P0174 Bank 2 Lean (forever.......)
11-13-2012, 07:53 PM
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P0174 Bank 2 Lean (forever.......) I have replaced everything, plugs, wires, O2 sensors, coil packs, etc. Sent out injectors to be professional cleaned and tested.
Pulled intake and replaced all gaskets.
When it is cool outside, it seems to run fine. When it is warmer out, (perhaps >80F), the problem starts. Usually I feel it first as a stumble at idle, then a hesitation on accelerating, then really rough (cam like) conditions. Once it starts, B2S1 stays at 0.1V or less more and more often, until it never goes over 0.1V except when decelerating.
Anyone have a suggestion (other than C4) that I can try to resolve this?
ONLY Bank 2, bank 1 O2 always switches properly.
Not that it matters, but stock except for BBK TB and intake, lid, and cat back.
Jon
Pulled intake and replaced all gaskets.
When it is cool outside, it seems to run fine. When it is warmer out, (perhaps >80F), the problem starts. Usually I feel it first as a stumble at idle, then a hesitation on accelerating, then really rough (cam like) conditions. Once it starts, B2S1 stays at 0.1V or less more and more often, until it never goes over 0.1V except when decelerating.
Anyone have a suggestion (other than C4) that I can try to resolve this?
ONLY Bank 2, bank 1 O2 always switches properly.
Not that it matters, but stock except for BBK TB and intake, lid, and cat back.
Jon
11-14-2012, 03:04 PM
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I have replaced everything, plugs, wires, O2 sensors, coil packs, etc. Sent out injectors to be professional cleaned and tested.
Pulled intake and replaced all gaskets.
When it is cool outside, it seems to run fine. When it is warmer out, (perhaps >80F), the problem starts. Usually I feel it first as a stumble at idle, then a hesitation on accelerating, then really rough (cam like) conditions. Once it starts, B2S1 stays at 0.1V or less more and more often, until it never goes over 0.1V except when decelerating.
Anyone have a suggestion (other than C4) that I can try to resolve this?
ONLY Bank 2, bank 1 O2 always switches properly.
Not that it matters, but stock except for BBK TB and intake, lid, and cat back.
Jon
Pulled intake and replaced all gaskets.
When it is cool outside, it seems to run fine. When it is warmer out, (perhaps >80F), the problem starts. Usually I feel it first as a stumble at idle, then a hesitation on accelerating, then really rough (cam like) conditions. Once it starts, B2S1 stays at 0.1V or less more and more often, until it never goes over 0.1V except when decelerating.
Anyone have a suggestion (other than C4) that I can try to resolve this?
ONLY Bank 2, bank 1 O2 always switches properly.
Not that it matters, but stock except for BBK TB and intake, lid, and cat back.
Jon
11-17-2012, 10:10 PM
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Any cylinder missfire codes? Have you checked the valve springs and valves? Perhaps pull that side valve cover and inspect everything carefully. Inspect the injector wiring carefully and check the injector fuse witing carefully for that bank. The injectors have 12volts + all the time, the pcm grnds each injector to open them. Maybe you have a wiring or voltage problem?
Last edited by Camaroo1; 11-17-2012 at 10:20 PM.
11-20-2012, 03:13 PM
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I was throwing out a lean code too and it turned out to be the AIR tube gasket. I guess I didnt put it back at some point and I just bought one and put it on and the code has been away for at least 6 months now.
11-22-2012, 10:19 AM
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OP what kind of MAF do you have is it stock or after market see if you can borrow another stock MAF. i had this problem once turned out the SLP after market MAF went bad put the stock one back on cleared the codes and had no further issues
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11-23-2012, 09:55 AM
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I would check for a vacuum leak. Possibly a deformed rubber boot or broken plastic line, or even possibly a bad pcv valve. I would also check the o2 sensor, possibly switch it from b1 to b2 and see if the problem follows. Also I would only use gm o2 sensors.
