O2 sensor location on a 4.0L Manifold?
 

I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L, the
O2 sensor is in the exhaust manifold. When I researched the exhaust
manifold for the 4.0L Head I didn't see a location for the O2 sensor.

So my question is, where is the O2 Sensor located on engines with a 4.0L
Head and Exhaust manifold?

If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will the
O2 sensor go?

tia,

bill

Re: O2 sensor location on a 4.0L Manifold?
 

There are two O2 sensors on the exhaust on a 4.0. The first one is on the
down tube after the exhaust manifold. It is easily seen when under the Jeep
behind the driver side front wheel. The second it on the cat converter.

Curt


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L, the
> O2 sensor is in the exhaust manifold. When I researched the exhaust
> manifold for the 4.0L Head I didn't see a location for the O2 sensor.
>
> So my question is, where is the O2 Sensor located on engines with a 4.0L
> Head and Exhaust manifold?
>
> If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
the
> O2 sensor go?
>
> tia,
>
> bill
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

There are two O2 sensors on the exhaust on a 4.0. The first one is on the
down tube after the exhaust manifold. It is easily seen when under the Jeep
behind the driver side front wheel. The second it on the cat converter.

Curt


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L, the
> O2 sensor is in the exhaust manifold. When I researched the exhaust
> manifold for the 4.0L Head I didn't see a location for the O2 sensor.
>
> So my question is, where is the O2 Sensor located on engines with a 4.0L
> Head and Exhaust manifold?
>
> If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
the
> O2 sensor go?
>
> tia,
>
> bill
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

There are two O2 sensors on the exhaust on a 4.0. The first one is on the
down tube after the exhaust manifold. It is easily seen when under the Jeep
behind the driver side front wheel. The second it on the cat converter.

Curt


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L, the
> O2 sensor is in the exhaust manifold. When I researched the exhaust
> manifold for the 4.0L Head I didn't see a location for the O2 sensor.
>
> So my question is, where is the O2 Sensor located on engines with a 4.0L
> Head and Exhaust manifold?
>
> If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
the
> O2 sensor go?
>
> tia,
>
> bill
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

So for me to put the 4.0L head on my jeep with EFI I would need both the
4.0L manifold plus a section of exhaust pipe for the O2 sensor.

bill

"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

So for me to put the 4.0L head on my jeep with EFI I would need both the
4.0L manifold plus a section of exhaust pipe for the O2 sensor.

bill

"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

So for me to put the 4.0L head on my jeep with EFI I would need both the
4.0L manifold plus a section of exhaust pipe for the O2 sensor.

bill

"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

Maybe the newer 4.0L (TJ) has two O2 sensors, but there is only a single O2
sensor on my 92YJ 4.0L on the exhaust pipe before the cat. None on the cat.

Terry.



"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

Maybe the newer 4.0L (TJ) has two O2 sensors, but there is only a single O2
sensor on my 92YJ 4.0L on the exhaust pipe before the cat. None on the cat.

Terry.



"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

Maybe the newer 4.0L (TJ) has two O2 sensors, but there is only a single O2
sensor on my 92YJ 4.0L on the exhaust pipe before the cat. None on the cat.

Terry.



"curt" <nospam@verizon.net> wrote in message
news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> down tube after the exhaust manifold. It is easily seen when under the
Jeep
> behind the driver side front wheel. The second it on the cat converter.
>
> Curt
>
>
> "William Oliveri" <wuji@bigvalley.net> wrote in message
> news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
the
> > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> >
> > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > Head and Exhaust manifold?
> >
> > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> the
> > O2 sensor go?
> >
> > tia,
> >
> > bill
> >
> >
>
>

Re: O2 sensor location on a 4.0L Manifold?
 

I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
way works and can dig up a link on that.

Why not just stay stock or get a header with an O2 port or just kill the
stupid computer and get a sweet 25% boost in power without touching
anything?

That Ford emissions computer is a bag of dirt when the Jeeps get older.
A manually set up machine runs way better and passes emissions.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> So for me to put the 4.0L head on my jeep with EFI I would need both the
> 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
>
> bill
>
> "curt" <nospam@verizon.net> wrote in message
> news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> > down tube after the exhaust manifold. It is easily seen when under the
> Jeep
> > behind the driver side front wheel. The second it on the cat converter.
> >
> > Curt
> >
> >
> > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
> the
> > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> > >
> > > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > > Head and Exhaust manifold?
> > >
> > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> > the
> > > O2 sensor go?
> > >
> > > tia,
> > >
> > > bill
> > >
> > >
> >
> >

Re: O2 sensor location on a 4.0L Manifold?
 

I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
way works and can dig up a link on that.

Why not just stay stock or get a header with an O2 port or just kill the
stupid computer and get a sweet 25% boost in power without touching
anything?

That Ford emissions computer is a bag of dirt when the Jeeps get older.
A manually set up machine runs way better and passes emissions.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> So for me to put the 4.0L head on my jeep with EFI I would need both the
> 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
>
> bill
>
> "curt" <nospam@verizon.net> wrote in message
> news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> > down tube after the exhaust manifold. It is easily seen when under the
> Jeep
> > behind the driver side front wheel. The second it on the cat converter.
> >
> > Curt
> >
> >
> > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
> the
> > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> > >
> > > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > > Head and Exhaust manifold?
> > >
> > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> > the
> > > O2 sensor go?
> > >
> > > tia,
> > >
> > > bill
> > >
> > >
> >
> >

Re: O2 sensor location on a 4.0L Manifold?
 

I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
way works and can dig up a link on that.

Why not just stay stock or get a header with an O2 port or just kill the
stupid computer and get a sweet 25% boost in power without touching
anything?

That Ford emissions computer is a bag of dirt when the Jeeps get older.
A manually set up machine runs way better and passes emissions.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

William Oliveri wrote:
>
> So for me to put the 4.0L head on my jeep with EFI I would need both the
> 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
>
> bill
>
> "curt" <nospam@verizon.net> wrote in message
> news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > There are two O2 sensors on the exhaust on a 4.0. The first one is on the
> > down tube after the exhaust manifold. It is easily seen when under the
> Jeep
> > behind the driver side front wheel. The second it on the cat converter.
> >
> > Curt
> >
> >
> > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > I'm researching putting the 4.0L head on my 4.2L engine. On the 4.2L,
> the
> > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > manifold for the 4.0L Head I didn't see a location for the O2 sensor.
> > >
> > > So my question is, where is the O2 Sensor located on engines with a 4.0L
> > > Head and Exhaust manifold?
> > >
> > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where will
> > the
> > > O2 sensor go?
> > >
> > > tia,
> > >
> > > bill
> > >
> > >
> >
> >

Re: O2 sensor location on a 4.0L Manifold?
 

This is a Mopar MPI Mike, not the old computer you're talking about.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F81F0A4.449071B5@sympatico.ca...
> I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
> way works and can dig up a link on that.
>
> Why not just stay stock or get a header with an O2 port or just kill the
> stupid computer and get a sweet 25% boost in power without touching
> anything?
>
> That Ford emissions computer is a bag of dirt when the Jeeps get older.
> A manually set up machine runs way better and passes emissions.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> William Oliveri wrote:
> >
> > So for me to put the 4.0L head on my jeep with EFI I would need both the
> > 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
> >
> > bill
> >
> > "curt" <nospam@verizon.net> wrote in message
> > news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > > There are two O2 sensors on the exhaust on a 4.0. The first one is on
the
> > > down tube after the exhaust manifold. It is easily seen when under
the
> > Jeep
> > > behind the driver side front wheel. The second it on the cat
converter.
> > >
> > > Curt
> > >
> > >
> > > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > > I'm researching putting the 4.0L head on my 4.2L engine. On the
4.2L,
> > the
> > > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > > manifold for the 4.0L Head I didn't see a location for the O2
sensor.
> > > >
> > > > So my question is, where is the O2 Sensor located on engines with a
4.0L
> > > > Head and Exhaust manifold?
> > > >
> > > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where
will
> > > the
> > > > O2 sensor go?
> > > >
> > > > tia,
> > > >
> > > > bill
> > > >
> > > >
> > >
> > >

Re: O2 sensor location on a 4.0L Manifold?
 

This is a Mopar MPI Mike, not the old computer you're talking about.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F81F0A4.449071B5@sympatico.ca...
> I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
> way works and can dig up a link on that.
>
> Why not just stay stock or get a header with an O2 port or just kill the
> stupid computer and get a sweet 25% boost in power without touching
> anything?
>
> That Ford emissions computer is a bag of dirt when the Jeeps get older.
> A manually set up machine runs way better and passes emissions.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> William Oliveri wrote:
> >
> > So for me to put the 4.0L head on my jeep with EFI I would need both the
> > 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
> >
> > bill
> >
> > "curt" <nospam@verizon.net> wrote in message
> > news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > > There are two O2 sensors on the exhaust on a 4.0. The first one is on
the
> > > down tube after the exhaust manifold. It is easily seen when under
the
> > Jeep
> > > behind the driver side front wheel. The second it on the cat
converter.
> > >
> > > Curt
> > >
> > >
> > > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > > I'm researching putting the 4.0L head on my 4.2L engine. On the
4.2L,
> > the
> > > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > > manifold for the 4.0L Head I didn't see a location for the O2
sensor.
> > > >
> > > > So my question is, where is the O2 Sensor located on engines with a
4.0L
> > > > Head and Exhaust manifold?
> > > >
> > > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where
will
> > > the
> > > > O2 sensor go?
> > > >
> > > > tia,
> > > >
> > > > bill
> > > >
> > > >
> > >
> > >

Re: O2 sensor location on a 4.0L Manifold?
 

This is a Mopar MPI Mike, not the old computer you're talking about.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F81F0A4.449071B5@sympatico.ca...
> I thought the 4.2 manifolds will fit on the 4.0. I do believe the other
> way works and can dig up a link on that.
>
> Why not just stay stock or get a header with an O2 port or just kill the
> stupid computer and get a sweet 25% boost in power without touching
> anything?
>
> That Ford emissions computer is a bag of dirt when the Jeeps get older.
> A manually set up machine runs way better and passes emissions.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> William Oliveri wrote:
> >
> > So for me to put the 4.0L head on my jeep with EFI I would need both the
> > 4.0L manifold plus a section of exhaust pipe for the O2 sensor.
> >
> > bill
> >
> > "curt" <nospam@verizon.net> wrote in message
> > news:Ptigb.27662$kD3.7198@nwrdny03.gnilink.net...
> > > There are two O2 sensors on the exhaust on a 4.0. The first one is on
the
> > > down tube after the exhaust manifold. It is easily seen when under
the
> > Jeep
> > > behind the driver side front wheel. The second it on the cat
converter.
> > >
> > > Curt
> > >
> > >
> > > "William Oliveri" <wuji@bigvalley.net> wrote in message
> > > news:bls0b6$fj4j0$1@ID-193866.news.uni-berlin.de...
> > > > I'm researching putting the 4.0L head on my 4.2L engine. On the
4.2L,
> > the
> > > > O2 sensor is in the exhaust manifold. When I researched the exhaust
> > > > manifold for the 4.0L Head I didn't see a location for the O2
sensor.
> > > >
> > > > So my question is, where is the O2 Sensor located on engines with a
4.0L
> > > > Head and Exhaust manifold?
> > > >
> > > > If I put a 4.0L head and exhaust manifold on my 4.2L engine, where
will
> > > the
> > > > O2 sensor go?
> > > >
> > > > tia,
> > > >
> > > > bill
> > > >
> > > >
> > >
> > >

Re: O2 sensor location on a 4.0L Manifold?
 

Made for the 258" head so I don't see how it will fit the 4.0 litre
head. Their exhaust manifolds are the same as Mike pointed out.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> This is a Mopar MPI Mike, not the old computer you're talking about.

Re: O2 sensor location on a 4.0L Manifold?
 

Made for the 258" head so I don't see how it will fit the 4.0 litre
head. Their exhaust manifolds are the same as Mike pointed out.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> This is a Mopar MPI Mike, not the old computer you're talking about.

Re: O2 sensor location on a 4.0L Manifold?
 

Made for the 258" head so I don't see how it will fit the 4.0 litre
head. Their exhaust manifolds are the same as Mike pointed out.
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William Oliveri wrote:
>
> This is a Mopar MPI Mike, not the old computer you're talking about.