P1153 - Really just turn it off?
04-30-2008, 09:31 PM
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P1153 - Really just turn it off? Okay so we're dealing with an 01 Z that just got headers and is having this problem. I know it is easy to just turn the code off and forget about it like everyone says, but something interesting is happening...and I just wonder if it has anything to do with the 1153?
Avg's AT WOT...
Bank 1:
O2 ~ 920's
Inj PW - 20msec
Bank 2:
O2 ~ 880's
Inj PW - 17msec
Now this is definitely an issue. And obviously the Injector Pulsewidth on Bank 2 is shorter and thus delivering less fuel.
Both O2's are new.
Avg's AT WOT...
Bank 1:
O2 ~ 920's
Inj PW - 20msec
Bank 2:
O2 ~ 880's
Inj PW - 17msec
Now this is definitely an issue. And obviously the Injector Pulsewidth on Bank 2 is shorter and thus delivering less fuel.
Both O2's are new.
05-01-2008, 09:13 AM
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Heater / switching codes are just the earliest symptom
of O2 sensors "going sleepy" from thermal problems,
behind that you may well see some fuel trimming error
from their bent / variable output. Since trims are done
bankwise any + LTFT residues may affect the banks to
different degree. If you have a 10 point LTFT difference
that would account for the PW imbalance. When the
O2s are producing inaccurate output all bets are off
for trim result.
of O2 sensors "going sleepy" from thermal problems,
behind that you may well see some fuel trimming error
from their bent / variable output. Since trims are done
bankwise any + LTFT residues may affect the banks to
different degree. If you have a 10 point LTFT difference
that would account for the PW imbalance. When the
O2s are producing inaccurate output all bets are off
for trim result.
05-01-2008, 10:01 AM
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So, since we can't tune bank-wise, I wonder if I should set out to make sure Bank 2 is above 900mv. This will in turn make Bank 1 a little on the richer side, but at least the Passenger side won't be running lean.
Or I could just leave it. AFR is 13.0 combined, but I'd guess it is somewhere in the mid to high 13's on the Pass side. This may be okay, there is no knock whatsoever.
Or I could just leave it. AFR is 13.0 combined, but I'd guess it is somewhere in the mid to high 13's on the Pass side. This may be okay, there is no knock whatsoever.
Heater / switching codes are just the earliest symptom
of O2 sensors "going sleepy" from thermal problems,
behind that you may well see some fuel trimming error
from their bent / variable output. Since trims are done
bankwise any + LTFT residues may affect the banks to
different degree. If you have a 10 point LTFT difference
that would account for the PW imbalance. When the
O2s are producing inaccurate output all bets are off
for trim result.
of O2 sensors "going sleepy" from thermal problems,
behind that you may well see some fuel trimming error
from their bent / variable output. Since trims are done
bankwise any + LTFT residues may affect the banks to
different degree. If you have a 10 point LTFT difference
that would account for the PW imbalance. When the
O2s are producing inaccurate output all bets are off
for trim result.
05-01-2008, 03:08 PM
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Don't bother guessing based on the O2 voltages,
there is no good data to be had there. See about
cleaning up the fuel trims if those are pushing WOT
enrichment / PW. If there is no trimming push then
you should see equal PW both banks.
there is no good data to be had there. See about
cleaning up the fuel trims if those are pushing WOT
enrichment / PW. If there is no trimming push then
you should see equal PW both banks.
