Heated or not O2 sensor

[lpwcruzr]

I'm wondering how far down the exhaust system can my O2 sensor be before I
need to use a heated sensor. I have a 94 GM TBI 350 that I put in an older
vehicle. As I'm sure you all know, the original location was in the driver's
side exhaust manifold. I couldn't use the original manifolds.  The exhaust
shop did not listen very well when they put the bung for the O2 sensor in.
The first time they mounted it about 40" from the manifold, in the Y pipe,
where the two sides of the exhaust join together. I took it back and told
them where it was originally and to move it closer. Well it's closer, but
it's still 18" away from the manifold. Is this still too far away for the
one wire O2 sensor? The same year 4.3L V6 had a heated sensor. I believe it
was mounted in the Y pipe. Could I just use this sensor if I need a heated
one?

I am wondering if this is the source of an off idle hesitation this truck
has when it is cold sometimes. The problem seems to get better as the truck
warms up. Ideas?

Paul Washburn
lpwcruzr at netzero.net

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