O2 senor bypass?

lockedup5

lockedup5

overcompensating underachiever
Joined
Jan 30, 2008
Location
Burke County (Hildebran)
Looking to bypass the sensor on a '91 explorer. I know some guys bypass them on their buggys. Any info will help. Would it just be cheaper to buy a new o2 sensor? I don't know much about those things.
 
depends on the vehicle, you need to know the output at stoich and then force it, or reprogram the ecm/ecu....

O2 is one sensor I do run (one of only 3...YMMV)
 
Well, having the sensor to adjust for fuel demand would be better for fuel economy and keeping the engine running better. And the sensor is only $47.99 from Advance. I would replace the sensor myself.
 
my 2 cents:

on an OBDI I have had better gains in HP and fuel economy 'blanking' the EGR and leaving the O2's in place.
Its been awhile, but Putting a transistor in the heat sensing connector made the ECU think there was hot gas passing into the manifold.

Leave the O2's alone because they change your AFR based on what they see. Having something constant cant always be good.

On an OBDII, I wouldn't even bother just replace the darn things.
And buy OEM. I have had bad experiences with aftermarket sending bad signals - I back-probed them while the engine was running to check see if I was crazy.
(not naming brands because some aftermarket brands are the OEM for some makes/models)
 
Replace it, only ones worth bypassing are the rear o2 sensors that do nothing but check the condition of the cats. The front o2 sensors actually tell the computer how much fuel to add for the correct air fuel ratio. Without them, it will go into safe mode, which will run the engine richer, (therefore cooler, hence safe mode) but it will kill power and fuel mileage. Many 95 and older cars only have the front set of o2 sensors, and they are needed for proper operation.
 
Get one of those spark plug anti foul adaptors from the auto store. Put it on your 02 sensor bung. it will space the 02 sensor out of the exhaust stream and fool the computer.
 
StudNuts, it's a 1991 Explorer, all that would do is make it run really rich. It has no downstream sensor.
 
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