ecot3c inside

iTrader: (11)

great, just noticed I'm getting knock sometimes when I upshift and give it gas, 0.3 knock, but only on upshift. It's probably my plugs as well since I've never touched them for a good 6 months, wanted to change those..

Chevycobaltss3

iTrader: (2)

have you looked at your ve table to verify that your cells are good and within specs. If not you could be getting random kr since the car will go to ve for a split second because the maf skewing.

ecot3c inside

iTrader: (11)

It shouldn't. I mean I'm all maf above 400rpm, maf seems to be in good working condition.. My ve table is "okay", but not great just lazy rather just have all maf. What do you mean by skewing ss3?

Chevycobaltss3

iTrader: (2)

basically when the lsj goes into a speratic throttle percentage change it will go to ve since the maf will skew. Sorta why your call will truly never be a maf only car. I had random kr on my old lsj when my ve wasnt tuned correctly. After i tuned each cell closest to 0 i had 0 kr running 20* up top without meth or e85. My lsj was fun and by far one of the quickest built lsj on a m62. I wanted e85 but no where to get it down here lol.

ecot3c inside

iTrader: (11)

gotcha, i'll just go easy on it until it gets warm enough to mess around with.

Chevycobaltss3

iTrader: (2)

Being safe is best. Ut always having ure tune right on is even better. Tune for the cold if possible.

Black05

I can vouch for Cobalts blowing up out of nowhere.
I didn't get ANY knock for weeks, maybe 0.2 once in a blue moon.

Then all of a sudden at Wot, pop.

Bye Bye Rings/Exhaust Valve.

insylem

Correct my if I'm wrong,
but isnt KR Knock Retard?

Unless I'm mistaken,
Wouldn't that be a measument of how much the PCM is retarding the ignition timing, to prevent knocking?
So if you have a KR of 3.5 then the PCM caught some knock and then retarded the ignition 3.5 degrees, and so now your no longer knockng, and so all is good, even though the KR shows 3.5.

Chevycobaltss3

iTrader: (2)

Once the pcm sees kr yes itl retard the timing but u will still get a itte and if u are getting kr the pcm has to see it to retard it.

insylem

Here is some very useful information that I found Via Google.

ZZ Performance

paddock

iTrader: (2)

ok.. I'm reviving this thread cuz I'm still a bit confused.

I'm, all of a sudden, seeing knock. Thing is, I'm only seeing it for a flash when up-shifting. I've seen it spike up to almost 7.0, but like I said, it don't last more than a blink??

Any thoughts? It's been cool the past couple days (around the freezing mark)... could that be a factor?

I'm just staged (2), with a cold air.

ok.. I'm reviving this thread cuz I'm still a bit confused.

I'm, all of a sudden, seeing knock. Thing is, I'm only seeing it for a flash when up-shifting. I've seen it spike up to almost 7.0, but like I said, it don't last more than a blink??

Any thoughts? It's been cool the past couple days (around the freezing mark)... could that be a factor?

I'm just staged (2), with a cold air.

ecot3c inside

iTrader: (11)

I had the same problem, when winter started I saw some knock when upshifting, now all of a sudden it disappeared. I blame the gas, I cleaned my plugs (helped a little), I tuned my ve table (no difference), I started to see it only once in a blue moon, then it gradually went down to nothing.

insylem

It's called False Knock,
Basicly other engine noise is setting off the knock sensor in the car.
Also could be because of winter gas blend depending on your area.

ecot3c inside

iTrader: (11)

I wouldn't be so quick to judge as false knock, that's when bad **** happens

insylem

Perhaps / perhaps not.

But the source of my information is back in the link on Post #60
Check it out.

SunburstSS

iTrader: (48)

I've noticed when my exhaust isnt a 100 % tighened and is moving around i get upto 4 degrees of knock on normal take off, once ive tightened and readjusted my exhaust and made sure the dp isnt hitting the car i stopped getting that...

I do notice a 0.3 KR from time to time just randomly on the Interceptor, HP Tuners doesnt pick any , I would assume its false knock , i dont knock on wot at all, sometimes like once in a month or so i get a random KR on regular driving which i think its just a bad spot of gas, i do use 93 shell gas, and I have noticed that its the best in my area after multiple testing from local gas stations....

Render2009

iTrader: (4)

I was getting knock at WOT up to 3.0 but I had 91.

denlou

Perhaps slightly off topic, but why would anyone run such an aggressive tune on their daily driver where a 5-10 degree change in temperature or fuel blends make the car knock?

I think if you're at that point and want more power, it's time to upgrade things instead of trying to overload the poor motor with sloppy tuning...

Turbalt2010

iTrader: (4)

not trying to thread jack, but im just running a trifecta tune, i see no knock. BUT how often should you change your plugs?

denlou

When they're worn out heh

Turbalt2010

iTrader: (4)

big help, thanks

ecot3c inside

iTrader: (11)

lol^

also a good tune will not give you any knock

paddock

iTrader: (2)

For what Spark plugs cost.. I'd change them annually at least..