AF were 20:1, I know it must be wrong.  Additionally, according to some datalogging, I see that the stock o2 sensors are switching around stoich.
> > >
> > > I took the car for a brief drive, and under WOT, the WB shows 1.95-2.05v or around 12:1 AF.  This seems close compared to an AF reading I got on a chassis dyno recently.
> > >
> > > HELP!!!.  I need to know what to check in order to verify proper assembly and to trouble shoot the output.
> > >
> > > TIA
> > >
> > > Eric Anderson
> > > Atlanta, GA
> > >
> >

----- End of forwarded message from owner-diy_efi at diy-efi.org -----
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org




More information about the Diy_efi mailing list