V12 Oxy Sensors on a 8/86 xjsc

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Nick - 27 Sep 2004 00:25 GMT

Hi, I have a Aug '86 xjsc v12. It is an Australian unleaded model. I am
just wondering if anyone has had experience with the oxy sensors on this
model?

Do they play a critical role in keeping emissions down (i.e. like on a
modern car, x300 etc) or are they just there for trimming effect?

Disconnecting them doesn't seem to have any effect at all, that's why I ask.
I am also in pursuit of the best possible fuel economy ;-)

Thanks,
Nick,
Melbourne, Australia

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Ron - 27 Sep 2004 02:56 GMT

> I ask. I am also in pursuit of the best possible fuel economy ;-)

Ah!! Remove the motor and insert an XJ40 3.6. THEN you will have economy

:-)

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Nick - 27 Sep 2004 10:44 GMT

hahaha good one.

thx.

>> I ask. I am also in pursuit of the best possible fuel economy ;-)
>
> Ah!! Remove the motor and insert an XJ40 3.6. THEN you will have economy
> :-)

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Don Young - 27 Sep 2004 03:33 GMT

I do not know specifically about your car but, in general, loss of the
oxygen sensor signal causes the fuel computer to go into a "limp home" mode
in which the fuel mixture is full rich. This will decrease fuel economy. In
fact, one of the common causes of poor fuel economy is a defective oxygen
sensor. Best fuel economy is nearly always obtained with the engine running
exactly as it left the factory. Not that the v12 was ever known for
outstanding fuel economy.
Don Young

> Hi, I have a Aug '86 xjsc v12. It is an Australian unleaded model. I am
> just wondering if anyone has had experience with the oxy sensors on this
[quoted text clipped - 9 lines]
> Nick,
> Melbourne, Australia

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WayneC - 27 Sep 2004 07:23 GMT

Those oxy sensors are used as feedback by the computer to continually
adjust the fuel injectors to get optimum air/fuel ratio into the
cylinders so as to not waste fuel (rich) or burn valves (lean); I would
NOT disconnect them.

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Nick - 27 Sep 2004 10:46 GMT

Thanks, better take them seriously then and get some new ones that actually
work.

Thanks,
Nick.

>> Hi, I have a Aug '86 xjsc v12. It is an Australian unleaded model. I am
>> just wondering if anyone has had experience with the oxy sensors on this
[quoted text clipped - 13 lines]
> so as to not waste fuel (rich) or burn valves (lean); I would NOT
> disconnect them.

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