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Old 08-07-2017, 06:46 PM   #1
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O2 sensor

Ok so I bought a new mid pipe that I went to put on in the garage. I've done a few exhaust/O2 sensor repairs and replacements on other cars.. Just nothing on the 04 GT.

So I went to disconnect all four O2 sensors and the passenger upstream sensor seems almost impossible to get to. I was only going to drop the stock mid pipe before I had to leave and focus on installing the new one tomorrow. I didn't get that far yet hah. So does anyone know if it's easier to get to that sensor from the engine bay or should I try and drop the mid pipe then try to get an angle on it after that? Or am I completely wrong and nobody had had this issue before?
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Old 08-07-2017, 06:57 PM   #2
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If it would stop raining, I would pull my car onto the ramps to see whether or not I can get to the up stream sensors.

I ASSUMED that the upstream sensors were on the exhaust manifold, and only the downstream sensor was located on the midpipe.

Where is Scotty, Keeny, or Rapinator when you need one of them?
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Old 08-07-2017, 07:00 PM   #3
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That's what I assumed too.. However the new mid pipe has four O2 bung threads on it. And when I got under it definitely has 4 on the mid pipe. My 2 other experiences with O2 sensors had the upstream on the manifold.
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Old 08-07-2017, 07:03 PM   #4
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I found a video. You need to drop the pipe to get to the upstream sensors.

https://youtu.be/OeDDTWDOPsg
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Old 08-07-2017, 07:04 PM   #5
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https://youtu.be/OeDDTWDOPsg

Well look at that. Just watched this video and it clearly states and shows the guy dropping the mid pipe before removing the sensor because it easier

I asked the forum because I trust the members here. Sorry I didn't do my research before that everyone!

---------- Post added at 01:04 AM ---------- Previous post was at 01:03 AM ----------

Hahaha revvv thanks buddy must have been doing this at the same time
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Old 08-07-2017, 07:06 PM   #6
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I was curious. I had to know. Watching the video is easier than crawling under my car in the rain.

Plus, at some point I would like to change out the midpipe on my car. It's good information to have.
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Old 08-07-2017, 07:11 PM   #7
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I appreciate the help and I'll post a video of how it sounds after the install. It will be BBK off road x pipe will SLP loudmouth 1 catback. I've heard many mixed reviews on sound from that combo. If it isn't what I want or like then I have an alternative plan so this is all experimental for me.
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Old 08-07-2017, 07:13 PM   #8
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It is going to be loud. It will sound good though.
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Old 08-07-2017, 07:13 PM   #9
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Also I have a bama x4. So once I install the x pipe do I just turn the sensors off in the options and call it good or do I have to request a new tune? And do I need the extensions or MIL eliminators at all?
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Old 08-07-2017, 07:21 PM   #10
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Bama / AM removes the option to turn the sensors on and off in their rebranding of the X4. I just asked them this same question. You will need to ask for a new tune, or buy a set of MIL eliminators from LMR.

If you have their free tunes for life just have them rewrite a tune. It will take a day or so, but if a competent tuner is on hand the X pipe will be taken into consideration if there is any power to take advantage of.
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Old 08-09-2017, 12:23 PM   #11
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Remember when you are dropping the mid pipe that you need a 1/2" universal for the passenger side flange since a 3/8 shallow is too... well shallow to get on and a deep well is too deep. 1/2" universal and shallow socket gets on.


Also as far as O2 sensors if you are dropping the pipe I NEVER **** with them till the pipe is off besides just unplugging them. Take them off from the removed pipe were you have a ton of room to work.
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Old 08-09-2017, 12:26 PM   #12
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Help me with an essential brain fart. What is a 1/2" universal?
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Old 08-09-2017, 12:27 PM   #13
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1/2" drive. Not 3/8 drive or 1/4 drive.
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Old 08-09-2017, 12:31 PM   #14
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Thank you for the boost in my moment of stupidity.

Running on brain fumes today. I spent most of my night diagnosing, then repairing a sunroof that refused to close.

In the pouring rain nonetheless.

There is nothing like working on a vehicle too big for a garage, in the rain, with an umbrella. The water finds its way down the back of your shirt, and continues South to crack valley.
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Old 08-09-2017, 06:47 PM   #15
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Ok so I got 7 of 8 nuts off the studs. I went to remove the front side nut on the passenger side flange and well once again Scotty was right (didn't read this until after fighting it for a while). My 15mm deep well too deep (space is limited) and my 15mm regular socket is too shallow (stud length). So I will be searching for something in between lengths tomorrow at work in the most unorganized tool boxes ever.

Also is it normal for the nuts to be 9/16 at the cat back end and 15mm at the upper end?

Regardless of the frustration I love doing my own work on this car and enjoy it too much.
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Old 08-09-2017, 06:54 PM   #16
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15mm shallow, 1/2" drive socket with 1/2" universal and there you go. If you have a harbor freight near you their tools are cheap and they work. I've done a ton of "heavier duty" stuff with the chinese HF tools including 3 transmissions and only thing that broke was a 3/8" universal and they replaced it free.
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Old 08-09-2017, 07:07 PM   #17
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I need to save this thread when I get my hands on an O/R midpipe.
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Old 08-09-2017, 07:15 PM   #18
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Quote:
Originally Posted by scottydsntknow View Post
15mm shallow, 1/2" drive socket with 1/2" universal and there you go. If you have a harbor freight near you their tools are cheap and they work. I've done a ton of "heavier duty" stuff with the chinese HF tools including 3 transmissions and only thing that broke was a 3/8" universal and they replaced it free.

I do have a 1/2" drive 15mm shallow but the only universal I had was 3/8. That plus the reducer that I had to use wasn't cutting it length wise. So I'll grab the 1/2" universal tomorrow. Thanks Scotty. Anything else you can think of that I might run into?

And yes harbor freight is 5 minutes away. Love it. Only ratchet/socket based tool I don't care for are their extensions which have too much free play in them in my opinion.
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Old 08-09-2017, 08:00 PM   #19
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Exhaust... Fun stuff.
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Old 08-09-2017, 08:09 PM   #20
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Originally Posted by phatspeed7x View Post
Exhaust... Fun stuff.
It's normally easy. With these cars everything is packed in abnormally tight.
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Old 08-09-2017, 09:13 PM   #21
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Oh tell me about it. I was lucky and was able to use a lift for both my exhaust installs. I've ran Manifolds with an off road H pipe. And now long tube headers and a X pipe.
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Old 08-09-2017, 10:38 PM   #22
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I was able to replace the upstream O2 sensors on my Bullitt without having to remove the exhaust. It wasn't easy, and you will be having thoughts of doing bad things to the engineers employed by Ford, but it is indeed possible.
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Old 08-10-2017, 07:54 AM   #23
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I was able to replace the upstream O2 sensors on my Bullitt without having to remove the exhaust. It wasn't easy, and you will be having thoughts of doing bad things to the engineers employed by Ford, but it is indeed possible.
I would have pulled the k member after fighting long enough.
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Old 08-10-2017, 09:37 AM   #24
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I remember having to replace the upstream O2 sensor on my 94 Z28. Talk about tight. Had to go from the top of the engine with a "custom" extension.....

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Old 08-10-2017, 09:41 AM   #25
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You should have tried putting a full exhaust on a WS6 Trans Am. I really did drop the K member.

It took all weekend.

I miss that car.
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Old 08-10-2017, 02:14 PM   #26
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Yeah working on F bodies is an experience...
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Old 08-10-2017, 02:16 PM   #27
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Yeah working on F bodies is an experience...
They are called "F" bodies for a reason.
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Old 08-10-2017, 07:06 PM   #28
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Well I got the "special" nut off the way Scotty said to. Took the stock mid pipe off. Put the upper 2 pipes on. Connected O2 sensors and was relieved I got that far... Then look down aaaaaaaaaand... rookie mistake I forgot to order the O2 sensor extensions for the downstream sensors.. Damnit! So I ordered them.

Also, I got the new tune emailed from bama so I'm hoping I'm ready once the extensions show up.

Live and learn I guess!
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Old 08-10-2017, 07:22 PM   #29
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Why do you need o2 extensions?
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Old 08-10-2017, 07:25 PM   #30
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The BBK mid pipe O2 bungs (threads) are further down the mid pipe than they are stock. Like more towards the rear of the vehicle. So the originals will not reach.
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Old 08-10-2017, 07:48 PM   #31
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I didn't even hook up my rear o2 sensors when I did my X pipe install. Just had the tune shut off the rear sensors.
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Old 08-10-2017, 07:54 PM   #32
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The BBK mid pipe O2 bungs (threads) are further down the mid pipe than they are stock. Like more towards the rear of the vehicle. So the originals will not reach.
I would have ordered the MIL eliminators just to make sure things worked as they should. That would have given a few more inches of room.
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Old 08-10-2017, 08:12 PM   #33
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I would have ordered the MIL eliminators just to make sure things worked as they should. That would have given a few more inches of room.

You mean in addition to the extensions? Shouldn't the new tune take care of the MIL? God I hope the extensions are long enough to take care of the length issue...
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Old 08-10-2017, 08:14 PM   #34
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The extensions should be long enough.
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Old 08-11-2017, 10:42 AM   #35
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Quote:
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I didn't even hook up my rear o2 sensors when I did my X pipe install. Just had the tune shut off the rear sensors.
I ended up getting extensions for mine. I was kinda worried about leaving them disconnected and having moisture ruin the ends somehow. That way I could slap the stock midpipe back in and hook everything up, should the need ever arise.
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