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3.8 3800 series Firebird o2 sensors 98-02 Locations, how many, replace, clean, use of, & anything else ? Rate Topic: -----

#1 User is offline   jennifersbird 

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Posted 05 February 2013 - 04:58 PM

:driver:I am still working on my 2000 Firebird v6... I am going to put new headers on my 3.8 3800 series II engine. I am currently running stock manifold exhaust, but don't have the o2 sensors hooked up. I also have the CAT removed, and the exhaust is straight back after the y-pipe with no Sensor hooked up. My exhaust then turns sideways in the rear into one Thrush muffler, with one outlet with elbow tailpipe. I'm pretty sure I have all the sensors unhooked or removed. That's 3 sensors all together. I have read that there is 4 sensors, but have only found 3. I plan on putting in new sensors and a better exhaust system this year. I would like to know about the o2 sensors, and their locations. This maybe a variance from year to year or Firebird models, ect... Let me know, It's snowing here, so I'm not re-looking right now, so any info would help, lol...
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#2 User is offline   djfirebird93 

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Posted 05 February 2013 - 07:24 PM

You should have one on each exhaust manifold pipe, and one behind in the cat and one in front of the cat, bringing the total to 4. I haven't looked into mine that closely, but I believe that's what the set up is. i may be wrong. If you only have one at the y-pipe, and one before the cat and one after the cat, then that wouldn't be too far out of the ordinary to have either.
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#3 User is offline   smokinhole 

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Posted 05 February 2013 - 09:10 PM

On 99 there are 3 . 1 below each manifold flange and 1 after cat. Just did my exhaust with Magnaflow cat and duel tailpipe magnaflow muffler.
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#4 User is offline   TheFireMan 

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Posted 06 February 2013 - 11:00 AM

I second smokinhole! 98 and after models only had 3. One each manifold and one after the cat.


A problem i ran into and have seen a few times is this. You order headers that are the same for al fourth gens and have a predrilled o2 bung in the y pipe. Then you order a cat back and dont drill the bung for the after cat o2 sensor. SO you wind up plugging the after cat sensor into the pre cat bung in the y pipe, tripping your ses light. So with a 98+ bird you need to cap the bung in the y pipe and drill and weld in a new bung in the s pipe after the cat and plug in the sensor there. Just a helpfu ltip before you start your planning.
REDRUM
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#5 User is offline   Injuneer 

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Posted 06 February 2013 - 12:09 PM

View Postjennifersbird, on 05 February 2013 - 04:58 PM, said:

...... I am currently running stock manifold exhaust, but don't have the o2 sensors hooked up. I also have the CAT removed, and the exhaust is straight back after the y-pipe with no Sensor hooked up. My exhaust then turns sideways in the rear into one Thrush muffler, with one outlet with elbow tailpipe. I'm pretty sure I have all the sensors unhooked or removed. That's 3 sensors all together.


Why would you run without the pre-cat O2 sensors? They help the PCM control the A/F ratio, and allow it to correct for changes in the engine components. Must get sort of annoying staring at the SES light all the time.
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#6 User is offline   jennifersbird 

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Posted 14 February 2013 - 08:40 PM

Thanks I'll remember that, I have a lot of work to do on this car, but not much, lol...
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#7 User is offline   jennifersbird 

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Posted 14 February 2013 - 08:49 PM

View PostInjuneer, on 06 February 2013 - 12:09 PM, said:

Why would you run without the pre-cat O2 sensors? They help the PCM control the A/F ratio, and allow it to correct for changes in the engine components. Must get sort of annoying staring at the SES light all the time.
Yes, lol, the reason I'm not running any sensors right now is because they are messed up, and the car runs better without them until I can get new ones... I need 2 new sensors for my exhaust manifolds, and a new MAF sensor (the last new one I bought was junk, sent it back, and haven't had time to get back to it).... and I wan't a few other things after those things are hooked up. Thank you all for your help... yes, I'm pretty sure my 2000 3.8 Firebird only has 3 exhaust sensors, 2=manifolds, 1=after cat...
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#8 User is offline   TheFireMan 

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Posted 15 February 2013 - 08:24 AM

Have you racked your mpg since you removede the sensors. It cant be too good without them. Also not having them can be causing alot of misfires when driving.
REDRUM
++++++++++++++++

1998 3.8L V6 FIREBIRD
++++++++++++++++
Rebuilt Engine ~ Pace Setter Headers and Y Pipe ~ 3" Hi-Flo Cat ~ 2.5" Magnaflow Catback ~ 1 Piece Aluminum Drive Shaft ~ 8.5 MSD Wires ~ 1.5" Drop ~ 180* T-Stat ~ 1 INSANE DRIVER
++++++++++++++++

201201 MILES
++++++++++++++++
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#9 User is offline   Tex361 

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Posted 15 February 2013 - 01:12 PM

I have a 3.8 aswell its 98 and I was going to replace the one on the passenger side which is bank 2 sensor 1 I got it disconnect and now I'm just trying to remove the sensor is there any easier way to get it out. I have hardly any room any ideas?

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#10 User is offline   Injuneer 

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Posted 15 February 2013 - 01:59 PM

Get the exhaust system good and hot.
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#11 User is offline   Tex361 

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Posted 15 February 2013 - 02:19 PM

Wouldn't I get burned though?

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#12 User is offline   98firebird 

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Posted 15 February 2013 - 08:11 PM

You'll have to avoid getting burnt, but wrap the O2 sensor with a cold wet rag to remove some heat. Hot metal expands and cold metal contracts. Use an O2 sensor specific socket.
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#13 User is offline   Tex361 

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Posted 15 February 2013 - 08:16 PM

This should be fun. Lol I have the socket for the sensor so hopefully this will go well.

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#14 User is offline   Tex361 

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Posted 17 February 2013 - 08:24 AM

View PostTex361, on 15 February 2013 - 08:16 PM, said:

This should be fun. Lol I have the socket for the sensor so hopefully this will go well.

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DId I mention it has close to 200k miles, and probably never been changed out.
So would it be okay to use a impact ratchet just to get it out?
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#15 User is offline   Injuneer 

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Posted 17 February 2013 - 12:02 PM

If you don't plan on reusing the sensor, you can hack the wire off and use whatever you want to pull it out. Lots of PB Blaster would probably help, left soaking for 24 hours. But they do come out easier if the exhaust is hot.
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381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

NO PHOTOS - MY WEBSITE IS BEING MOVED TO ANOTHER SERVER - SORRY FOR ANY INCONVENIENCE
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#16 User is offline   Tex361 

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Posted 17 February 2013 - 01:31 PM

I cut the wires along time ago ha. And I pb blasted it so now for the impact! Thanks

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