Lupo222
forum member
Ok, I'm starting a new thread for this because its reached a whole new level for me.
As some of you know, car was running like dog crap. dropping idle and literally stalling, sputtering and jerking and bucking at cruising speed, regardless of warm or cold.
Threw a P2197 and P0171 code (both o2 sensor related on bank 2 and indicate a lean system).
Bank 2 O2 sensor stays around .001 volts compared to .8- on bank 1. Short term fuel trims stay around .9
Replaced both o2 sensors. still having problems on bank 2.
I did have a wideband installed a few months ago, and it doesn't work. There were wires pulled from under the dash. Not sure if there are any o2 related wires under there that could be lose or damaged?
Also, I replaced the valve covers and the VCT grommets may not be seated properly (i swear they were/are) but a carb cleaner vacuum test reveals no deviations in idle anywhere in the engine bay. Vacuum still reads -12 in at idle.
A/C wasn't blowing strong before but when i replaced the o2 sensors (i disconnected the battery) it got stronger. still not 100% but definitely stronger.
Question:
Do you think its electrical? If so, how do I troubleshoot this? I don't even know where the o2 harness runs.
Any other ideas? I've searched and it seems there aren't really too many threads with my predicament (maybe they just didn't datalog it the way i did?) and it seems the answer for most of them is vacuum, a bad MAF, or something TB/CAI related. If it were MAF/TB/CAI/Vacuum related, would that cause the low volts on just bank 2? Seems electrical...
Oh and if you'd like to see my datalogs, PM me and I'll email them to you. Lito and I are troubleshooting but, as tuning is his job, he's busy with other customers as well, and his diagnosis is check the wiring, something I'm not the least bit comfortable doing w/o someone to guide me, either physically or just walking me through it.
As some of you know, car was running like dog crap. dropping idle and literally stalling, sputtering and jerking and bucking at cruising speed, regardless of warm or cold.
Threw a P2197 and P0171 code (both o2 sensor related on bank 2 and indicate a lean system).
Bank 2 O2 sensor stays around .001 volts compared to .8- on bank 1. Short term fuel trims stay around .9
Replaced both o2 sensors. still having problems on bank 2.
I did have a wideband installed a few months ago, and it doesn't work. There were wires pulled from under the dash. Not sure if there are any o2 related wires under there that could be lose or damaged?
Also, I replaced the valve covers and the VCT grommets may not be seated properly (i swear they were/are) but a carb cleaner vacuum test reveals no deviations in idle anywhere in the engine bay. Vacuum still reads -12 in at idle.
A/C wasn't blowing strong before but when i replaced the o2 sensors (i disconnected the battery) it got stronger. still not 100% but definitely stronger.
Question:
Do you think its electrical? If so, how do I troubleshoot this? I don't even know where the o2 harness runs.
Any other ideas? I've searched and it seems there aren't really too many threads with my predicament (maybe they just didn't datalog it the way i did?) and it seems the answer for most of them is vacuum, a bad MAF, or something TB/CAI related. If it were MAF/TB/CAI/Vacuum related, would that cause the low volts on just bank 2? Seems electrical...
Oh and if you'd like to see my datalogs, PM me and I'll email them to you. Lito and I are troubleshooting but, as tuning is his job, he's busy with other customers as well, and his diagnosis is check the wiring, something I'm not the least bit comfortable doing w/o someone to guide me, either physically or just walking me through it.
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