Matt Ion wrote:

>
> The first guy I talked to, I explained the steps I'd been through... he said
> outright, the 86-89 generation was when Honda just started putting O2 sensors
> in, and a lot of those cars, especially the carb'd ones, simply didn't have it.
>
> So it's very possible that despite what every other source says, your '86
> Prelude may simply have just the one sensor...

You never totally know whats gonna be in a certain car.. They sometimes
change stuff mid year. A 2nd sensor should be fairly easy to spot if he
can
get under the car. Should be back of the cat.. Many/most of the 86-89
carb engines also have the O2 sensor. My 89 with a carb has one. It's
needed for the feedback carb. But like you say, it wouldn't really
surprise
me if his only had one. It could go either way.
MK

 

<nm5k@wt.net> wrote
> You never totally know whats gonna be in a certain car..

I have indeed noticed this on occasion.

> They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy
> to spot if he
> can
> get under the car. Should be back of the cat.. Many/most
> of the 86-89
> carb engines also have the O2 sensor. My 89 with a carb
> has one.

My links got all mudged. If anyone has the time, take a look
at

http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
(page 2)

and

http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD

Note the /two/ O2 sensors are /both/ in the exhaust
manifold.

Dunno why.

 

<nm5k@wt.net> wrote
> You never totally know whats gonna be in a certain car..

I have indeed noticed this on occasion.

> They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy
> to spot if he
> can
> get under the car. Should be back of the cat.. Many/most
> of the 86-89
> carb engines also have the O2 sensor. My 89 with a carb
> has one.

My links got all mudged. If anyone has the time, take a look
at

http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
(page 2)

and

http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD

Note the /two/ O2 sensors are /both/ in the exhaust
manifold.

Dunno why.

 

<nm5k@wt.net> wrote
> You never totally know whats gonna be in a certain car..

I have indeed noticed this on occasion.

> They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy
> to spot if he
> can
> get under the car. Should be back of the cat.. Many/most
> of the 86-89
> carb engines also have the O2 sensor. My 89 with a carb
> has one.

My links got all mudged. If anyone has the time, take a look
at

http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
(page 2)

and

http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD

Note the /two/ O2 sensors are /both/ in the exhaust
manifold.

Dunno why.

 

Thanks for all the excellent information (mine's a 2.0si, for
completeness). I definitely know it's not on the exhaust manifold as I
got a good look at that clambering all over the car trying to get the
last stuck bolt (gotta get that blaster stuff). As soon as I get my
hands on my ramps and creep I'll go looking underneath and see what I
can find.

Thanks,
Bill
Elle wrote:
> <nm5k@wt.net> wrote
> > You never totally know whats gonna be in a certain car..
>
> I have indeed noticed this on occasion.
>
> > They sometimes
> > change stuff mid year. A 2nd sensor should be fairly easy
> > to spot if he
> > can
> > get under the car. Should be back of the cat.. Many/most
> > of the 86-89
> > carb engines also have the O2 sensor. My 89 with a carb
> > has one.
>
> My links got all mudged. If anyone has the time, take a look
> at
>
> http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
> (page 2)
>
> and
>
> http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD
>
> Note the /two/ O2 sensors are /both/ in the exhaust
> manifold.
>
> Dunno why.

 

Thanks for all the excellent information (mine's a 2.0si, for
completeness). I definitely know it's not on the exhaust manifold as I
got a good look at that clambering all over the car trying to get the
last stuck bolt (gotta get that blaster stuff). As soon as I get my
hands on my ramps and creep I'll go looking underneath and see what I
can find.

Thanks,
Bill
Elle wrote:
> <nm5k@wt.net> wrote
> > You never totally know whats gonna be in a certain car..
>
> I have indeed noticed this on occasion.
>
> > They sometimes
> > change stuff mid year. A 2nd sensor should be fairly easy
> > to spot if he
> > can
> > get under the car. Should be back of the cat.. Many/most
> > of the 86-89
> > carb engines also have the O2 sensor. My 89 with a carb
> > has one.
>
> My links got all mudged. If anyone has the time, take a look
> at
>
> http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
> (page 2)
>
> and
>
> http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD
>
> Note the /two/ O2 sensors are /both/ in the exhaust
> manifold.
>
> Dunno why.

 

Thanks for all the excellent information (mine's a 2.0si, for
completeness). I definitely know it's not on the exhaust manifold as I
got a good look at that clambering all over the car trying to get the
last stuck bolt (gotta get that blaster stuff). As soon as I get my
hands on my ramps and creep I'll go looking underneath and see what I
can find.

Thanks,
Bill
Elle wrote:
> <nm5k@wt.net> wrote
> > You never totally know whats gonna be in a certain car..
>
> I have indeed noticed this on occasion.
>
> > They sometimes
> > change stuff mid year. A 2nd sensor should be fairly easy
> > to spot if he
> > can
> > get under the car. Should be back of the cat.. Many/most
> > of the 86-89
> > carb engines also have the O2 sensor. My 89 with a carb
> > has one.
>
> My links got all mudged. If anyone has the time, take a look
> at
>
> http://media.honda.co.uk/car/owner/m...f100/6-121.pdf
> (page 2)
>
> and
>
> http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD
>
> Note the /two/ O2 sensors are /both/ in the exhaust
> manifold.
>
> Dunno why.

 

nm5k@wt.net wrote:
> Matt Ion wrote:
>
>
>>The first guy I talked to, I explained the steps I'd been through... he said
>>outright, the 86-89 generation was when Honda just started putting O2 sensors
>>in, and a lot of those cars, especially the carb'd ones, simply didn't have it.
>>
>>So it's very possible that despite what every other source says, your '86
>>Prelude may simply have just the one sensor...
>
>
> You never totally know whats gonna be in a certain car.. They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy to spot if he
> can get under the car. Should be back of the cat.. Many/most of the
> 86-89 carb engines also have the O2 sensor. My 89 with a carb has one.
> It's needed for the feedback carb. But like you say, it wouldn't really
> surprise me if his only had one. It could go either way.

Don't even get me started on mid-model-year changes...

My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical) voltage
regulator went, I tried to find a new one... all the parts catalogs listed eiter
another mechnanical (single-solenoid) unit, or a replacement electronic unit.
Neither worked properly. An astute dealership parts clerk finally found me the
right one when I brought the old one in... where the others ran around $35, the
proper one could only be had from a dealer, for $110(!!!) Seems it was one of
those infamous mid-model-year changes that ended up in only a few of the 1980s.

I lucked out and found one at a wrecker, from a car that had been recetly
written off. Beauty part is, the regulator was practically brand-new - it had
been replaced only a few weeks before the car was killed. $25!

 

nm5k@wt.net wrote:
> Matt Ion wrote:
>
>
>>The first guy I talked to, I explained the steps I'd been through... he said
>>outright, the 86-89 generation was when Honda just started putting O2 sensors
>>in, and a lot of those cars, especially the carb'd ones, simply didn't have it.
>>
>>So it's very possible that despite what every other source says, your '86
>>Prelude may simply have just the one sensor...
>
>
> You never totally know whats gonna be in a certain car.. They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy to spot if he
> can get under the car. Should be back of the cat.. Many/most of the
> 86-89 carb engines also have the O2 sensor. My 89 with a carb has one.
> It's needed for the feedback carb. But like you say, it wouldn't really
> surprise me if his only had one. It could go either way.

Don't even get me started on mid-model-year changes...

My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical) voltage
regulator went, I tried to find a new one... all the parts catalogs listed eiter
another mechnanical (single-solenoid) unit, or a replacement electronic unit.
Neither worked properly. An astute dealership parts clerk finally found me the
right one when I brought the old one in... where the others ran around $35, the
proper one could only be had from a dealer, for $110(!!!) Seems it was one of
those infamous mid-model-year changes that ended up in only a few of the 1980s.

I lucked out and found one at a wrecker, from a car that had been recetly
written off. Beauty part is, the regulator was practically brand-new - it had
been replaced only a few weeks before the car was killed. $25!

 

nm5k@wt.net wrote:
> Matt Ion wrote:
>
>
>>The first guy I talked to, I explained the steps I'd been through... he said
>>outright, the 86-89 generation was when Honda just started putting O2 sensors
>>in, and a lot of those cars, especially the carb'd ones, simply didn't have it.
>>
>>So it's very possible that despite what every other source says, your '86
>>Prelude may simply have just the one sensor...
>
>
> You never totally know whats gonna be in a certain car.. They sometimes
> change stuff mid year. A 2nd sensor should be fairly easy to spot if he
> can get under the car. Should be back of the cat.. Many/most of the
> 86-89 carb engines also have the O2 sensor. My 89 with a carb has one.
> It's needed for the feedback carb. But like you say, it wouldn't really
> surprise me if his only had one. It could go either way.

Don't even get me started on mid-model-year changes...

My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical) voltage
regulator went, I tried to find a new one... all the parts catalogs listed eiter
another mechnanical (single-solenoid) unit, or a replacement electronic unit.
Neither worked properly. An astute dealership parts clerk finally found me the
right one when I brought the old one in... where the others ran around $35, the
proper one could only be had from a dealer, for $110(!!!) Seems it was one of
those infamous mid-model-year changes that ended up in only a few of the 1980s.

I lucked out and found one at a wrecker, from a car that had been recetly
written off. Beauty part is, the regulator was practically brand-new - it had
been replaced only a few weeks before the car was killed. $25!

 

Matt Ion <soundy@moltenimage.com> wrote in
news:f%qBg.325908$Mn5.219754@pd7tw3no:

> nm5k@wt.net wrote:
>> Matt Ion wrote:
>>
>>
>>>The first guy I talked to, I explained the steps I'd been through...
>>>he said outright, the 86-89 generation was when Honda just started
>>>putting O2 sensors in, and a lot of those cars, especially the carb'd
>>>ones, simply didn't have it.
>>>
>>>So it's very possible that despite what every other source says, your
>>>'86 Prelude may simply have just the one sensor...
>>
>>
>> You never totally know whats gonna be in a certain car.. They
>> sometimes change stuff mid year. A 2nd sensor should be fairly easy
>> to spot if he can get under the car. Should be back of the cat..
>> Many/most of the
> > 86-89 carb engines also have the O2 sensor. My 89 with a carb has
> > one. It's needed for the feedback carb. But like you say, it
> > wouldn't really
>> surprise me if his only had one. It could go either way.
>
> Don't even get me started on mid-model-year changes...
>
> My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical)
> voltage regulator went, I tried to find a new one... all the parts
> catalogs listed eiter another mechnanical (single-solenoid) unit, or a
> replacement electronic unit. Neither worked properly. An astute
> dealership parts clerk finally found me the right one when I brought
> the old one in... where the others ran around $35, the proper one
> could only be had from a dealer, for $110(!!!) Seems it was one of
> those infamous mid-model-year changes that ended up in only a few of
> the 1980s.
>
> I lucked out and found one at a wrecker, from a car that had been
> recetly written off. Beauty part is, the regulator was practically
> brand-new - it had been replaced only a few weeks before the car was
> killed. $25!

Good deal!
>
>
>

I can't think of any reason why a inline 4 cyl. motor would use a second O2
sensor,prior to OBD-II's monitoring of the catalytic.

I've heard of V-engines using them,one for each bank of cylinders.
They mount them on the exhaust manifold so they heat up quicker and have
less lag than a sensor mounted far down by the catalytic underneath the
car.That's why the Integras had double-walled A pipes,to retain exhaust
heat better for the cat and it's sensors.

--
Jim Yanik
jyanik
at
kua.net

 

Matt Ion <soundy@moltenimage.com> wrote in
news:f%qBg.325908$Mn5.219754@pd7tw3no:

> nm5k@wt.net wrote:
>> Matt Ion wrote:
>>
>>
>>>The first guy I talked to, I explained the steps I'd been through...
>>>he said outright, the 86-89 generation was when Honda just started
>>>putting O2 sensors in, and a lot of those cars, especially the carb'd
>>>ones, simply didn't have it.
>>>
>>>So it's very possible that despite what every other source says, your
>>>'86 Prelude may simply have just the one sensor...
>>
>>
>> You never totally know whats gonna be in a certain car.. They
>> sometimes change stuff mid year. A 2nd sensor should be fairly easy
>> to spot if he can get under the car. Should be back of the cat..
>> Many/most of the
> > 86-89 carb engines also have the O2 sensor. My 89 with a carb has
> > one. It's needed for the feedback carb. But like you say, it
> > wouldn't really
>> surprise me if his only had one. It could go either way.
>
> Don't even get me started on mid-model-year changes...
>
> My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical)
> voltage regulator went, I tried to find a new one... all the parts
> catalogs listed eiter another mechnanical (single-solenoid) unit, or a
> replacement electronic unit. Neither worked properly. An astute
> dealership parts clerk finally found me the right one when I brought
> the old one in... where the others ran around $35, the proper one
> could only be had from a dealer, for $110(!!!) Seems it was one of
> those infamous mid-model-year changes that ended up in only a few of
> the 1980s.
>
> I lucked out and found one at a wrecker, from a car that had been
> recetly written off. Beauty part is, the regulator was practically
> brand-new - it had been replaced only a few weeks before the car was
> killed. $25!

Good deal!
>
>
>

I can't think of any reason why a inline 4 cyl. motor would use a second O2
sensor,prior to OBD-II's monitoring of the catalytic.

I've heard of V-engines using them,one for each bank of cylinders.
They mount them on the exhaust manifold so they heat up quicker and have
less lag than a sensor mounted far down by the catalytic underneath the
car.That's why the Integras had double-walled A pipes,to retain exhaust
heat better for the cat and it's sensors.

--
Jim Yanik
jyanik
at
kua.net

 

Matt Ion <soundy@moltenimage.com> wrote in
news:f%qBg.325908$Mn5.219754@pd7tw3no:

> nm5k@wt.net wrote:
>> Matt Ion wrote:
>>
>>
>>>The first guy I talked to, I explained the steps I'd been through...
>>>he said outright, the 86-89 generation was when Honda just started
>>>putting O2 sensors in, and a lot of those cars, especially the carb'd
>>>ones, simply didn't have it.
>>>
>>>So it's very possible that despite what every other source says, your
>>>'86 Prelude may simply have just the one sensor...
>>
>>
>> You never totally know whats gonna be in a certain car.. They
>> sometimes change stuff mid year. A 2nd sensor should be fairly easy
>> to spot if he can get under the car. Should be back of the cat..
>> Many/most of the
> > 86-89 carb engines also have the O2 sensor. My 89 with a carb has
> > one. It's needed for the feedback carb. But like you say, it
> > wouldn't really
>> surprise me if his only had one. It could go either way.
>
> Don't even get me started on mid-model-year changes...
>
> My first car was a 1980 Mazda GLC. When the (dual-solenoid mechanical)
> voltage regulator went, I tried to find a new one... all the parts
> catalogs listed eiter another mechnanical (single-solenoid) unit, or a
> replacement electronic unit. Neither worked properly. An astute
> dealership parts clerk finally found me the right one when I brought
> the old one in... where the others ran around $35, the proper one
> could only be had from a dealer, for $110(!!!) Seems it was one of
> those infamous mid-model-year changes that ended up in only a few of
> the 1980s.
>
> I lucked out and found one at a wrecker, from a car that had been
> recetly written off. Beauty part is, the regulator was practically
> brand-new - it had been replaced only a few weeks before the car was
> killed. $25!

Good deal!
>
>
>

I can't think of any reason why a inline 4 cyl. motor would use a second O2
sensor,prior to OBD-II's monitoring of the catalytic.

I've heard of V-engines using them,one for each bank of cylinders.
They mount them on the exhaust manifold so they heat up quicker and have
less lag than a sensor mounted far down by the catalytic underneath the
car.That's why the Integras had double-walled A pipes,to retain exhaust
heat better for the cat and it's sensors.

--
Jim Yanik
jyanik
at
kua.net

 

"ueberbill@gmail.com" <ueberbill@gmail.com> wrote in
news:1154809023.663629.253630@75g2000cwc.googlegro ups.com:

> Love reading the ECU in these things- so easy to find and figure out.
> Anyway, after the PGM-FI light comes on my ecu tells me it's a bad
> master O2 sensor. I bought one although the Autozone fellow said two
> were recommended. I was lookin' around in my Haynes manual and can't
> find where the second one IS. Anybody know?




You don't have one. Dual O2 sensors came along about 1994-1996, with the
advent of OBD-II.

You have only one oxygen sensor, and it's probably a single-wire one at
that.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

 

"ueberbill@gmail.com" <ueberbill@gmail.com> wrote in
news:1154809023.663629.253630@75g2000cwc.googlegro ups.com:

> Love reading the ECU in these things- so easy to find and figure out.
> Anyway, after the PGM-FI light comes on my ecu tells me it's a bad
> master O2 sensor. I bought one although the Autozone fellow said two
> were recommended. I was lookin' around in my Haynes manual and can't
> find where the second one IS. Anybody know?




You don't have one. Dual O2 sensors came along about 1994-1996, with the
advent of OBD-II.

You have only one oxygen sensor, and it's probably a single-wire one at
that.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/