[Shotimes] BARO sensor

[Kevin & Cheryl Airth]

Thanks Jim!
 But I forgot the part numbers.
MotorCraft #DY-530
Ford #E7FZ-12A644-A
Echlin(NAPA) #CRB219000

I don't have any current prices.

"PS: Although the Pobst book does have a way to test every sensor with an
ohm-meter."


I have the Probst book but the BP is one of the few sensors that CAN NOT be
checked with a ohm-meter unless it has a frequency counter built in. Mine
does not but maybe it more common than I thought. If anyone has an easier
way to check one, please post it to the list.
Thanks!
.
.




> NAPA (or wherever) for a new one, rather than throwing in another used
one.
>
> Dave
>

>
> Damn, Kevin!!
>
> That's a really good write up!
>
> You can also use an oscilloscope or a good quality (read that high end
> Fluke) digital multimeter to check the waveform.
>
> I know... who has one of those lying around...  But they are more readily
> available than frequency counters.
>
> Although I'm not certain (been too long since I have used one) but the
> oscilloscopes that used to be used for ignition diagnostics might be able
to
> display that high of a frequency.  Those are getting fairly cheap since
they
> are no longer useful.
>
> Jim
>
: Re: [Shotimes] BARO sensor
>
> Tim The Tool Man:
> Great screen name!
> That's a tough one to troubleshoot. It very well could be the cause of
your
> lean running but then again maybe not? The easiest way is just to swap
> sensor's. There have been several long term drivability problems that were
> finally found to be the BP sensor but no code was set. The sensor was
still
> operating in the correct range of values but was not changing at all. This
> made the car drive OK at some engine speeds and loads and to be WAY off in
> other conditions. It's mainly used as an altitude compensation device so
the
> closer to sea level you drive the less of an effect a bad BP sensor will
> have.
>
>  Do you have access to another sensor?
>
>  The sensor can be checked with a frequencies counter. Yea, I know who has
> one of these? Anyway at sea level you should be seeing around 160-170 Hz.
As
> you apply vacuum to the open port the frequency should decrease to a low
of
> somewhere around 90Hz. The sensor has 3 wires. One is the 5 VDC supply,
one
> is a ground and the middle pin on the sensor should be the changing
output.
> I do have instructions for using a tachometer to read the frequency. Set
it
> on 4 cylinder setting and you should see 4800 rpm with no vacuum and the
> rpm's should decrease with increasing vacuum. . .
>
>
>
> > What symptoms will I see (if any) of a bad BARO sensor?