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O2 bypass for exhaust???

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Old 09-30-2017, 12:36 PM
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O2 bypass for exhaust???

hey guys I found this connector and was checking on it and I was told when they put the new exhaust on my 350 they bypassed the O2 sensor and is this normal? If this isn’t the O2 sensor then what is this?????? Its right in front of the R12 system and comes out of the passenger wall frame
Old 09-30-2017, 02:24 PM
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Re: O2 bypass for exhaust???

The o2 is on the other side of the engine purple wire.
Old 09-30-2017, 02:32 PM
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Re: O2 bypass for exhaust???

Originally Posted by Tuned Performance
The o2 is on the other side of the engine purple wire.
would you happen to know what this one might be then?
Old 10-03-2017, 09:38 AM
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Re: O2 bypass for exhaust???

Looks kinda like where the underhood light would plug into.
Old 10-04-2017, 05:38 PM
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Re: O2 bypass for exhaust???

I couldn’t find the purple wire that you’re talking about for the O2 sensor would you happen to know what it might look like check engine light is on and the brake light and I’m just trying to figure out why I know the paperclip trick but I just can’t seem to read the codes I may have to buy an old code reader
Old 10-04-2017, 05:51 PM
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Re: O2 bypass for exhaust???

You can see the hole in the drivers side manifold bye the outlet.

Old 10-05-2017, 07:47 AM
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Re: O2 bypass for exhaust???

I couldn’t find the purple wire that you’re talking about for the O2 sensor would you happen to know what it might look like
Not to be a twit, but... it's purple. Should be on the driver's side of the motor, on / over / just below / around that valve cover, depending on whatever whoever did whatever with it whenever they messed with it.

I know the paperclip trick but I just can’t seem to read the codes
Why? Seems like few things could possibly be any eeeeeeeezier? What's causing the trouble?

BTW, capitalization and punctuation are your friend. Your posts are EXTREMELY hard to read without them. Try making sense out of the sentence "I helped my uncle, Jack, off his horse", typed the way you typed your posts.

Last edited by sofakingdom; 10-05-2017 at 07:50 AM.
Old 10-05-2017, 09:47 AM
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Re: O2 bypass for exhaust???

Originally Posted by sofakingdom
Not to be a twit, but... it's purple. Should be on the driver's side of the motor, on / over / just below / around that valve cover, depending on whatever whoever did whatever with it whenever they messed with it.

Why? Seems like few things could possibly be any eeeeeeeezier? What's causing the trouble?

BTW, capitalization and punctuation are your friend. Your posts are EXTREMELY hard to read without them. Try making sense out of the sentence "I helped my uncle, Jack, off his horse", typed the way you typed your posts.
your response makes no sense lol my post isn’t hard to read if you actually read it no punctuation or capitalization is needed it’s a simple post haha
Old 10-05-2017, 09:47 AM
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Re: O2 bypass for exhaust???

Originally Posted by Tuned Performance
You can see the hole in the drivers side manifold bye the outlet.

a picture is worth a thousand words thank yu for that!
Old 10-09-2017, 02:47 PM
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Re: O2 bypass for exhaust???

your response makes no sense lol my post isn’t hard to read if you actually read it no punctuation or capitalization is needed it’s a simple post haha
His post makes PERFECT sense. ....and while perhaps mildly abrasive, he's offering sound advice. Many of us simply ignore the posts all together. I know where MY o2 wire is, so feel free to write however you'd like.
Old 10-10-2017, 12:26 AM
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Re: O2 bypass for exhaust???

Originally Posted by Abubaca
His post makes PERFECT sense. ....and while perhaps mildly abrasive, he's offering sound advice. Many of us simply ignore the posts all together. I know where MY o2 wire is, so feel free to write however you'd like.
Lol o2 or O2 that’s why we all have opinions if you choose to ignore someone’s post over punctuation and not offer sound advice to someone trying to learn and understand then keep scrolling no response is needed, If I wanted advice on how to write a “proper” post I would probably be on a different site, if I’m not mistaken this is a website to help others, not post useless nonsense

Last edited by DylanZ28; 10-10-2017 at 12:35 AM. Reason: oops..
Old 10-10-2017, 10:20 AM
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Re: O2 bypass for exhaust???

Zackly...

I could help some more if I wanted, but after that, ...

Best of luck to ya.
Old 11-03-2017, 10:21 AM
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Re: O2 bypass for exhaust???

Looks like hood light connector (as stated) or also looks a lot like the EST bypass wire on my 1989, the one you disconnect to set base timing. But your car would run poorly if it was disconnected, you would have no electronic ignition advance.

O2 wire is definitely on driver side, and runs from the manifold (sensor) toward the front of the engine to the main harness.

Good luck.
Old 11-06-2017, 07:54 PM
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Re: O2 bypass for exhaust???

Originally Posted by FART_NUGGETS
Looks like hood light connector (as stated) or also looks a lot like the EST bypass wire on my 1989, the one you disconnect to set base timing. But your car would run poorly if it was disconnected, you would have no electronic ignition advance.

O2 wire is definitely on driver side, and runs from the manifold (sensor) toward the front of the engine to the main harness.

Good luck.
I believe your right it must be for the hood light nothing else is disconnected even though the motor was swapped for the 350. I am about to put in a 383 stroker and I wanted to make sure it wasn’t something of use, even though hood lights are handy. Still trying to find a diagram to determine that’s what it actually is




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