Running lean, will O2 simms help
Thread Starter
Teching In
Joined: Jan 2002
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From: Dallas
Running lean, will O2 simms help After dynoing this weekend, I found I was running lean. I have hit this point, not in great detail, in a few other posts. This is the one issue that has not been addressed.
I have cat bypass pipes, and no O2 simms. My SES light has been on since I did this mod. After dynoing this weekend, I found I was running lean. My air/fuel ratio was about 13.5-13.6. Will putting on the O2 simms help me with my leanness? Is it affecting my performance to have the SES light on. It's been on for quite a while. Does the car run in a different mode having that warning light on? My only mods, if that makes a difference to you, are in the sig. Any advice is appreciated
I have cat bypass pipes, and no O2 simms. My SES light has been on since I did this mod. After dynoing this weekend, I found I was running lean. My air/fuel ratio was about 13.5-13.6. Will putting on the O2 simms help me with my leanness? Is it affecting my performance to have the SES light on. It's been on for quite a while. Does the car run in a different mode having that warning light on? My only mods, if that makes a difference to you, are in the sig. Any advice is appreciated
I can shift faster than you.
iTrader: (21)
Joined: Nov 2001
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From: Baton Rouge, LA
Re: Running lean, will O2 simms help The rear 02 sensors are only there to monitor the cats and have no effect on performance.
Putting in the 02 simms will only turn your SES light off. <img src="gr_grin.gif" border="0">
Putting in the 02 simms will only turn your SES light off. <img src="gr_grin.gif" border="0">
Thread Starter
Teching In
Joined: Jan 2002
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From: Dallas
Re: Running lean, will O2 simms help So how on earth am I running lean with the mods I have done? The free mods in my sig are descreening the MAF and free ram air mod. Nothing else. What do I do?
<img src="gr_eek2.gif" border="0">
<img src="gr_eek2.gif" border="0">
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
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From: Troy, AL
Re: Running lean, will O2 simms help It's not the removal of the cats that's making it lean. O2 simms will not help and no, having that SES light from not having O2 simms does not effect performance in any way.
Do you have a ported MAF sensor or MAF ends? Any Autotap data? HPP3 tuning installed?
Do you have a ported MAF sensor or MAF ends? Any Autotap data? HPP3 tuning installed?
Thread Starter
Teching In
Joined: Jan 2002
Posts: 24
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From: Dallas
Re: Running lean, will O2 simms help My only mods:
no cats
whisper lid/K&n
descreened stock Maf
Free ram air mod
cutout
factory exhaust
No HPP3, No autotap, No Ported Maf(or granatelli), No Maf translator, No ECM changes.
no cats
whisper lid/K&n
descreened stock Maf
Free ram air mod
cutout
factory exhaust
No HPP3, No autotap, No Ported Maf(or granatelli), No Maf translator, No ECM changes.
Thread Starter
Teching In
Joined: Jan 2002
Posts: 24
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From: Dallas
Re: Running lean, will O2 simms help This is stupid, but what does an autotap look like. A shop hooked up a thing that looked something like a power programmer to my port. I believe it had GM on it. I saw him scroll and choose chevy, camaro, 5.7L v-8. He ran some numbers, then said "yup it's running real lean...are you running O2 simms....that will help". What things that would show up on auto-tap would affect running lean? Any thoughts colonel, nine ball, anyone.
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TECH Senior Member
Joined: Nov 2001
Posts: 9,246
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From: Troy, AL
Re: Running lean, will O2 simms help Ok, Autotap is a software that you install on your PC (ideally a laptop) to read and record computer parameters. It comes with a cable that goes from your diagnostic port (under the dash below the steering wheel) to your computer (serial port.) You can buy it from most of our sponsors. You'll also need a laptop computer.
What your dealer guy was using was a Tech II which does most of the same things as Autotap and more. If he checked it with the car sitting still he could not see what your WOT mixture is. He probably noted that the Ltrims are positive which is indicative of a computer that is trying to correct a perceived closed loop lean condition. This does not necessarily mean that your WOT mixture is lean. That should be checked by monitoring the B1S1 and B2S1 O2 sensors during WOT operation.
Also, that guy was %100 wrong about O2 simms having anything to do with your mixture and you can tell him I said so! <img src="gr_images/icons/wink.gif" border="0"> <img src="gr_grin.gif" border="0"> <img src="gr_images/icons/wink.gif" border="0"> The rear O2 sensors are for emissions monitoring only.
[ January 22, 2002: Message edited by: Colonel ]</p>
What your dealer guy was using was a Tech II which does most of the same things as Autotap and more. If he checked it with the car sitting still he could not see what your WOT mixture is. He probably noted that the Ltrims are positive which is indicative of a computer that is trying to correct a perceived closed loop lean condition. This does not necessarily mean that your WOT mixture is lean. That should be checked by monitoring the B1S1 and B2S1 O2 sensors during WOT operation.
Also, that guy was %100 wrong about O2 simms having anything to do with your mixture and you can tell him I said so! <img src="gr_images/icons/wink.gif" border="0"> <img src="gr_grin.gif" border="0"> <img src="gr_images/icons/wink.gif" border="0"> The rear O2 sensors are for emissions monitoring only.
[ January 22, 2002: Message edited by: Colonel ]</p>
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Verdad Gallardo TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Running lean, will O2 simms help BTW, you can see a screenshot of the DOS and Windows versions of Autotap at www.LS1Speed.com Look under the "1998-2002 F-body" section and then click "PCM and Electical".
[ January 22, 2002: Message edited by: Colonel ]</p>
[ January 22, 2002: Message edited by: Colonel ]</p>
Thread Starter
Teching In
Joined: Jan 2002
Posts: 24
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From: Dallas
Re: Running lean, will O2 simms help THe car was checked while sitting still. It took him all of 1 minute to tell me the car was running lean, and I had bent pushrods because I had hit the revlimiter 192 times.
So let me get this straight,and tell me if you agree. I have had a couple of posts and have found the following
1) He offered to sell me O2 simms to correct my leanness, and that is incorrect
2) He offered to change my ECM settings to LS6 settings because my LS1 ecm settings were not optimal for my LS6 intak, and that is incorrect.
3) I had to have O2 simms to do the ECM reconfiguration, or sh*t would get f**ked up, and that is incorrect.
4) He offered to port my maf, after I got the O2 simms, and they took care of my lean condition, but since the O2 simms wouldn't take care of my lean condition, the ported MAF may make me run more lean.
5) He offered to do the IAT resistor mod sayng it was "bad-***", and that is incorrect
Do you concur, disagree with any of the previous?
Also, I would like to thank the site administrators for there patience in dealing with someone who does not have the technical knowledge they have. You kept me from getting screwed out of a couple of hundred bucks, and have not made me feel like an idiot.
Thanks
<img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
So let me get this straight,and tell me if you agree. I have had a couple of posts and have found the following
1) He offered to sell me O2 simms to correct my leanness, and that is incorrect
2) He offered to change my ECM settings to LS6 settings because my LS1 ecm settings were not optimal for my LS6 intak, and that is incorrect.
3) I had to have O2 simms to do the ECM reconfiguration, or sh*t would get f**ked up, and that is incorrect.
4) He offered to port my maf, after I got the O2 simms, and they took care of my lean condition, but since the O2 simms wouldn't take care of my lean condition, the ported MAF may make me run more lean.
5) He offered to do the IAT resistor mod sayng it was "bad-***", and that is incorrect
Do you concur, disagree with any of the previous?
Also, I would like to thank the site administrators for there patience in dealing with someone who does not have the technical knowledge they have. You kept me from getting screwed out of a couple of hundred bucks, and have not made me feel like an idiot.
Thanks
<img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
Thread Starter
Teching In
Joined: Jan 2002
Posts: 24
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From: Dallas
Re: Running lean, will O2 simms help Yeah, I think future purchases and service from this guy is on hold.
But, the question that has not been answered is why in the heck am I running lean? On all three pulls of my dyno, I was running between 13.5-13.6.
I lost a little less than 1 hp, and 1 tq each pull!
But, the question that has not been answered is why in the heck am I running lean? On all three pulls of my dyno, I was running between 13.5-13.6.
I lost a little less than 1 hp, and 1 tq each pull!
