running rough till warmed up

[Mogobs30th]

Re: running rough till warmed up

i just scanned it and it threw 6 codes. they are all o2 sensor related. p0131, p0135, p0137, p0140, p0151, p0155. does this help?

i should note that i do not have a cat on it so there is a o2 sim in the one after the cat, which i don't think works

These are your codes....

P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0137 HO2S Circuit Low Voltage Bank 1 Sensor 2
P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2
P0151 HO2S Circuit Low Voltage Bank 2 Sensor 1
P0155 HO2S Heater Performance Bank 2 Sensor 1

If I were to guess, that O2 sim you're using is probably bad. Every code there is pre-cat, but if you're having problems with ALL the pre-cat sensors, then its possible the post-cat is giving off weird or dead signals to the PCM.

I think you have two possibilities here, either replace the cat, and the post O2 sensor, or get a new sim.

[ACiFiC]

Re: running rough till warmed up

These are your codes....

P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1
P0135 HO2S Heater Performance Bank 1 Sensor 1
P0137 HO2S Circuit Low Voltage Bank 1 Sensor 2
P0140 HO2S Circuit Insufficient Activity Bank 1 Sensor 2
P0151 HO2S Circuit Low Voltage Bank 2 Sensor 1
P0155 HO2S Heater Performance Bank 2 Sensor 1

If I were to guess, that O2 sim you're using is probably bad. Every code there is pre-cat, but if you're having problems with ALL the pre-cat sensors, then its possible the post-cat is giving off weird or dead signals to the PCM.

I think you have two possibilities here, either replace the cat, and the post O2 sensor, or get a new sim.

I can tell you watched the video and that obviously he had no idea what his codes were related to!!!
I remember when my O2 sim went wild and my car sounded like that.

[Mogobs30th]

Re: running rough till warmed up

No, didn't watch the vid, because a YouTube vid with crappy resolution and sound is a worthless way to diagnose a problem. I didn't even consider watching the vid. I went off the hard evidence provided to me by the OP, which is how a diagnostic SHOULD be performed. Tell me I'm wrong....

Too many noobs on this site that think these 4th gem cars are like an old school carbeurated forebearers, and they're so far from that its silly. The PCM is there to run the drivetrain and to diagnose problems with it. Why anyone would blindly throw money at an issue is ridiculous.

But lemme ask you this... Do you think 1 bad plug, 1 bad wire, or 1 bad coil is going to play games with ALL 3 pre-cat HO2S's? And the likeliniess of having all bad plugs, all bad wires, or all bad coils is even more slim....you took a shot in the dark, now let the one with experience try....

[Barbadian Camaro]

Re: running rough till warmed up

The reason why I ask if it idles up on first starts and shortly after idle at normal idle speed is to find out first if your Idle Air Control Valve is working if your Idle air is not working you will have such problems because it restricts the Air at a given point and sometimes backfire hesitates alot and throw O2 codes because the mixture isn't where it should be.

[rdoms6]

Re: running rough till warmed up

The reason why I ask if it idles up on first starts and shortly after idle at normal idle speed is to find out first if your Idle Air Control Valve is working if your Idle air is not working you will have such problems because it restricts the Air at a given point and sometimes backfire hesitates alot and throw O2 codes because the mixture isn't where it should be.

it does not idle high