A question on O2 sensor relocation
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A question on O2 sensor relocation
I've been working slowly on my 1985 5.0 EFI f150 on a number of issues lately with some success, but after repeatedly checking my KOER codes, I've decided my o2 sensor was shot, especially since it appears to be the original one.
As I needed to put another heater core in it (no a/c) and I was going to have to remove the heater box, I tought it would be a good time to tackle it, as it's located on the extreme rear of the RH manifold. I got the box off, and got the sensor out with much effort. In the process of coming out, unfortunately, it pulled the treads completely out of the hole within reach of the sensor. I understand this is a common problem, but considering the location of the hole, it's more of a problem than most I've dealt with in the past.
My question is ths: If I plug the manifold and weld in a bung just below the exhaust pipe flange (in the Y pipe) will the sensor read correctly as it would be further downstream? Or, other than a replacement manifold, is there a fix for this situation? would there be another sensor by application that would be a better choice for this relocation? Any input would be appreciated.
As I needed to put another heater core in it (no a/c) and I was going to have to remove the heater box, I tought it would be a good time to tackle it, as it's located on the extreme rear of the RH manifold. I got the box off, and got the sensor out with much effort. In the process of coming out, unfortunately, it pulled the treads completely out of the hole within reach of the sensor. I understand this is a common problem, but considering the location of the hole, it's more of a problem than most I've dealt with in the past.
My question is ths: If I plug the manifold and weld in a bung just below the exhaust pipe flange (in the Y pipe) will the sensor read correctly as it would be further downstream? Or, other than a replacement manifold, is there a fix for this situation? would there be another sensor by application that would be a better choice for this relocation? Any input would be appreciated.
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If your O2 sensor is in the exhaust manifold, that means there is another one on the other side correct? I believe the computer is programmed to "view" each side of the engine separately with each O2 sensor, so putting one down where it can see both sides might mess it up. Also, the O2 sensor has to get hot before it works correctly, so they put it as close as they dare to the hot engine so the computer can go into closed loop as soon as possible and pass emissions.
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I think you should be fine. On a newer Mustangs with EECIV the bung is in the exhaust pipe just below the manifold. For long tube headers you have to put it in the collector which is much farther away from the exhaust port.
Logistics Pro
Joined: Jan 2007
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From: Martinsburg, WV
The newer Mustangs/Fords have heated multi wire heated o2s. The 1 wire non heated units need to be as close to the manifold as possible. You can go to a later model 3 wire unit if you wire in a suitable KOER power source for the heater. one wire is for sense, the other two are for heat(+/-).
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If your O2 sensor is in the exhaust manifold, that means there is another one on the other side correct? I believe the computer is programmed to "view" each side of the engine separately with each O2 sensor, so putting one down where it can see both sides might mess it up. Also, the O2 sensor has to get hot before it works correctly, so they put it as close as they dare to the hot engine so the computer can go into closed loop as soon as possible and pass emissions.
Logistics Pro
Joined: Jan 2007
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From: Martinsburg, WV
Correct, it really wasnt until OBDII that multi-bank monitoring was the norm, even then the early iterations were just upstream monitoring, a little later on they added downstream monitoring as well due to more stringent emissions regulations to check for catalyst efficiency.
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