Do NOT remove your rear O2 sensor - Page 7

R4ND0M_AX3 · 03-15-2007, 08:10 AM

I reset the ECU and things are now targeting stoich.

Ooie · 03-17-2007, 04:52 PM

Interesting, I wonder if some of my problems with my AP Stg 2 on my STi is because I have the old fashion 02 sensor mod(using spark plug defoulers) still on my dp. Maybe this is making my car run too rich....?

boostedrex05 · 03-28-2007, 10:53 AM

i dont mean to be off topic even though im still talking about a wideband, does anyone know what the best way to hook up a plx m-300? if so please pm me im lost.

flatthump · 03-28-2007, 11:14 AM

With the stock harness that they supply with the kit?^^

boostedrex05 · 03-28-2007, 09:03 PM

Quote:

Originally Posted by flatthump

With the stock harness that they supply with the kit?^^

lol i wish it was that easy they say they want you to wire it as close to the ECU as possible. thats the IG power and ground and the Narrowband wire and wideband wire. witch is the gray and the white. then you must wire a resistor to top everything off. and the 2 capacitors.

All I really need to know is, If i should find the pin for the 02 sensor on the wire harness to the ECU plug or just run the wires to the stock sensor. and run the normal power and ground to lets say the cigat lighter since my car is a none smoker anyhow.

TheRipler · 03-29-2007, 07:15 PM

Quote:

Originally Posted by R4ND0M_AX3

analog1 yellow

Did you make any changes to the LC-1's output programming for analog1 out?

I'm seeing the same thing. My stock rear 02 is hanging in open air. If I even touch the throttle, idle AFRs on the LC-1 drop to 13.4-13.5 for 20-30sec before returning to 14.7. It bugs me that it's dumping extra fuel in there when it isn't needed, and I'd like to get it straightened out.

R4ND0M_AX3 · 03-29-2007, 08:16 PM

Quote:

Originally Posted by TheRipler

Did you make any changes to the LC-1's output programming for analog1 out?

I'm seeing the same thing. My stock rear 02 is hanging in open air. If I even touch the throttle, idle AFRs on the LC-1 drop to 13.4-13.5 for 20-30sec before returning to 14.7. It bugs me that it's dumping extra fuel in there when it isn't needed, and I'd like to get it straightened out.

no. analog output 1 is preconfigured for a typical narrowband signal.

jays05 · 03-31-2007, 07:49 AM

Quote:

Originally Posted by R4ND0M_AX3

Analog1 yellow to D25 on the ECU connector B137. At the ECU the signal wire for the rear O2 sensor is white. This is for a 2005 US STi.

I already had the wires inside the cabin so I decided to hook up at the ECU. I had wanted to get a dead sensor and use its connector at the fatcory location. I don't know what color the wire is down there.

Awesome, thanks for that. My car doesn't have a rear o2 and I had all the AFR problems mentioned in this thread. I really didn't want to buy a new rear o2 and have a bung welded... I'll try this out once my car has an engine in it again

ride5000 · 12-21-2007, 02:28 AM

Quote:

Originally Posted by jfitzpat

The reason I don't 'see it' is it is actually very, very hard for an ECU to make meaningful fuel adjustments from a post cat sensor. There are tons of SAE, etc. papers on the subject. I've also done work on measuring cat efficiency on the fly myself.

i know i'm late to the party, but i disagree strongly with this statement.

jwild · 02-21-2008, 09:48 AM

Quote:

Originally Posted by Ooie

Interesting, I wonder if some of my problems with my AP Stg 2 on my STi is because I have the old fashion 02 sensor mod(using spark plug defoulers) still on my dp. Maybe this is making my car run too rich....?

I was doing the same thing. I took off my mechanical cell fix (defouler) and the car seems to run better. It hits boost much quicker; at least it seems that way.

I would take your's off, as COBB OTS map was obviously made without the defouler's in place.

Ooie · 02-21-2008, 12:16 PM

Protune did away with all problems

sidwin · 02-23-2008, 05:27 AM

i called cobbs and they said u can pull out the sensor and zip tie it. They said only problem is i might damage my sensor due to road debris but i live in new orleans where salt is'nt a problem.

my supra downpipe didn't have a place for a sensor so i had it zip tied to my tranny brace for 3 yrs. when i went with 4 inch exhaust i put it back in and it still worked surprising.

My car even with the o2 sensor plugged in will go to 13.9 for a couple of seconds and then eventually idles @ 15:1. In all honestly it isn't a big deal.

SmobySport · 03-08-2008, 10:29 PM

Any problems with wiring the analog out to the rear 02 signal yet?

I have been having this same issue for a year now.

R4ND0M_AX3 · 03-10-2008, 09:12 AM

Quote:

Originally Posted by SmobySport

Any problems with wiring the analog out to the rear 02 signal yet?

I have been having this same issue for a year now.

still works. 60K+ on the car now.

03-15-2007, 08:10 AM	#91
R4ND0M_AX3 Grassroots STI Racer Car: 05 Subaru WRX STi Fav Mod: Cobb StreetTUNER Location: Elk Grove, CA USA Posts: 592 Join Date: Jul 2004 Trader Rating: (0)	I reset the ECU and things are now targeting stoich. This ad is not endorsed by this member. Please register or login to hide this ad.

02-21-2008, 12:16 PM	#101
Ooie Professional STI Driver Car: 07 WRX STi Location: Baltimore Maryland Posts: 444 Join Date: Oct 2006 Trader Rating: (2)	Re: Do NOT remove your rear O2 sensor Protune did away with all problems

02-23-2008, 05:27 AM	#102
sidwin Amateur STI Driver Fav Mod: Coming Soon Posts: 38 Join Date: Jan 2008 Trader Rating: (0)	Re: Do NOT remove your rear O2 sensor i called cobbs and they said u can pull out the sensor and zip tie it. They said only problem is i might damage my sensor due to road debris but i live in new orleans where salt is'nt a problem. my supra downpipe didn't have a place for a sensor so i had it zip tied to my tranny brace for 3 yrs. when i went with 4 inch exhaust i put it back in and it still worked surprising. My car even with the o2 sensor plugged in will go to 13.9 for a couple of seconds and then eventually idles @ 15:1. In all honestly it isn't a big deal.

03-08-2008, 10:29 PM	#103
SmobySport Lurker Car: 02 wrx Fav Mod: Coming Soon Posts: 1 Join Date: Jan 2008 Trader Rating: (0)	Re: Do NOT remove your rear O2 sensor Any problems with wiring the analog out to the rear 02 signal yet? I have been having this same issue for a year now.

03-17-2007, 04:52 PM	#92
Ooie Professional STI Driver Car: 07 WRX STi Location: Baltimore Maryland Posts: 444 Join Date: Oct 2006 Trader Rating: (2)	Interesting, I wonder if some of my problems with my AP Stg 2 on my STi is because I have the old fashion 02 sensor mod(using spark plug defoulers) still on my dp. Maybe this is making my car run too rich....?

03-28-2007, 10:53 AM	#93
boostedrex05 Spec C Club Car: 512whp STi Fav Mod: Junior Tuned Location: N.Y Posts: 1,186 Join Date: Dec 2005 Trader Rating: (1)	i dont mean to be off topic even though im still talking about a wideband, does anyone know what the best way to hook up a plx m-300? if so please pm me im lost.

03-28-2007, 11:14 AM	#94
flatthump Enginerd Car: The Spaze Mobile Fav Mod: Tuning Location: South O.C., Ca Posts: 12,648 Join Date: Jan 2006 Trader Rating: (5)	With the stock harness that they supply with the kit?^^