where is my knock coming from?

[whackem04]

can someone look and see if they can figure out where its coming from? I have never seen it go above 8 but i dont want any, please help. And what is BURST KNOCK?

[joecar]

Hi whackedm04,

That's definitely knock shown in your log (sawtooth pattern)... and it sustained for about 9 seconds... could you hear it knock...?

Burst Knock Retard is what the PCM predicts it should remove from ignition timing to avoid knocking... BKR does not show up on the KR pid in the log, it is merely subtracted from timing and you will see the SPARKADV pid drop a few degrees.

I can't really tell if you're running lean at WOT (but it seems so from looking at the pid O2S11-OS2V in your log... but, do not rely on the NBO2 sensors to tell you the AFR at WOT... you will need a wideband for this).

Can you capture another log with these pids (but if you hear it knocking, back off immediately, you already know knock damages your motor):
VSS
RPM
TP
DYNCYLAIR or DYNCYLAIR_DMA
DYNAIR
MAF
MAP
IAT
ECT
AFR or EQIVRATIO
SPARKADV
KR
HO2S11 (not HO2S12 or HO2S22)
HO2S21 (not HO2S12 or HO2S22)
LONGFT1
LONGFT2
maybe SHORTFT1
maybe SHORTFT2

Keep the pid channel count to 24 or fewer channels... you can delete the other pids.

Joe

[joecar]

Also if oil is being ingested thru PCV plumbing, this will help the motor to knock.

[whackem04]

Thanks for checking it out. Im going to log on my way to work and ill post after that. As for the knock I could not hear it only see it when im driving. I also have rerouted all PCV to a catch can and filter and the egr is gone.

[whackem04]

here is the log with all the pid's
THANKS

[hquick]

Post your tune also.
Looking at that....you are stoich right up to and around 100kpa and 60% throttle.
Sounds lean to me.

[joecar]

You should log HO2S21 instead of HO2S12...

yeah that's tricky... the notation works like this:

HO2Sxy

x = bank number: 1=LHS (cyl# 1,3,5,7), 2=RHS (cyl# 2,4,6,8).
y = sensor location: 1=front (before cat), 2=rear (after cat).

[joecar]

You log shows several things...

at significantly large throttle:
- HO2S11 indicates you are probably quite lean;
- LTFT's are adding about 10% (and that's not enough);
- commanded AFR is staying at stoich until TP hits 89%;
- acceleration seems very sluggish (regardless of being a a truck);

sounds to me like:
- PE is not enabling or insufficient;
- IFR, VE, MAF are not corrected;

I agree with Howard.

[whackem04]

here is the tune. You guys are awesome. Thanks for all your input.
Ill switch the o2's and post a log.
Can my tranny cause knock cuz it only seems to knock when im in a part throttle to accel.

[hquick]

Can my tranny cause knock cuz it only seems to knock when im in a part throttle to accel.

I'm not sure....but if it was loaded up at low rev's...yes.