I'm getting the front part of my exhaust redone on my Jeep. I'm running a Lt1 out of a 94 corvette with a OBD1 f-body pcm and programing. I have 2 sensors, one on each bank. The exhaust leaks at the manifold and my O2 sensors are at not at the same distance from the stock maniflold.

My main goal is to fix the exhaust leak and reroute the down pipes.

My question is........is there a specific distance that the O2 sensors needs to be away from the either the cylinder head or the exhaust manifold?

 

No, nothing specific. The stock pipes put the sensors either in the manifold or right near it in the exhaust pipe. However, if you switch to headers, the sensors are several feet away from the exhaust ports. I haven't heard of an issue do to this distance and it shouldn't matter because of what it measures....

 

In the F-Body, the 94 and up O2 sensors are 4-wire, heated sensors. I would assume you are running heated sensors in your conversion, because you would probably have codes for the heaters if you had single-wire sensors. Being heated allows them to be located farther from the engine.

If you had a 93, with the single-wire, unheated sensors, you might run into a problem with the sensors not getting hot enough, if they are too far away from the engine. They have to reach a minimum termperature of 600*F before they start working.

 

Thanks.....Just wanted to make sure before I had them welded in. I having an extra bung welded in for a wideband. I was told the widebands have a recomended location, but didn't know about the O2's.

 

Wideband O2 sensors are heated and temperature calibrated. They are usually not very sensitive to location/temperature.