92 Caravan O2 sensor

Hi there.

Two questions, I thank you for answer to both, one or the other.

1- What does 1 volt output from O2 sensor mean to computer?
Another way of asking would be: What is the optimum O2 sensor
output voltage for optimum gas mileage? About 104,000 mikes & counting.

2- Is changing MAP sensor difficult for a person with trouble shooting
& good mechanical aptitude?

I get about 10 miles/gallon! O2 sensor is about 3 years old.
MAP sensor is the original.
Transmission not smooth.
Some oil consumption.

Thanks

ma wrote:

> Hi there.
>
> Two questions, I thank you for answer to both, one or the other.
>
> 1- What does 1 volt output from O2 sensor mean to computer?
> Another way of asking would be: What is the optimum O2 sensor
> output voltage for optimum gas mileage? About 104,000 mikes & counting.

My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
the engines really aren't that different, it should work fine. However,
all it said about the O2 in regards to voltage is that a lower voltage is
a leaner mixture and a higher voltage is a richer mixture (lower lean,
raised rich)... it doesn't say what's optimal though. You don't own a
DRB-II by any chance, do you?

On to question #2:
> 2- Is changing MAP sensor difficult for a person with trouble shooting
> & good mechanical aptitude?

If you have to ask, then you haven't bothered to look for it. If you have
a 3.0L, it's easier than removing the air filter box. Seriously, it is.
Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
it's probably very similarly easy. Check the vacuum routing under the
hood -- it will not be an inch-for-inch picture, but will give you an idea
of which hose leads to the MAP sensor.


BEFORE YOU DO ANYTHING, THOUGH:
Check for fault codes. If you're getting really horrid mileage,
something's wrong, and there's a chance your SMEC knows about it. If you
don't know how to pull codes, cycle the key on-off-on-off-on within 5
seconds and watch your check-engine lamp. It will flash a number of
times, then pause, then flash a number of times again, then give a longer
pause. The first number of flashes is the first digit of the first
2-digit number, and the second number of flashes is the second digit of
the first 2-digit number.

Then again, I'm not sure this trick works on a '92, but I don't see why
not. I think it was 94 when it quit working.

Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
your plug wires, check your timing, check pretty much anything you can get
your hands on under the hood. There's a reason for the bad mileage. If
it's the O2 or MAP sensor, you'll probably have a fault code stored in the
computer for it. Otherwise, it's something there is no sensor for. Look
around.

HIH
CJ
--
THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE READING
IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU ARE NOT
READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
http://www.ibiblio.org/usenet-i/usenet-help.html

ma wrote:

> Hi there.
>
> Two questions, I thank you for answer to both, one or the other.
>
> 1- What does 1 volt output from O2 sensor mean to computer?
> Another way of asking would be: What is the optimum O2 sensor
> output voltage for optimum gas mileage? About 104,000 mikes & counting.

My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
the engines really aren't that different, it should work fine. However,
all it said about the O2 in regards to voltage is that a lower voltage is
a leaner mixture and a higher voltage is a richer mixture (lower lean,
raised rich)... it doesn't say what's optimal though. You don't own a
DRB-II by any chance, do you?

On to question #2:
> 2- Is changing MAP sensor difficult for a person with trouble shooting
> & good mechanical aptitude?

If you have to ask, then you haven't bothered to look for it. If you have
a 3.0L, it's easier than removing the air filter box. Seriously, it is.
Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
it's probably very similarly easy. Check the vacuum routing under the
hood -- it will not be an inch-for-inch picture, but will give you an idea
of which hose leads to the MAP sensor.


BEFORE YOU DO ANYTHING, THOUGH:
Check for fault codes. If you're getting really horrid mileage,
something's wrong, and there's a chance your SMEC knows about it. If you
don't know how to pull codes, cycle the key on-off-on-off-on within 5
seconds and watch your check-engine lamp. It will flash a number of
times, then pause, then flash a number of times again, then give a longer
pause. The first number of flashes is the first digit of the first
2-digit number, and the second number of flashes is the second digit of
the first 2-digit number.

Then again, I'm not sure this trick works on a '92, but I don't see why
not. I think it was 94 when it quit working.

Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
your plug wires, check your timing, check pretty much anything you can get
your hands on under the hood. There's a reason for the bad mileage. If
it's the O2 or MAP sensor, you'll probably have a fault code stored in the
computer for it. Otherwise, it's something there is no sensor for. Look
around.

HIH
CJ
--
THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE READING
IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU ARE NOT
READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
http://www.ibiblio.org/usenet-i/usenet-help.html

The key on-off-on-off-on works on a 92 caravan (have one myself). Pull
the codes and post them here, that should give us a clue for your problem.

Timo

Circuit Breaker wrote:
> ma wrote:
>
>
>>Hi there.
>>
>>Two questions, I thank you for answer to both, one or the other.
>>
>>1- What does 1 volt output from O2 sensor mean to computer?
>>Another way of asking would be: What is the optimum O2 sensor
>>output voltage for optimum gas mileage? About 104,000 mikes & counting.
>
>
> My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> the engines really aren't that different, it should work fine. However,
> all it said about the O2 in regards to voltage is that a lower voltage is
> a leaner mixture and a higher voltage is a richer mixture (lower lean,
> raised rich)... it doesn't say what's optimal though. You don't own a
> DRB-II by any chance, do you?
>
> On to question #2:
>
>>2- Is changing MAP sensor difficult for a person with trouble shooting
>>& good mechanical aptitude?
>
>
> If you have to ask, then you haven't bothered to look for it. If you have
> a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
> it's probably very similarly easy. Check the vacuum routing under the
> hood -- it will not be an inch-for-inch picture, but will give you an idea
> of which hose leads to the MAP sensor.
>
>
> BEFORE YOU DO ANYTHING, THOUGH:
> Check for fault codes. If you're getting really horrid mileage,
> something's wrong, and there's a chance your SMEC knows about it. If you
> don't know how to pull codes, cycle the key on-off-on-off-on within 5
> seconds and watch your check-engine lamp. It will flash a number of
> times, then pause, then flash a number of times again, then give a longer
> pause. The first number of flashes is the first digit of the first
> 2-digit number, and the second number of flashes is the second digit of
> the first 2-digit number.
>
> Then again, I'm not sure this trick works on a '92, but I don't see why
> not. I think it was 94 when it quit working.
>
> Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
> your plug wires, check your timing, check pretty much anything you can get
> your hands on under the hood. There's a reason for the bad mileage. If
> it's the O2 or MAP sensor, you'll probably have a fault code stored in the
> computer for it. Otherwise, it's something there is no sensor for. Look
> around.
>
> HIH
> CJ

The key on-off-on-off-on works on a 92 caravan (have one myself). Pull
the codes and post them here, that should give us a clue for your problem.

Timo

Circuit Breaker wrote:
> ma wrote:
>
>
>>Hi there.
>>
>>Two questions, I thank you for answer to both, one or the other.
>>
>>1- What does 1 volt output from O2 sensor mean to computer?
>>Another way of asking would be: What is the optimum O2 sensor
>>output voltage for optimum gas mileage? About 104,000 mikes & counting.
>
>
> My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> the engines really aren't that different, it should work fine. However,
> all it said about the O2 in regards to voltage is that a lower voltage is
> a leaner mixture and a higher voltage is a richer mixture (lower lean,
> raised rich)... it doesn't say what's optimal though. You don't own a
> DRB-II by any chance, do you?
>
> On to question #2:
>
>>2- Is changing MAP sensor difficult for a person with trouble shooting
>>& good mechanical aptitude?
>
>
> If you have to ask, then you haven't bothered to look for it. If you have
> a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
> it's probably very similarly easy. Check the vacuum routing under the
> hood -- it will not be an inch-for-inch picture, but will give you an idea
> of which hose leads to the MAP sensor.
>
>
> BEFORE YOU DO ANYTHING, THOUGH:
> Check for fault codes. If you're getting really horrid mileage,
> something's wrong, and there's a chance your SMEC knows about it. If you
> don't know how to pull codes, cycle the key on-off-on-off-on within 5
> seconds and watch your check-engine lamp. It will flash a number of
> times, then pause, then flash a number of times again, then give a longer
> pause. The first number of flashes is the first digit of the first
> 2-digit number, and the second number of flashes is the second digit of
> the first 2-digit number.
>
> Then again, I'm not sure this trick works on a '92, but I don't see why
> not. I think it was 94 when it quit working.
>
> Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
> your plug wires, check your timing, check pretty much anything you can get
> your hands on under the hood. There's a reason for the bad mileage. If
> it's the O2 or MAP sensor, you'll probably have a fault code stored in the
> computer for it. Otherwise, it's something there is no sensor for. Look
> around.
>
> HIH
> CJ

Thanks everyone for replying.
I know how to do "ignition key code", but mine doesn't work
(just take my word for it).
I am going to check the map sensor (now that I know it is easy),
and fake a one volt output from the O2 sensor for a while.
If the two above improve gas mileage, then I'll change O2 sensor.
And, of course, I'll do a few tune-up stuff, and live with the results.
After all, this baby is going to celebrate her 12th birthday in Aug.
In car age, that is like 92 for me?

Mike


"Circuit Breaker" > wrote in message
news
> ma wrote:
>
> > Hi there.
> >
> > Two questions, I thank you for answer to both, one or the other.
> >
> > 1- What does 1 volt output from O2 sensor mean to computer?
> > Another way of asking would be: What is the optimum O2 sensor
> > output voltage for optimum gas mileage? About 104,000 mikes & counting.
>
> My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> the engines really aren't that different, it should work fine. However,
> all it said about the O2 in regards to voltage is that a lower voltage is
> a leaner mixture and a higher voltage is a richer mixture (lower lean,
> raised rich)... it doesn't say what's optimal though. You don't own a
> DRB-II by any chance, do you?
>
> On to question #2:
> > 2- Is changing MAP sensor difficult for a person with trouble shooting
> > & good mechanical aptitude?
>
> If you have to ask, then you haven't bothered to look for it. If you have
> a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
> it's probably very similarly easy. Check the vacuum routing under the
> hood -- it will not be an inch-for-inch picture, but will give you an idea
> of which hose leads to the MAP sensor.
>
>
> BEFORE YOU DO ANYTHING, THOUGH:
> Check for fault codes. If you're getting really horrid mileage,
> something's wrong, and there's a chance your SMEC knows about it. If you
> don't know how to pull codes, cycle the key on-off-on-off-on within 5
> seconds and watch your check-engine lamp. It will flash a number of
> times, then pause, then flash a number of times again, then give a longer
> pause. The first number of flashes is the first digit of the first
> 2-digit number, and the second number of flashes is the second digit of
> the first 2-digit number.
>
> Then again, I'm not sure this trick works on a '92, but I don't see why
> not. I think it was 94 when it quit working.
>
> Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
> your plug wires, check your timing, check pretty much anything you can get
> your hands on under the hood. There's a reason for the bad mileage. If
> it's the O2 or MAP sensor, you'll probably have a fault code stored in the
> computer for it. Otherwise, it's something there is no sensor for. Look
> around.
>
> HIH
> CJ
> --
> THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE
READING
> IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU ARE
NOT
> READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
> http://www.ibiblio.org/usenet-i/usenet-help.html
>

Thanks everyone for replying.
I know how to do "ignition key code", but mine doesn't work
(just take my word for it).
I am going to check the map sensor (now that I know it is easy),
and fake a one volt output from the O2 sensor for a while.
If the two above improve gas mileage, then I'll change O2 sensor.
And, of course, I'll do a few tune-up stuff, and live with the results.
After all, this baby is going to celebrate her 12th birthday in Aug.
In car age, that is like 92 for me?

Mike


"Circuit Breaker" > wrote in message
news
> ma wrote:
>
> > Hi there.
> >
> > Two questions, I thank you for answer to both, one or the other.
> >
> > 1- What does 1 volt output from O2 sensor mean to computer?
> > Another way of asking would be: What is the optimum O2 sensor
> > output voltage for optimum gas mileage? About 104,000 mikes & counting.
>
> My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> the engines really aren't that different, it should work fine. However,
> all it said about the O2 in regards to voltage is that a lower voltage is
> a leaner mixture and a higher voltage is a richer mixture (lower lean,
> raised rich)... it doesn't say what's optimal though. You don't own a
> DRB-II by any chance, do you?
>
> On to question #2:
> > 2- Is changing MAP sensor difficult for a person with trouble shooting
> > & good mechanical aptitude?
>
> If you have to ask, then you haven't bothered to look for it. If you have
> a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> Two screws, a vacuum tube, and a 3-prong elect. connector. On other cars,
> it's probably very similarly easy. Check the vacuum routing under the
> hood -- it will not be an inch-for-inch picture, but will give you an idea
> of which hose leads to the MAP sensor.
>
>
> BEFORE YOU DO ANYTHING, THOUGH:
> Check for fault codes. If you're getting really horrid mileage,
> something's wrong, and there's a chance your SMEC knows about it. If you
> don't know how to pull codes, cycle the key on-off-on-off-on within 5
> seconds and watch your check-engine lamp. It will flash a number of
> times, then pause, then flash a number of times again, then give a longer
> pause. The first number of flashes is the first digit of the first
> 2-digit number, and the second number of flashes is the second digit of
> the first 2-digit number.
>
> Then again, I'm not sure this trick works on a '92, but I don't see why
> not. I think it was 94 when it quit working.
>
> Finally, do a tuneup. Check your idle RPM, check your spark plugs, check
> your plug wires, check your timing, check pretty much anything you can get
> your hands on under the hood. There's a reason for the bad mileage. If
> it's the O2 or MAP sensor, you'll probably have a fault code stored in the
> computer for it. Otherwise, it's something there is no sensor for. Look
> around.
>
> HIH
> CJ
> --
> THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE
READING
> IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU ARE
NOT
> READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
> http://www.ibiblio.org/usenet-i/usenet-help.html
>

How many miles on your 92? Mine just rolled over 173k...bought it at 84k
almost 7 years ago... Let me know how things turn out, my gas mileage ain't
what it used to be and haven't been able to nail it down (though not as bad
as you describe). Put in a new O2 sensor, but no MAP sensor yet...I got
tired of spending money trying to save a little bit... :-)

Wesley


"ma" > wrote in message
...
> Thanks everyone for replying.
> I know how to do "ignition key code", but mine doesn't work
> (just take my word for it).
> I am going to check the map sensor (now that I know it is easy),
> and fake a one volt output from the O2 sensor for a while.
> If the two above improve gas mileage, then I'll change O2 sensor.
> And, of course, I'll do a few tune-up stuff, and live with the results.
> After all, this baby is going to celebrate her 12th birthday in Aug.
> In car age, that is like 92 for me?
>
> Mike
>
>
> "Circuit Breaker" > wrote in message
> news
> > ma wrote:
> >
> > > Hi there.
> > >
> > > Two questions, I thank you for answer to both, one or the other.
> > >
> > > 1- What does 1 volt output from O2 sensor mean to computer?
> > > Another way of asking would be: What is the optimum O2 sensor
> > > output voltage for optimum gas mileage? About 104,000 mikes &
counting.
> >
> > My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> > the engines really aren't that different, it should work fine. However,
> > all it said about the O2 in regards to voltage is that a lower voltage
is
> > a leaner mixture and a higher voltage is a richer mixture (lower lean,
> > raised rich)... it doesn't say what's optimal though. You don't own a
> > DRB-II by any chance, do you?
> >
> > On to question #2:
> > > 2- Is changing MAP sensor difficult for a person with trouble shooting
> > > & good mechanical aptitude?
> >
> > If you have to ask, then you haven't bothered to look for it. If you
have
> > a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> > Two screws, a vacuum tube, and a 3-prong elect. connector. On other
cars,
> > it's probably very similarly easy. Check the vacuum routing under the
> > hood -- it will not be an inch-for-inch picture, but will give you an
idea
> > of which hose leads to the MAP sensor.
> >
> >
> > BEFORE YOU DO ANYTHING, THOUGH:
> > Check for fault codes. If you're getting really horrid mileage,
> > something's wrong, and there's a chance your SMEC knows about it. If
you
> > don't know how to pull codes, cycle the key on-off-on-off-on within 5
> > seconds and watch your check-engine lamp. It will flash a number of
> > times, then pause, then flash a number of times again, then give a
longer
> > pause. The first number of flashes is the first digit of the first
> > 2-digit number, and the second number of flashes is the second digit of
> > the first 2-digit number.
> >
> > Then again, I'm not sure this trick works on a '92, but I don't see why
> > not. I think it was 94 when it quit working.
> >
> > Finally, do a tuneup. Check your idle RPM, check your spark plugs,
check
> > your plug wires, check your timing, check pretty much anything you can
get
> > your hands on under the hood. There's a reason for the bad mileage. If
> > it's the O2 or MAP sensor, you'll probably have a fault code stored in
the
> > computer for it. Otherwise, it's something there is no sensor for.
Look
> > around.
> >
> > HIH
> > CJ
> > --
> > THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE
> READING
> > IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU
ARE
> NOT
> > READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
> > http://www.ibiblio.org/usenet-i/usenet-help.html
> >
>
>

How many miles on your 92? Mine just rolled over 173k...bought it at 84k
almost 7 years ago... Let me know how things turn out, my gas mileage ain't
what it used to be and haven't been able to nail it down (though not as bad
as you describe). Put in a new O2 sensor, but no MAP sensor yet...I got
tired of spending money trying to save a little bit... :-)

Wesley


"ma" > wrote in message
...
> Thanks everyone for replying.
> I know how to do "ignition key code", but mine doesn't work
> (just take my word for it).
> I am going to check the map sensor (now that I know it is easy),
> and fake a one volt output from the O2 sensor for a while.
> If the two above improve gas mileage, then I'll change O2 sensor.
> And, of course, I'll do a few tune-up stuff, and live with the results.
> After all, this baby is going to celebrate her 12th birthday in Aug.
> In car age, that is like 92 for me?
>
> Mike
>
>
> "Circuit Breaker" > wrote in message
> news
> > ma wrote:
> >
> > > Hi there.
> > >
> > > Two questions, I thank you for answer to both, one or the other.
> > >
> > > 1- What does 1 volt output from O2 sensor mean to computer?
> > > Another way of asking would be: What is the optimum O2 sensor
> > > output voltage for optimum gas mileage? About 104,000 mikes &
counting.
> >
> > My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but since
> > the engines really aren't that different, it should work fine. However,
> > all it said about the O2 in regards to voltage is that a lower voltage
is
> > a leaner mixture and a higher voltage is a richer mixture (lower lean,
> > raised rich)... it doesn't say what's optimal though. You don't own a
> > DRB-II by any chance, do you?
> >
> > On to question #2:
> > > 2- Is changing MAP sensor difficult for a person with trouble shooting
> > > & good mechanical aptitude?
> >
> > If you have to ask, then you haven't bothered to look for it. If you
have
> > a 3.0L, it's easier than removing the air filter box. Seriously, it is.
> > Two screws, a vacuum tube, and a 3-prong elect. connector. On other
cars,
> > it's probably very similarly easy. Check the vacuum routing under the
> > hood -- it will not be an inch-for-inch picture, but will give you an
idea
> > of which hose leads to the MAP sensor.
> >
> >
> > BEFORE YOU DO ANYTHING, THOUGH:
> > Check for fault codes. If you're getting really horrid mileage,
> > something's wrong, and there's a chance your SMEC knows about it. If
you
> > don't know how to pull codes, cycle the key on-off-on-off-on within 5
> > seconds and watch your check-engine lamp. It will flash a number of
> > times, then pause, then flash a number of times again, then give a
longer
> > pause. The first number of flashes is the first digit of the first
> > 2-digit number, and the second number of flashes is the second digit of
> > the first 2-digit number.
> >
> > Then again, I'm not sure this trick works on a '92, but I don't see why
> > not. I think it was 94 when it quit working.
> >
> > Finally, do a tuneup. Check your idle RPM, check your spark plugs,
check
> > your plug wires, check your timing, check pretty much anything you can
get
> > your hands on under the hood. There's a reason for the bad mileage. If
> > it's the O2 or MAP sensor, you'll probably have a fault code stored in
the
> > computer for it. Otherwise, it's something there is no sensor for.
Look
> > around.
> >
> > HIH
> > CJ
> > --
> > THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU ARE
> READING
> > IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU
ARE
> NOT
> > READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
> > http://www.ibiblio.org/usenet-i/usenet-help.html
> >
>
>

Right now it reads about 104,000, but I know it is about 1K or 2 less
than what it should be.
I have started a chart that I write down date, mileage, gallons, and $.
This, pretty soon will indicate approx. gas mileage.
If it shows really a high number, I am going to do a lot of tuning.
Whatever it takes.
Mike


"Wesley" > wrote in message
...
> How many miles on your 92? Mine just rolled over 173k...bought it at 84k
> almost 7 years ago... Let me know how things turn out, my gas mileage
ain't
> what it used to be and haven't been able to nail it down (though not as
bad
> as you describe). Put in a new O2 sensor, but no MAP sensor yet...I got
> tired of spending money trying to save a little bit... :-)
>
> Wesley
>
>
> "ma" > wrote in message
> ...
> > Thanks everyone for replying.
> > I know how to do "ignition key code", but mine doesn't work
> > (just take my word for it).
> > I am going to check the map sensor (now that I know it is easy),
> > and fake a one volt output from the O2 sensor for a while.
> > If the two above improve gas mileage, then I'll change O2 sensor.
> > And, of course, I'll do a few tune-up stuff, and live with the results.
> > After all, this baby is going to celebrate her 12th birthday in Aug.
> > In car age, that is like 92 for me?
> >
> > Mike
> >
> >
> > "Circuit Breaker" > wrote in message
> > news
> > > ma wrote:
> > >
> > > > Hi there.
> > > >
> > > > Two questions, I thank you for answer to both, one or the other.
> > > >
> > > > 1- What does 1 volt output from O2 sensor mean to computer?
> > > > Another way of asking would be: What is the optimum O2 sensor
> > > > output voltage for optimum gas mileage? About 104,000 mikes &
> counting.
> > >
> > > My book is for a 1990 "Front Wheel Drive Car", not a 1992 van, but
since
> > > the engines really aren't that different, it should work fine.
However,
> > > all it said about the O2 in regards to voltage is that a lower voltage
> is
> > > a leaner mixture and a higher voltage is a richer mixture (lower lean,
> > > raised rich)... it doesn't say what's optimal though. You don't own
a
> > > DRB-II by any chance, do you?
> > >
> > > On to question #2:
> > > > 2- Is changing MAP sensor difficult for a person with trouble
shooting
> > > > & good mechanical aptitude?
> > >
> > > If you have to ask, then you haven't bothered to look for it. If you
> have
> > > a 3.0L, it's easier than removing the air filter box. Seriously, it
is.
> > > Two screws, a vacuum tube, and a 3-prong elect. connector. On other
> cars,
> > > it's probably very similarly easy. Check the vacuum routing under the
> > > hood -- it will not be an inch-for-inch picture, but will give you an
> idea
> > > of which hose leads to the MAP sensor.
> > >
> > >
> > > BEFORE YOU DO ANYTHING, THOUGH:
> > > Check for fault codes. If you're getting really horrid mileage,
> > > something's wrong, and there's a chance your SMEC knows about it. If
> you
> > > don't know how to pull codes, cycle the key on-off-on-off-on within 5
> > > seconds and watch your check-engine lamp. It will flash a number of
> > > times, then pause, then flash a number of times again, then give a
> longer
> > > pause. The first number of flashes is the first digit of the first
> > > 2-digit number, and the second number of flashes is the second digit
of
> > > the first 2-digit number.
> > >
> > > Then again, I'm not sure this trick works on a '92, but I don't see
why
> > > not. I think it was 94 when it quit working.
> > >
> > > Finally, do a tuneup. Check your idle RPM, check your spark plugs,
> check
> > > your plug wires, check your timing, check pretty much anything you can
> get
> > > your hands on under the hood. There's a reason for the bad mileage.
If
> > > it's the O2 or MAP sensor, you'll probably have a fault code stored in
> the
> > > computer for it. Otherwise, it's something there is no sensor for.
> Look
> > > around.
> > >
> > > HIH
> > > CJ
> > > --
> > > THIS POST ORIGINATED FROM USENET, *NOT* ANY WEB-BASED FORUM! IF YOU
ARE
> > READING
> > > IT FROM A WEB BROWSER SUCH AS INTERNET EXPLORER OR NETSCAPE, THEN YOU
> ARE
> > NOT
> > > READING THE ORIGINAL POST AND YOU SHOULD LEARN ABOUT "USENET" FROM
> > > http://www.ibiblio.org/usenet-i/usenet-help.html
> > >
> >
> >
>
>
>