[xj-s] O2 Sensor

Just some info on a couple of messages I have seen the last few days.
Someone asked if the cold air induction was noticeable. Well I just did it
about a month back and I can say without a doubt… I can’t tell. I used
the PVC conduit to make a mount on the air cleaner housing and some hose
from a kit the PO had ordered. (his kit mounted over the radiator but the
intakes were as small as the horns already on the car) I cut the head light
housings per the book. The only trouble I had was this was all at just over
2" stuff so not as big as I would like. If you do the math though that
should double my air intake area over the 1 1/2 of the original horns. I am
really pleased with the mod as I know in my heart it has done the car good
but I can’t tell a thing in the power department. I do think that the hoses
look better than the horns though.

One other thing I saw on here was someone saying you should mount the O2
sensor out on the intake line and not in the air cleaner housing. It seems
that I may have proven this although inadvertently. I drilled the
appropriate hole in the housing and put my sensor there. Though it may not
be horrible there is a small problem. I keep close watch on my gas mileage
so I know what I was getting pre mod. I noticed that after the mod I was
getting just a few tenths less. Originally I contributed this to the fact
that I was “testing” the mod, but eventually I had to admit that indeed I
was getting less gas mileage. It was, like I said, only a few tenths, no
worries, but it was there. Well last week I started getting a couple of
miles to the gallon less. I couldn’t figure it out till last night when I
noticed that while working on the car a few nights ago I had left the O2
sensor off. That O2 sensor off cost me 1 to 2 miles per gallon. The O2
sensor on the housing instead of out in the line of fresh air cost me 1 or 2
tenths of a gallon.

TWA wrote:

Just some info on a couple of messages I have seen the last few days.
Someone asked if the cold air induction was noticeable. Well I just did it
about a month back and I can say without a doubt… I can’t tell. I used
the PVC conduit to make a mount on the air cleaner housing and some hose
from a kit the PO had ordered. (his kit mounted over the radiator but the
intakes were as small as the horns already on the car) I cut the head light
housings per the book. The only trouble I had was this was all at just over
2" stuff so not as big as I would like. If you do the math though that
should double my air intake area over the 1 1/2 of the original horns. I am
really pleased with the mod as I know in my heart it has done the car good
but I can’t tell a thing in the power department. I do think that the hoses
look better than the horns though.

One other thing I saw on here was someone saying you should mount the O2
sensor out on the intake line and not in the air cleaner housing. It seems
that I may have proven this although inadvertently. I drilled the
appropriate hole in the housing and put my sensor there. Though it may not
be horrible there is a small problem. I keep close watch on my gas mileage
so I know what I was getting pre mod. I noticed that after the mod I was
getting just a few tenths less. Originally I contributed this to the fact
that I was “testing” the mod, but eventually I had to admit that indeed I
was getting less gas mileage. It was, like I said, only a few tenths, no
worries, but it was there. Well last week I started getting a couple of
miles to the gallon less. I couldn’t figure it out till last night when I
noticed that while working on the car a few nights ago I had left the O2
sensor off. That O2 sensor off cost me 1 to 2 miles per gallon. The O2
sensor on the housing instead of out in the line of fresh air cost me 1 or 2
tenths of a gallon.

This might actually be proof that the cold air intake mod worked.

If you are getting slightly more air in (whether because of lower
air temp or less restriction), the ecu will richen up the mixture
accordingly (via the O2 sensors if it’s better air flow, and by the
air temp :slight_smile: sensor if it’s cooler air).

Walter

Hi All.

A couple of weeks ago the car failed the emissions test, yet it 

ran very well and smooth, so I changed the O2 sensor, it then
passed. Now the car runs much better, I don t know if its like when
you change the oil it runs smoother, but, it sure seems to run much
better. and more performance.

Ernst.–
Ernst 92 XJS Coupe 4.0, 5 spd, and 68 420G
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

// please trim quoted text to context only

i’m replacing the O2 sensors on my 93, 4.0. everything I’ve seen
indicates two (2) sensors but darn if I can find the second. the
first is outbound, on top of the pipe. where pray tell is number
two?

BCTCBOSS
93 XJS 4.0–
BCTCBOSS
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

// please trim quoted text to context only

In reply to a message from BCTCBOSS sent Tue 1 Jul 2008:

Regarding O2 -
My 94 XJS 2+2 4l, with the same AJ6 engine, only required 1. I
used a generic Borg-Warner off ebay and have no issues or problems,
just splice in the three leads (two heater one sensor, polarity not
critical on the heater leads). Cleared the FF-44 code, the old
sensor was quite corroded. The Bosch I removed had a code 258-003-
313, SH-24 codes. Direct replacements are considerably over spec
compared to the $25 US for the generic replacement.

Bill 94 xjs, 87 xj6.–
w156
Granger, IN, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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With a 93 model, with the AJ6 engine, there is only the one O2 sensor.

Nigel
XJS 4 Litre 1993 Ragtop
Manchester
UK

-----Original Message-----
From: owner-xj-s@jag-lovers.org [mailto:owner-xj-s@jag-lovers.org]On
Behalf Of BCTCBOSS
Sent: 01 July 2008 20:42
To: xj-s@jag-lovers.org
Subject: [xj-s] O2 Sensor

i’m replacing the O2 sensors on my 93, 4.0. everything I’ve seen
indicates two (2) sensors but darn if I can find the second. the
first is outbound, on top of the pipe. where pray tell is number
two?

// please trim quoted text to context only

In reply to a message from BCTCBOSS sent Tue 1 Jul 2008:

Thanks to all, now the trick is to get it off.–
BCTCBOSS
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

// please trim quoted text to context only

Run the car to get the exhaust hot.
A 22mm socket on a long extension with universal joint allows access from
the top of the engine bay, other wise it means getting the car up on axle
stands as high as possible to work at it from below.
You can get O2 sensor sockets which have a slot cut in the side to clear the
wires, but if your ditching the existing sensor, then the wires can be cut
at the sensor.

Nigel
XJS 4 Litre 1993 Ragtop
Manchester
UK

-----Original Message-----
From: owner-xj-s@jag-lovers.org [mailto:owner-xj-s@jag-lovers.org]On
Behalf Of BCTCBOSS
Sent: 02 July 2008 12:53
To: xj-s@jag-lovers.org
Subject: Re: [xj-s] O2 Sensor

In reply to a message from BCTCBOSS sent Tue 1 Jul 2008:

Thanks to all, now the trick is to get it off.

// please trim quoted text to context only