O2 sensor bung May 06, 2018, 04:44:29 PM rock auto has two size injector bungs or injector "nuts" shown.which one (qty2) do i buy?this will allow me to screw in my 02 sensors to my exhaust i have yet to hand build.i have a bunch on room on my header near the and i am considering putting the bungs on the headers so they are easy to remove later. Quote Selected
O2 sensor bung Reply #1 – May 07, 2018, 03:52:28 PM You will want to install the O2 bungs on the collectors of the header and preferably at or above the 9:00 to 3:00 positions. You will also want to run a ceramic coated header to trap the heat as this is critical to the O2 sensor. The sensor needs heat to function properly but too close to the cylinder head will cause it to be too hot and run lean and too far away and it will run cold and run too rich. Most header companies put the bung in the collector and from what I remember most reported that the ceramic units performed better. The car will idle a little rough on initial start up but should clean up and on really cold days it will take a little longer to clean up. If you have a tuner you can adjust this out in the timing tables.Correct thread pitch for the O2 sensors is 18mm x 1.5. Quote Selected
O2 sensor bung Reply #2 – May 07, 2018, 05:33:03 PM The EEC-IV, for a 5.0 Mustang, expects the sensors to be in the pipe just past the shorty header collector. I'd put it in the same place. Quote Selected
O2 sensor bung Reply #4 – May 07, 2018, 07:29:29 PM Quote from: Aerocoupe;465611Not possible with long tubes.I thought he was running shorty headers? Quote Selected
O2 sensor bung Reply #5 – May 07, 2018, 11:33:45 PM Yup my mistake there no mention of LT’s. Was reading one of Vinny’s posts and crossed them up.If using shorties the O2 sensors go in the pipe just down stream of the fire cone connections. Quick google search will show you where. Quote Selected
O2 sensor bung Reply #6 – May 08, 2018, 10:37:57 AM yes, running stainless shorty headers.not to say i know anything here but i did some self paced vid watching early today.apparently,, i need to have the o2's located where i can get a min of 600degF before the o2's start making voltage.for obd2, the o2 is the backbone of the eeciv system,, yet if i dont get the maf correct,, the o2 placement is up in the air.i got to thinking,, which can be something i get carried away with but...would'nt it be cool if the physical location of the o2 sensor was adjustable?meaning its home can be calibrated.im thinking a slot cut long ways on your pipe.the o2 mounts to a plate that then the plate mounts to the slot cut out in your exhaust.the mounting would be something simple like stainless clamps... then you can slide the 02 upstream or downstream to achieve the optimum voltage,, of what i think is around a half volt???????a gasket for high temps like asbestos or something would be need to seal it off.just thinking out things, ,, i know its prob a stupid idea but being as the o2 has so much power in the eec fuel strategy,, it really seems like its placement can make or break you,, so why not make it something you can calibrate.?? instead of being a stationary thorn in your side because you put it in an area thats too cool or too hot. Quote Selected
O2 sensor bung Reply #7 – May 08, 2018, 01:54:37 PM For the most accurate O2 sensors, go with the 4 wire ones.Get away from using the sensor threads as the ground side of the sensor and have copper wire all the way back to the EEC. Quote Selected
O2 sensor bung Reply #8 – May 10, 2018, 07:39:22 AM The o2s (hego) for your car are heated, that's why there are 4 wires. They should still be close to the collector to minimize latency between combustion and measurement, but being heated, they aren't vulnerable to deficiency in exhaust temp affecting the time it takes them to warmup and start reading. Quote Selected
O2 sensor bung Reply #9 – May 10, 2018, 07:50:23 AM Actually.....3 and 4 wire are both heated. The 4th wire is a dedicated signal return instead of the orange wire at the back of the intake. John Quote Selected
O2 sensor bung Reply #10 – May 10, 2018, 08:05:21 AM yeah, both my new o2's are 3wire per the 87evtm as well. Quote Selected
O2 sensor bung Reply #11 – May 10, 2018, 09:27:08 AM His sensor is still 4 wires, whether the signal ground goes to the back of the head (orange wire) or all the way to the EEC. Grounding to the the engine IS noisier, but with high quality grounds and ordinary noise suppression methods, it should be good enough for his purposes. The point I was making, however, is that his 87 doesn't ground the sensor through the threads, and it is heated. Quote Selected
O2 sensor bung Reply #12 – May 10, 2018, 09:34:24 AM LOL,, you arei right again,,, here i is that ground wire point........... which is under the braided cable i made... it is orange.i located my original braided flat ground lead so i removed this one i show and installed the original. Quote Selected
O2 sensor bung Reply #14 – May 11, 2018, 09:13:47 PM Well, shiznit. I guess I take it back. Quote Selected
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