ls1 running terrible
ls1 running terrible Hello all. Recently, my 3rd gear starting going out in my transmission. I knew it was inevitable to need to yank it, which I plan on doing, but figured I'd change out the fluid just in case. Car is running fine. I take it out back, prop it up, change out the fluid, finish my business, put the car back on the ground, go to test drive it, and the car is running like absolute dogpiss. At idle, it is very rough, very very rich (richer than usual, usually it is pretty rich at idle, but the FI adjusts and takes fuel out after about 10 seconds or so), and it does not go away until about 15-20 mins of regular driving.
It has a cam (234/240 @.05), intake, headers and a Borla catback exhaust on it, but it was running JUST fine before I changed the fluid in the t56. There are no 02 sims after the cats, and I know I need them, but they are not there.
I am at a loss. I am not into this FI electronic bullshit. Did I rub an o2 sensor the wrong way? What can cause the FI to take so long to take enough fuel out?
It has a cam (234/240 @.05), intake, headers and a Borla catback exhaust on it, but it was running JUST fine before I changed the fluid in the t56. There are no 02 sims after the cats, and I know I need them, but they are not there.
I am at a loss. I am not into this FI electronic bullshit. Did I rub an o2 sensor the wrong way? What can cause the FI to take so long to take enough fuel out?
How do you know it is taking 10+ seconds to adjust the fuel? What software/monitor are you using to watch the fuel trims? What wideband are you using to monitor the Air/Fuel ratio? What A/F ratio are you seeing at idle?
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I hope this makes some kind of sense.
Any chance you pinched or otherwise damaged the wires going to the O2 sensors (or any other wires) when re-installing the tranny?
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I haven't take it out yet, just changed the fluid out in it. There is only one o2 sensor, and it's in the passenger side collector. Would it throw any codes on an OBDII scan?
It's neither here nor there, but you really should have two O2 sensors up front in the end of the headers (collector). I'd suggest getting a friend or shop with HPtuners or similar to log it and see what's going on. It is very strange that is started doing this with no other changes aside from the fluid!
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It's neither here nor there, but you really should have two O2 sensors up front in the end of the headers (collector). I'd suggest getting a friend or shop with HPtuners or similar to log it and see what's going on. It is very strange that is started doing this with no other changes aside from the fluid!
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Location of the front sensors will change depending on what headers you run, custom exhaust work, etc....but yes, the PCM "watches" 2 O2 sensors on the front channel. The rear sensors don't have any affect on A/F ratio, but rather just monitor catalytic converter performance. Even when you delete them completely without tuning, only an SES light is thrown, but that has NO effect on A/F.
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Verdad Gallardo Location of the front sensors will change depending on what headers you run, custom exhaust work, etc....but yes, the PCM "watches" 2 O2 sensors on the front channel. The rear sensors don't have any affect on A/F ratio, but rather just monitor catalytic converter performance. Even when you delete them completely without tuning, only an SES light is thrown, but that has NO effect on A/F.
Thanks for your help.
The front sensors do control the A/F ratio. The rear ones do not. Sorry if I was not clear on that 
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The only thing I can think of with regard to the transmission/fluid is the speed reluctor/sensor? Could overfilling it cause it to act up? I put about 3.75 in there, not even 4 full quarts.
Im pretty sure over filling the tranny has nothing to do with how the motor runs. A vacumn leak could explain the high idle. The low idle sounds like a miss if the motor its shaking. Is there any lights on?
SES light is on, but I'm almost 100% positive it is because the rear O2's aren't plugged in. I am stumped. I'm going to unplug the battery tonight and clear anything that may have happened since.
So, did a bunch of things tonight. First, I went and got an OBDII scan. Error codes P0102, P0135 and P0155 showed up. P0102 is unexpected, the other two are the rear cat o2's, and is expected. The first one, P0102, says: 'MAF or VAF A circuit low input'. Could that be causing all my problems? Does that mean I need a new MAF sensor?
I also cleared out all codes from the PCM. After I did that, I turned on the car, it ran rich as ****, proceeded to make fireworks out the exhaust at regular intervals, but leaned up over a period of about 5 minutes, with no more popping out of the exhaust. I also took out my air filter, decided to clean it. It is a K&N come to find out, and they sell a cleaning kit for it. That is cleaning right now.
..any ideas?
EDIT: also, I was wrong earlier: there are two o2 sensors in the collectors, one on the passenger side and another on the drivers side. so, that makes 4 plugged in, and 2 missing (cat o2's).
I also cleared out all codes from the PCM. After I did that, I turned on the car, it ran rich as ****, proceeded to make fireworks out the exhaust at regular intervals, but leaned up over a period of about 5 minutes, with no more popping out of the exhaust. I also took out my air filter, decided to clean it. It is a K&N come to find out, and they sell a cleaning kit for it. That is cleaning right now.
..any ideas?
EDIT: also, I was wrong earlier: there are two o2 sensors in the collectors, one on the passenger side and another on the drivers side. so, that makes 4 plugged in, and 2 missing (cat o2's).
Last edited by mrdreex; Mar 9, 2011 at 11:25 PM.
Personally if your getting that code. I would spray the MAF with maf cleaner, the oil on filters can cause problems with the MAF. Also i would pop off the throttle body and clean the sensors associated with that. Should be a 20-30min process or so.
I did take out the MAF, sprayed it with some carburetor cleaner, let it dry, put it back in, and still nothing changed. I also unhooked the wiring harness from it while the car was running, and the cars idle didn't change a single bit, or throttle response, mixture, etc.
I just got done drying/oiling my filter, put it back in, turned the car on, and not 2 seconds after it started up and ran, the SES light came back on after resetting the codes earlier tonight...WTFFFFFFFFFFFFF...the car has ran a grand total less than 10 mins, probably a 1/4 mile distance driven..wtf gives!