Tony Gordon wrote:
> I also read recently a message
> from an MG owner (sorry ...) that mentioned that if the sensor is more than
> 8-12" from the cylinder head, that a 3-wire sensor would be needed ... the
> heating effect from the burnt gases (needed to get accurate readings) might
> not be sufficient at idle. Can't confirm but sounds sort of logical.
Tony :
I don't believe this, for the simple reason that older cars with O2
sensors did not have them so close to the head, but typically 2-3 feet
downstream. The reason to either have the sensor close to the head, or
have a heater, is so that the sensor starts working quickly after the
engine is started (to meet the EPA cold start emission requirements).
As long as you are willing to wait a minute, the sensor will get hot
enough further down.
Randall
|