[Shotimes] BARO sensor

[Adam Parrott]

Good thing us ATX'ers don't have to deal with a BARO sensor.  ;)

Adam


  ----- Original Message -----
  From: Jim & Debbie Leyden
  To: 'Kevin & Cheryl Airth' ; 'Timothy Tyner' ; shotimes@autox.team.net
  Sent: Saturday, September 17, 2005 6:40 PM
  Subject: RE: [Shotimes] BARO sensor


  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



  -----Original Message-----
  From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
  On Behalf Of Kevin & Cheryl Airth
  Sent: Saturday, September 17, 2005 12:57 PM
  To: Timothy Tyner; shotimes@autox.team.net
  Subject: 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?