If my o2 sensor is plugged in soon as it reaches operating temp it pulls that fuel and stalls, will the relfash help this problem
i have 370cc injectors emanage and its a 01 2.4L...it seems to be a problem for acouple people....
when u unplug the o2 sensor it jus runs really rich, and u cant use the emanage to turn it down, cause u can only increase with injector pulses not decrease, decreasing deals with 02 and map sensor. so im stumped...
anyone know how to fix the stall out
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You should invest in an adjustable FPR
I was a retard, and now I'm permanently banned.
I do not think this issue is related to a turbo set-up. I have had this issue on my 2001 Z24 all motor. Started after my header install. I can unplug my O2 sensor and it will not do it. Plug it up and it will. I have replaced the O2 sensor twice. I have played with wiring, and other things. I can get it to where it will not stall, but idle really low and studer. From my research this is a common issue on the 2.4's. My 97 Z had it as well. GM replaced the oil pump, and a few other things trying to fix it. That car did not have a header.
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Derek Spencer wrote:If my o2 sensor is plugged in soon as it reaches operating temp it pulls that fuel and stalls, will the relfash help this problem
i have 370cc injectors emanage and its a 01 2.4L...it seems to be a problem for acouple people....
when u unplug the o2 sensor it jus runs really rich, and u cant use the emanage to turn it down, cause u can only increase with injector pulses not decrease, decreasing deals with 02 and map sensor. so im stumped...
anyone know how to fix the stall out
OK the problem starts not when the engine is warmed up but when the factory ecu goes from open loop to closed loop an the only known fix i know of is to un plup the 1st o2 an with this done the ecu cant read the signal an change it an to be able to take fuel out i know that the apexi safc will wurk but im not sure about the e-manage mentioned any more questons feel free to ask
and you dont want to change the pulse with take fuel out of the 3d map to lower
My problem is very very similar to all ur guys' problem......Except my car almost stalls out when its warming up for the first 30 feet down the road......I just got my wideband hooked up and when its sputters and almost stalls out...my a/f goes all the way from 14 to 19, feels just like the computer is cutting fuel cause its not getting a good read from the 1st o2 since its so far down in the header..........So I'm thinking about trying a heated o2 sensor..........
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Bobby(Blown&Pullied) wrote:My problem is very very similar to all ur guys' problem......Except my car almost stalls out when its warming up for the first 30 feet down the road......I just got my wideband hooked up and when its sputters and almost stalls out...my a/f goes all the way from 14 to 19, feels just like the computer is cutting fuel cause its not getting a good read from the 1st o2 since its so far down in the header..........So I'm thinking about trying a heated o2 sensor..........
I have been wondering about the heated O2 sensor as well.
Also for the ones having this problem, do you have a cat, or a rear O2 sensor, or a O2 sim?
I'm running no cat, and for a while ran a Electrical O2 sim (did not work worth a crap). I then switched to a manual O2 sim (the cheap one), and this cold start issue cut out a lot. I would either not have it at all or very minor. I'm now getting a slow response from the primary O2 sensor, and it is coming back. I'm sure it is because my sensor is craping out.
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I have all my stock o2 sensors and aftermarket cat installed.......When I had my old a/f gauge hooked up to my primary o2..it would sit still...and it would do that sputter crap....then when the sensor would start working the gauge would start moving....Thats why I think its from the damn o2 bein so far down...
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Bobby(Blown&Pullied) wrote:I have all my stock o2 sensors and aftermarket cat installed.......When I had my old a/f gauge hooked up to my primary o2..it would sit still...and it would do that sputter crap....then when the sensor would start working the gauge would start moving....Thats why I think its from the damn o2 bein so far down...
I know it has to do with the O2 sensor. I have unhooked mine as someone else stated and no problems. My air/fuel gauge works fine as soon as a start my car. It is a little slow when you first start it, but everyone I have seen on any car is on cold start. My gauge is moving back and forth before any cold start issues.
It does appear it has something to do with the header and placement of the O2 sensor. I know others with headers and no problems.
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I think I'm gonna experiment with one......I heard the Grand prix o2 would fit in our spot so maybe i'll give it a try........but first when I get home after work I'll disconnect the o2 and see how it runs...
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i dont think a heated o2 will make a diffrence the problem is in the factory ecu it dosent matter how much you correct things the factory ecu will correct back an yes this will cause a wideband to freak out i have went threw all this before the only fix i found is un plugging the o2 after a whlie it will throw the check enging light but it stops the ecu from going into closed loop an sence it cant read the signial the ecu cant change your corrections
bryan b wrote:i dont think a heated o2 will make a diffrence the problem is in the factory ecu it dosent matter how much you correct things the factory ecu will correct back an yes this will cause a wideband to freak out i have went threw all this before the only fix i found is un plugging the o2 after a whlie it will throw the check enging light but it stops the ecu from going into closed loop an sence it cant read the signial the ecu cant change your corrections
You are giving the ECU too much credit.
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i have no problem at all leaving the 02 sensor unplugged, jus the fact that i cant adjust my idle cause its unplugged makes me run stupid ass rich, soon as i turn down the pressure on the fpr, it stutters out cause it doesnt get enough fuel, cause of the injector pulses arent enough, the only 6 % injector pulse thing, anyways, we all need to try to search for a solution, cause fuel goes out the DOOOR hahaha same wit plugs and tr6's get expense after awile
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I did some testing on this with my car. This morning was the 3 time I tried this. Watching my air/fuel gauge during warm up. I noticed my gauge does not move as much as I thought it did, actually very little. My very first test (4 in totally) I let it wamr up on it's own. Gauge would maybe move 1 bar each way if any. When the car would switch to open loop (at least when I think it does, I do not have a scanner to verify this), the car will act up, try to stall for about 5-10 seconds, then it is good, and my gauge will work fine at that point. So for 3 mornings I start the car watching my gauge let it wamr up until the RPMs come to right about 1k then idle it up to about 2k or so. first time I did 3k and hold it there. I can see on my gauge the O2 sensor starting to work ( I assume it is getting warm) and no issues with the car.
My thinking on this is what has been said before the O2 sensor is not getting heated quick enough for when open loop comes, and then the computer does not know what to do. I'm thinking of doing a heated O2 sensor as well to see how that works.
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^^ Cool man keep us updated....Also what o2 sensor are you gonna use?
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How many of you are running a AutoMeter (or similar) A/F gauge, hooked to your primary O2 sensor? If you are, try this....... unplug or cut the wire going to the A/F gauge....... Start your car, and let it warm up....... does it still happen?
I have found (on more then one car) that the A/F gauge puts to much of a draw on the signal, and it confuses the ECM. It causes the same simptoms you guys are complaining of.
Just a thought.
For you guys with the wide band, are you running the stock sensor yet?
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^ Yea I "had" a gauge hooked to it......But took it off when I got my wideband..........The car still screws up without the gauge hooked to the o2 wire.....
SpeedracerZ- My stock o2 is still hooked up.........when my car does the sputtering crap the wideband reads from 15 then goes all the way to 19.....then its like something wakes up and boom back to normal ......So obviously something is cutting my fuel at cold start.
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SpeedRacerZ wrote:How many of you are running a AutoMeter (or similar) A/F gauge, hooked to your primary O2 sensor? If you are, try this....... unplug or cut the wire going to the A/F gauge....... Start your car, and let it warm up....... does it still happen?
I have found (on more then one car) that the A/F gauge puts to much of a draw on the signal, and it confuses the ECM. It causes the same simptoms you guys are complaining of.
Just a thought.
For you guys with the wide band, are you running the stock sensor yet?
I do. I will try this but I'm sure it is not the problem, from previous things I have done.
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guyz i got the same prob . except im also running lean.. ive ran my car on the tech 2 system and the only thing they could find was my short trim fuel level was going haywire. i have to put my 2nd o2sensor back in cuz i have a simulator . and once i put it bak in i will take it bak up and chek it out . i am almost convinced its the computer. i have an extra cpu that im goin to get flashed to my car. and hopefully thats my prob... i hope one of us figure this out because its a major pain in the A$$..
Bring this back out. I have now got the ELM5 scantool software and interface. I have been datalogging while this goes on. NOt really sure what is causing this. I have looked at a GTP Os sensor. They are 4 wire. Same 4 wires as our rear O2 sensor. I'm not really sure how to hook it up to our 2 wire harness (for a 2k+ car). I know which 2 wires are the heater on our rear sensor (so should be the same for the GTP sensor), just not sure about the other 2. I was thinking of splicing the heater wires into the stock rear sensor, so the computer would be heating the sensor on start up when it is heating the rear sensor, and not having a switch.
has anyone else done any datalogging on htis issue? I do have one other thing to try as well.
I have been too freakin lazy to datalog and see what I get w/ this problem lol............but............when are u gonna get the gtp o2 and try it?
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