[Shotimes] BARO sensor

[Dave Kegel]

Is the BARO sensor available aftermarket?  Might be worth a quick trip to
NAPA (or wherever) for a new one, rather than throwing in another used one.

Dave

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Jim & Debbie Leyden
Sent: Saturday, September 17, 2005 6:40 PM
To: 'Kevin & Cheryl Airth'; 'Timothy Tyner'; shotimes@autox.team.net
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?
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