93 FZJ O2 Sensor Delete, Unplug, Or Repair/Replace Them (1 Viewer)

[fj40toycruiser]

I have no emission requirements in NH. I hate the concept of paying for sensors that are truly not doing any wonders for the operation of my rig. For me things like TPMS's, O2 sensors etc have very little value. I personally keep an eye very closely on the mechanics and reliability of all my rigs.

I believe I have recently found a shorted O2 sensor that was causing my EFI circuit to get very hot to the touch but not blow the fuse. In searching for the problem I think I have found that one of the O2 sensors is in the 1 ohm range when it should be in the 11-16 Ohm range. I believe this decreased resistance is causing the heating up of the EFI circuit. So I unplugged the sensor and it seems to be operating fine without one of the O2 sensors plugged in.

What is the general consensus if emissions testing is not required. Delete using an O2 sensor simulator, just unplug it and run it, or do what should obviously fix the short and replace the sensor. If it really is not gaining me much I just assume delete or unplug it and use the money elsewhere in the thousand and one upgrades that can be done.

 

[ZackR]

Unlike some emissions gear (EGR) the O2 sensor is actually helpful in improving driveability. It provides the necessary signal to the ECU to adjust the fuel injection system to achieve the best power and economy at any given situation.

I'd recommend getting the O2 sensor and or wiring repaired. Not that tough or expensive.

 

[LSUfj]

I believe the ECM will default to a rich condition without the sensors. You'll burn more fuel. I'd replace them.

 

[joez]

Remove the PAIR setup, and install new O2 sensors directly in the manifold. Keeps them out of thr elements.

 

[fj40toycruiser]

I think the best O2 sensor is Denso according to the consensus on here right? So far the cheapest I've found it is $130, I trust the mud community so I really hope it is worth it. Time will tell

 

[shoresoccer13]

Just keep them so that check engine light stays off the only lights you want to see are the center diff light and the abs light

 

[Rifleman]

Why don't you just buy the Toyota special service campaign o2 kit that comes with 2 new o2 sensors 4 new nuts and 2 new gaskets all for about 235 bucks.

http://www.risingsun4x4club.org/uploads/Snowrun/

 

[fj40toycruiser]

@Rifleman I would if they were original but they look too new to be original. I doubt the dealer will cover this under this "special service campaign." The PO created a custom exhaust and probably installed these new ones when he did that. I will look to source a new Denso I guess. Not really sure whats drives them to be better than the rest but they certainly are the most expensive that Ive found.

 

[ZackR]

Even if they aren't part of the campaign (you pay instead of the dealer) its still a good deal for the kit.

Part No. 89465-60110

 

[elripster]

You definitely need the O2 sensors. Air flow and mixture set the foundation for the engine's control schema. Other sensors augment mixture and timing to maximize fuel economy, driveability, power, etc... you might read the FSM before altering them. You most likely want to maintain most of the sensor functions which among other things improve operation when cold and things like that.

There are things like the cats that can be deleted without harming the enigne though the converters are probably one of if not the most effective pollution controls on a vehicle. Modern cats flow so well that there is likely little performance to be gained unless you are really tuning the engine to rev to the moon and produce high specific power. Our straight 6's don't usually fit that description.

Frank

 

[elripster]

O2 sensors are very low tech. Your 94 is OBDI and you can measure the raw voltages and ECU voltage corrections at the check connector to see if they are working properly and if the ECU is over correcting for one or both.

I would measure them first and replace if necessary. There are a number of good O2 sensor write ups and here is one... Vf1 voltage

Frank

 

[elripster]

Another good read... http://www.lovehorsepower.com/ToyotaPDFs/24.PDF

 

[Rifleman]

@Rifleman I would if they were original but they look too new to be original. I doubt the dealer will cover this under this "special service campaign." The PO created a custom exhaust and probably installed these new ones when he did that. I will look to source a new Denso I guess. Not really sure whats drives them to be better than the rest but they certainly are the most expensive that Ive found.

I think you may of missed the first part of my post, were i said to buy a set of O2 sensors. I posted the link to the dealership program so you would have all the part numbers you needed, along with a step by step guide on how to change your sensors. Just as an FYI, i just bought, and installed this kit to correct a DTC code 26 i was having. Before i bought this kit i did some on line cost search's, to see who had the best deals, as it turned out the factory kit with 2 sensors turned out to be a little bit cheaper then buying 2 aftermarket Denso sensors. Plus if you buy the Denso sensors, they DON"T come with the nuts or gaskets.