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Author Topic: Finally figured out why I've been running so rich  (Read 11446 times)
savages4
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« on: December 26, 2012, 07:40:51 PM »

So I've had my rear oxygen sensors plugged in the whole time, didn't think it would cause any problems.  However after reading a post by Nehalem I saw he noted that the rear sensors even with the deletes cause wacky readings for the primary o2s.  After unplugging them and reseting the ECU, I have almost doubled my gas mileage and my car has so much more low end torque, I'm very happy.  Thought I would post this for anyone else who is catless and can barely breath in their car and are blowing through gas.
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mightemouce
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« Reply #1 on: December 27, 2012, 02:50:25 PM »

Just an FYI I have seen something similar happen when EGTS are coded out but left plugged in. Caused weird readings on my primary o2s when logging the car
« Last Edit: December 28, 2012, 07:45:05 AM by mightemouce » Logged
phila_dot
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« Reply #2 on: December 27, 2012, 02:56:11 PM »

Just an FYI I have seen something similar happen when rear EGTS are coded out but left plugged in. Caused weird readings on my primary o2s when logging the car

Rear EGTS?

If rear O2's are coded out completely and properly, then they will have no effect at all.
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ddillenger
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« Reply #3 on: December 27, 2012, 02:58:54 PM »

There seems to be a lot of conflicting information going around. I think the wiki needs updating. I just read through the entire "emissions delete and setting actual readiness" thread. Very helpful.
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savages4
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« Reply #4 on: December 27, 2012, 06:49:09 PM »

Believe me the rear O2s are coded out properly, and without them unplugged they are heavily effecting my fuel curve near idle, it was running very rich.  I don't believe you can unplug the EGTs even though they are coded out or i would.
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ddillenger
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« Reply #5 on: December 27, 2012, 06:53:26 PM »

Something is wrong.
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phila_dot
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« Reply #6 on: December 27, 2012, 06:55:42 PM »

Believe me the rear O2s are coded out properly, and without them unplugged they are heavily effecting my fuel curve near idle, it was running very rich.  I don't believe you can unplug the EGTs even though they are coded out or i would.

Have you modified CLRHK and CDLATV? CWKONLS? ESKONF?

EGT's can be removed if done properly.

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phila_dot
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« Reply #7 on: December 27, 2012, 06:57:14 PM »

Something is wrong.

Not exactly true
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ddillenger
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« Reply #8 on: December 27, 2012, 06:58:17 PM »

So rear o2 sensors (properly coded out, but still hooked up) can cause you to run rich?
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phila_dot
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« Reply #9 on: December 27, 2012, 06:59:56 PM »

So rear o2 sensors (properly coded out, but still hooked up) can cause you to run rich?

Ahh...you ninja edited on me.

No, that was my point originally.
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ddillenger
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« Reply #10 on: December 27, 2012, 07:05:10 PM »

My original post said "rear o2 sensors have no effect on fuel trims"

But as I haven't read the entire FR, I couldn't say that with absolute certainty so I edited it. Experience, however, has shown me that there is likely an issue with the way he's coded the rear o2's out. The simplest explanation is usually the best.

I think we're saying the same thing. I think he should post up the log of changes he made, or the original and modded file.

Ninja edit-

Been browsing your map switching routine. Very nice.
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nyet
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« Reply #11 on: December 27, 2012, 11:45:26 PM »

There seems to be a lot of conflicting information going around. I think the wiki needs updating. I just read through the entire "emissions delete and setting actual readiness" thread. Very helpful.

Yea. I'd like to have a digestible summary of what needs changing, because I still don't know the right way to do it.
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phila_dot
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« Reply #12 on: December 28, 2012, 06:23:51 AM »

CDKAT = 0
CWDLSAHK = 0
CDHSH = 0
CDHSHE = 0
CDLATV = 0
CDLASH = 0
CDLSH = 0
CDLSHV = 0
CLRHK = 5
CWKONLS = 17
ESKONF - below as applicable

Parameter  Location  Original(hex)  Original(dec)  New(hex)  New(dec)
ESKONF 10C7A 00 0 C0 192
ESKONF (M box) 10C7B F3 243 FF 255
ESKONF (L box) 10C7B C3 195 CF 207
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mightemouce
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« Reply #13 on: December 28, 2012, 07:43:47 AM »

Rear EGTS?

If rear O2's are coded out completely and properly, then they will have no effect at all.

Sorry just ment EGTS typo while I was out work trying to not sit on the forums too long. I can try and dig through some of my logs showing my 02 voltages with the EGTS plugged in and then with them unplugged I saw it happen on two cars now.
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phila_dot
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« Reply #14 on: December 28, 2012, 07:53:26 AM »

Sorry just ment EGTS typo while I was out work trying to not sit on the forums too long. I can try and dig through some of my logs showing my 02 voltages with the EGTS plugged in and then with them unplugged I saw it happen on two cars now.

Where they coded put properly?

CDATR, CDATS, and CATR
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