[tdangle]

Originally Posted by rpmerf

Another thing I've heard. Use pipe dope instead of teflon tape, as the tape will not allow it to conduct as well.

Manifolds or headers? Heat shields?

Does the connector fit firmly onto the sensor?

They come from AC Delco with teflon tape on the threads. If the sensor was isolated from the block you would have no reading not floating higher than it should normally read. It works as a resistance to ground. Stock exhaust manifolds, heat shields long gone, but it worked previously. No change in ground straps. Connector is firmly connected. Again if loose would read low or not at all.

Going to work on it this weekend and hopefully figure it out. Will keep you all updated.