odd question
Thread Starter
Joined: Sep 2005
Posts: 741
Likes: 1
From: North Little Rock, Ar
odd question Just want to confirm with you guys what I think would happen if you switched the banks with the 02s. If you put bank 1 o2 in bank 2 and vise versa leaving them connected in the same wiring harness. The best I can get my head around it one side would go pig rich and the other would go extremely lean. Does this sound right to you guys? I know it is an odd question but was having a debate with some guys. They think it would run the same.
No matter which side you put it in, if it is hooked up to the harness (either side harness) it will read what the Air Fuel Ratio in that bank is... switching sides will just cause the PCM to see bank 1's AFR as bank 2, and vice versa... and it will continue to run, but fuel each bank based on feed back from the opposite bank.
Thread Starter
Joined: Sep 2005
Posts: 741
Likes: 1
From: North Little Rock, Ar
So if the o2 was in bank one harness but bank 2 pipe. Lets say the o2 was reading lean wouldn't it then try to richen the mixture causing bank one to go richer because it is controling bank one injectors? So then the o2 in bank one but in bank 2 harness would read rich making bank 2 go even leaner? Ultimately causing bank 2 to go lean and bank one to go rich? Or am I just way off base?
That's exactly what will happen - it'll run fine when first started, but the second one side needs a fuel trim, it'll do just what you've descibed.
Had it happen to me when the O2 plugs got crossed during an engine swap on another vehicle.
Bird
Had it happen to me when the O2 plugs got crossed during an engine swap on another vehicle.
Bird
Had a Vette owner do that one time because of the way the Vette rear O2 plugs are oriented. He was using the rears with an adapter as fronts after a header install. By the time he drove 25 miles to the dyno his cats were glowing cherry red.
Like I said, it will fuel each bank based on the opposite bank's O2 feedback. And it will only be off by a lot if you have some other problem (vacuum leak, clogged injector(s), exhaust leak)... You should not have large splits in trims between the banks to start with! Yes, if one bank is lean and the other bank rich, it will make the problem worse by what ever percentage the opposite bank was off to start with... whether it will run bad or not really depends on how much it was off.
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Thread Starter
Joined: Sep 2005
Posts: 741
Likes: 1
From: North Little Rock, Ar
Yeah that is what sparked the whole thing. My dad and I just did a cam, intake, and headers on his vette and in our hast and tired and foggy brains, we put the o2s in and swapped them. ran like crap! Was just sitting here thinking at work and a light bulb just went off, one of those ha hah, moments. Glad to know my thinking was correct and won't be fighting an up hill battle this weekend when I go back the 3 1/2 hours to their house to tune it.
One other question. He has a 98 and when I go to tune in SD and fail the MAF, it makes the 98 shift really firm, correct? Do guys tweek the Trans to get it to shift easier while they are tuning VE or do they just leave it alone and deal with it? Will it hurt anything while tuning?
Thanks again.
One other question. He has a 98 and when I go to tune in SD and fail the MAF, it makes the 98 shift really firm, correct? Do guys tweek the Trans to get it to shift easier while they are tuning VE or do they just leave it alone and deal with it? Will it hurt anything while tuning?
Thanks again.