wowwwwwwww
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Joined: Nov 2009
Posts: 203
From: bloomfield nj
wowwwwwwww
What a difference an oxygen sensor makes, i cant believe how much power i was losing from having a bad oxygen sensor .The sensor was in front of the precat and was only going on after along drive on the highway.I changed the maf sensor thinking that could be the problem but because no cel light was coming only after a long drive.My car peels out and feels like my ls1 transam.WOWWWWWWWWWWWW
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My car doesn't have primaries connected, they are in the trunk. My secondaries are plugged into the primary port.
Even if all 4 O2 sensors were gone, the ECU will go off of MAF for AFR control. Under WOT, when we feel the power, MAF is in control, always, and if it's bad, power will suffer.
It was the MAF changing that made th power difference.
Even if all 4 O2 sensors were gone, the ECU will go off of MAF for AFR control. Under WOT, when we feel the power, MAF is in control, always, and if it's bad, power will suffer.
It was the MAF changing that made th power difference.
My car doesn't have primaries connected, they are in the trunk. My secondaries are plugged into the primary port.
Even if all 4 O2 sensors were gone, the ECU will go off of MAF for AFR control. Under WOT, when we feel the power, MAF is in control, always, and if it's bad, power will suffer.
It was the MAF changing that made th power difference.
Even if all 4 O2 sensors were gone, the ECU will go off of MAF for AFR control. Under WOT, when we feel the power, MAF is in control, always, and if it's bad, power will suffer.
It was the MAF changing that made th power difference.
MAF thread #5120.
So you mean to say your down streams are acting as your primaries. ...ok.
Right...
I can see you have all of the answers. Please stay away from my car...
The maf will adjust the afr, yes, when in open loop (wot) and the o2 tells the ecu what minor changes to make(closed loop). If the o2 is trashed, it can put the car into limp mode, and then the fun is over.
wot=more than 75% throttle so unless you floor it everywhere you go, the maf won't do it reliably or very well on its own.
Last edited by sc0tty8; Sep 10, 2011 at 05:31 PM.
Pretty much, yeah. He does.
What he's saying is that he has no pre-cats on his car because of the headers. Therefore, it doesn't matter where the primaries are connected, as long as they're before the main cat. His O2 simulator is spoofing the signal that the secondaries would normally send after exhaust was filtered through the catalyst that is no longer there.
I don't have a sim actually. I bout 2 of them and sold them both.
SES light has been on since I put the headers on, I don't have inspection here.
SES light has been on since I put the headers on, I don't have inspection here.
Last edited by NmexMAX; Sep 10, 2011 at 05:50 PM.
I have 4 codes, and my city MPG is FTL. Highway mileage is fine. Mixed is 24 (cal'd it yesterday)
Open loop closed loop occurs not what the FSM says, but 1600 and below no load, MAF voltage (essentially air usage) and isn't the "40%, etc" that the FSM states, myself and eng92 have seen this since Cipher lets you know when you're open/closed loop mode.
Open loop closed loop occurs not what the FSM says, but 1600 and below no load, MAF voltage (essentially air usage) and isn't the "40%, etc" that the FSM states, myself and eng92 have seen this since Cipher lets you know when you're open/closed loop mode.
What I got is SiM or no SIM - your max runs fine without your pre-cats. You have an inspection failure of the CEL/SES; which is an automatic fail in an inspection state. I think the inspecting CPU logs the CEL/SES, so there is no way for the mechanic to ignore it; is that right? Your O2 Sensor after the Main cat is your "primary" because of wiring. Is that what keeps you running normal? If that is the case that may be what Scotty was referring to. But either way I have a CA spec which will return home eventually so I need to know this cuz I want some headers and need to know how to pass smog. thanks for the help pre-ciate ya.
I also have a test pipe, no cat here. The 5th gen doesn't have a sensor after the main cat.
There are a couple of guys running here with their secondaries just hanging in the engine bay or even bunged somewhere in the exhaust stream without a light.
Hit or miss it seems like. BUT, I believe this would work because like I said, I have my secondaries plugged into the primary port, and I DO NOT have any secondary codes, even though I have no pre-cats.
There are a couple of guys running here with their secondaries just hanging in the engine bay or even bunged somewhere in the exhaust stream without a light.
Hit or miss it seems like. BUT, I believe this would work because like I said, I have my secondaries plugged into the primary port, and I DO NOT have any secondary codes, even though I have no pre-cats.
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GreekMaxima
5th Generation Maxima (2000-2003)
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May 9, 2003 05:06 AM
