ive had some noise pinging i believe, sometimes worse than others, i had someone locally scan my car with hptuners and we noticed some KR about 4 degrees at WOT sometimes above 4500 rpms and we could hear some pinging here and there,unfortunatly it wouldnt do it when i got it scanned as badly as i have heard it sometimes, also does it sometimes at low cruiseing rpm like 1800rpm and under, so anyway we cant figure out why its doin it, its a stock tune no hypertech or any of that crap. and i run 93 octane all the time. what could be cause this i am goin to do some tune up stuff this weekend plug/wires/fuelfilter/seafoam/pcv valve. and see if gets better but if anyone else has some ideas lemme know

 

here's a copy of his scans...i think theirs something up with his clutch because sometimes at low rpms he gets 14+* of KR and I can hear what I think is detonation at higher rpms...not sure if they are related but he gets 1-5* of KR after 4500 rpms in most situations thats audible. Any help would be appriciated as to his next step...i told him to just start small with plugs/wires/fuel filter & go from there.
http://mysite.verizon.net/whenn1/1.30.06aKR.csv
http://mysite.verizon.net/whenn1/1.30.06bKR.csv
http://mysite.verizon.net/whenn1/1.30.06cKR.csv

 

First KR event I see, he's at 70kPa MAP with the AFR still
commanded at 14.6:1; that seems to me to be well into
where power enrichment might want applied (and then
more spark, maximizing output at some expense to fuel
economy).

Also see ECT is rising up during / after this first part throttle
pull, indicating the coolant system is not under control. That
appears not to be the root of the problem, but perhaps a
contributor at times?

Next event seems to have no good reason, the PE is in before
KR hits, spark is pretty low advance. Multiple hits. I'd wonder
about mechanical noise as a possible issue.

There seems to be either substantial PE mode enable MAP
hysteresis, or delay; I see the AFR going back to stoich
well after the TPS and MAP have dropped. I wonder about
the intrinsic lag in the knock sensor, KR "path" and by how
much the KR event might lag the actual trigger. Perhaps
the problem is in the tip-in and KR just shows up late.
Also peculiar, how KR just "disappears" (1.8, 2.3, 2.2, 2.2, 0?)
about line 1990. Not used to seeing that. It makes me think
something's flaky.

Some wisps of tip-in KR, TPS open followed by lean dip and
then knock.

The first real WOT pull, see substantial KR. I have to question
the relation of real fueling to commanded because at 11.7:1
I only see 850mV, sometimes less, on the NBO2s. I would have
expected, and have seen higher mV on my stock-logs setup
with a higher AFR (12.7:1 gave me 875mV or so (but now
-way- higher with headers). I wonder what a MAF cleaning
would do (K&N in mod list, but I may have already given that
lecture I think?). Has it been done lately? His dynamic cylinder
air just reads a whole lot lower than mine, (.69, vs my 0.8x
at MAP=100kPa? That's some discrepancy, reinforces my MAF
suspicion).

That's only about halfway through the "a" log and I have to
get back to work... but food for thought, anyway.

 

ohhh yeah to add in me and my buddy descreened the maf a couple weeks ago, the noises were there before doin that but just thought id throw it in so u know, and i will probably try a cleaning the maf when i do my tune up with some electrical parts cleaner, what are your thoughts on descreening the maf, ive heard bad and good but ive heard alot of people say they have done it with no issues but if anyone thinks its really really bad ill pickup a new maf with the screen again. i also will get a new airfilter a good old fram lol if the maf seems it was really dirty maybe due to my oily k&n

 

most will say the maf with nothing done is about as good as it gets, myself included(was not aware of !screen)

 

K&N goo != "nothing done"... just nothing intentional.

 

does the screen make a large diffrence, somethin that i wasnt aware of before, i will buy a new maf if need be(used but untouched), oh and when i descreened it i also smooted the housings out with 2000grit sandpaper to make it glass smooth. but like i said the noises and stuff were there before i touched the maf

 

What type of timing was the computer trying to run?

Oil consumption is a issue I run into often on the LS1's. if your pulling alot of oil threw the intake it will make the car ping in no time.

I owned a 01 Z28 that would audibly ping on the factory tune. The damn thing was fast as hell (12.7 with just airlid/catback.. no gears or anything else) AFR was good on the dyno, timing was like around 21-22 but I did know it was pulling oil up threw the intake.

Sadly a 18 wheeler hit it on the freeway and totalled it.

 

well i do consume a bit of oil(little more than a bit,2 quarts an oil change about) could it be my pcv suckin oil in, my motor runs well doesnt smoke minimal very light piston slap only when 1st started cold mostly sense i switched to mobil1 witch will be comin out asap also, my TB blade was not very dirty or oily lookin when i checked it, does the oil not dirty the blade and just go in behind the blade, if so ill do a catch can asap and see what it catches, and thats funny my friends get in my car and say mine seems fast as hell for some reason. with similar mods though i havent run it yet so i cant tell for sure i did race a SLP SS camaro and beet him.

 

Two oil uptake paths, through the PCV valve (behind the
blade) and through the PCV makeup air port in the TB.
That one "should" be flowing in toward the crankcase but
I'm convinced at WOT with blowby it can reverse and then
you will have a snail track from the port down one side of
the TB throat.

I would be very interested to see what happens from -only-
cleaning the MAF, to your dynamic cylinder air numbers.
And then from swapping on a dead-unmolested stocker.
The first being quantitative results for the "K&N oil is bad"
effect and the second, the effect of descreening. Make
with the science, chop-chop. One log with a full 2nd gear
pull as-is, one cleaned, one swapped. Then on to the PCV
oil question, with the SeaFoam.

 

hmm well i have no issue with doin the logs with before and after cleaning id have to pick up a maf somewhere thats unmolested but it would just be a matter of foff667 being willing to do another scan with me one day and take a little time to try those things, i got no problem paying you to scan it again if need be. but i will take your word on the k&n thing now lol its comin out and a frams goin in, is there any other higher flow filter thats not oiled

 

well tonite i put in a fram filter and i cleaned the maf with crc electrical parts cleaner, it was so dirt and **** that just spraying it didnt do it, i used a cu-tip and very gently was able to clean the MAF sensors went from black to a nice new gray silver finish, i took it out and it seems that did the trick i didnt hear any ping i will try again tomaro to make it wasnt a freak period of no ping but i think it did it.

 

Get the airflow logs, I'm itching to see just how much
change dirty/clean made.

 

ok i think im shootin down to get it logged again tomaro night so we will see then but again this morning i pulled it hard and no ping.

 

The one I told you about htat pinged on the stock tune had a stock fitler in it.

Also, quite a few cars we test drove pinged audibly at wide open. I think the gas is a bit crappy here or something.

 

well after cleaning the maf the ping/noise and KR went almost completely away according to HPtuners scanning, but figureing i neeed it i did a tune up(plugs ngk tr55's,msd wires,fuel filter,seafoam,pcv valve,oilchange) but low and behold i take it out for a ride and the damn noise is back full force. i dunno what the hell to make of it, definatly sounds like detanation buti dont know why. not only that but i would think if i was detnating before with my old plugs they would show sign of overly hot cylinder temps on the plugs but they all came out lookin a light brown just right, 1 plugs had a little black on it but still not lookin like overly hot cylinder temps to cause problems, but maybe my plugs r lying lol, i know the car had Denso plugs i guess iridiums in it but everyone seems to recomend the NGK tr55 regular v-powers so i used those, were these people wrong and iridiums are the way to go

 

A can of Seafoam always cures my pinging problems which result from the build up of carbon deposits from oil consumption