-48 KNK on cylinder 3 at 19 mph

[whiped]

Anyone else have this?

Anytime my car is at 19kph I get a -48 on IGA_AD_1_KNK[2]

It only happens at 19kph and only that cylinder. It happens regardless of if I'm accelerating or braking.

No other odd behavior.

[abamfo]

Yes I sometimes see that number randomly in my logs and have seen it in others logs also... I don't think anything of it

[whiped]

I never noticed it until I randomly selected the cylinder while logging something else. Thought it looked a bit funny so logged all the cylinders.

It is only that cylinder and happens every time my speed is 19 kph regardless of gearing. Just odd.

[SwankP3RF3ct10n]

Could be something causing excessive vibration or a sound close to knock at that speed and close enough to the knock sensor that it picks it up as knock. Maybe look at it from that perspective. Or take off your CW and see if it still does it. I'd tell you to flash back to stock and test, but you can't do that. If you change the tune of the car and you still have the same issue, you know it's outside of that perspective.

[whiped]

Could be something causing excessive vibration or a sound close to knock at that speed and close enough to the knock sensor that it picks it up as knock. Maybe look at it from that perspective. Or take off your CW and see if it still does it. I'd tell you to flash back to stock and test, but you can't do that. If you change the tune of the car and you still have the same issue, you know it's outside of that perspective.

I was going to pull the CW tonight and see if it still does it. Never noticed it before but it is always at 19kph.

Seems to be more software related than actual hardware. I don't find it very likely that the engine always misbehaves at exactly that point every time and at no other point anytime.

Happened with both the Ported and non-ported TBs. Just strange.

[whiped]

Anyone else able to replicate this? Tried without the CW and still get the -48 on cylinder 3 at 19 kph.

Does it every time and doesn't have any odd behavior so I am not super worried about it currently.

[SwankP3RF3ct10n]

Does it do this no matter what load? If so, I bet it's outside noise being picked up by the knock sensor somehow. Interestingly, at 10-15MPH I think, the ABS primes and arms... maybe it's that messing with the knock sensor... but it's not like that system is bolted to the damn engine or close enough to act as a tap on the block and cause noise.

[whiped]

Every time regardless of load. Braking, accelerating, cruising. Just weird. No misfires, no other oddities.

Only that cylinder, only at 19 kph. If I have time tonight I will get a log showing it better. Anything you think I should log with it?

[Loe]

can you log throttle valve angle and throttle % along with the usual and email them to me?

[whiped]

Sure, want it with a ported or non-ported TB?

I am heading down to my parents' tonight for Thanksgiving but I will do a couple laps around the block to generate some logs.

And just to confirm, Cylinder numbering is like so correct?

(FIREWALL)
  3 - 6
  2 - 5
  1 - 4
 (FRONT)

If that's the case it might be something with the TB. Happened with both ported and non-ported one as I was logging those when I noticed it.

Any ideas if anything is triggered at 19kph?

[Loe]

Yes, that is the correct cylinder layout. also does it happen in all gears?

[whiped]

Yes, that is the correct cylinder layout. also does it happen in all gears?

From what I saw yes. Haven't had a chance to really dive into it yet.

I'll post some logs when I get home. Don't have my laptop handy currently.

[whiped]

Here is a log cruising around my block: https://docs.google.com/spreadsheets...it?usp=sharing

Got a -48 on Cylinder 5 twice during this. (Lines 640 and 677)

Happens in every gear I tried.
1st
2nd
Reverse (lines 1506-1591)

D/S, comfort, etc didn't change anything
Happens with and without CW, with both ported and non-ported TBs.

Lines 1335 to 1382 show it best.

No other odd behavior, no missfires, no other random spikes....

Thoughts?

[whiped]

Just FYI,

Logged a mostly stock car(Exhaust, intake, cosmetic mods) this weekend and also saw the same behavior.

I'm going to assume this is normal.

I would still like to see some of your guys' logs if possible.

Best bet is to log vehicle speed and knk on all 6 cylinders. Hold the car at around 12.8 MPH.

[Loe]

its concerning that it happens across both cylinders you logged.

[whiped]

its concerning that it happens across both cylinders you logged.

Yeah, still not sure about the ones that pop-up randomly.

The one on cylinder 3 at 19KPH is reproducible and consistent.

The other ones only happen at lower speeds. My logs at WOT on all cylinders look good.

Still need to do more digging though, I'm hoping others will post some logs so I can confirm I am not just chasing ghosts.

I'll post up the log I took yesterday of my buddies car if he still has it.

[whiped]

Here is a log from the other car: https://docs.google.com/spreadsheets...it?usp=sharing

Doesn't move cylinders like it did that on mine but still very obvious.

Anyone else seeing this?

[bhvrdr]

Your throttle position was at 12% when you saw the timing pull. You will not have any meaningful timing corrections at part load like that. You need to take logs at full load ~80 throttle position to get a meaningful. Timing retard will go nuts when lifting.

Mike

[whiped]

Your throttle position was at 12% when you saw the timing pull. You will not have any meaningful timing corrections at part load like that. You need to take logs at full load ~80 throttle position to get a meaningful. Timing retard will go nuts when lifting.

Mike

Thanks for the input Mike.

Car looks fine under full throttle. I was just curious if this -48 is normal or not. The logs posted above were specifically trying to recreate it, not to test anything else.

FWIW, I've seen this happen at WOT as well. It's just hard to get 19kph to pop up on the log when accelerating that quickly

[bhvrdr]

Gotcha. Yeah at part throttle its normal to see very high retard numbers. Itll look all funky. You have me stumped if it happens for less than a second at WOT other than possible at a gear change.

Mike

[whiped]

Gotcha. Yeah at part throttle its normal to see very high retard numbers. Itll look all funky. You have me stumped if it happens for less than a second at WOT other than possible at a gear change.

Mike

Pretty much anytime 19 kph shows up in a log it happens.

1st gear WOT, 2nd gear WOT, reverse(didn't try WOT because that sounds terrifying), braking...

It's just weird, now that I've seen it on a stock car I am not as worried.

Give it a try on your A6, I wonder if it happens there too.

[SpaceMustard]

Pretty much anytime 19 kph shows up in a log it happens.

1st gear WOT, 2nd gear WOT, reverse(didn't try WOT because that sounds terrifying), braking...

It's just weird, now that I've seen it on a stock car I am not as worried.

Give it a try on your A6, I wonder if it happens there too.

Hey Whiped just wanted to let you know I saw the exact same thing with my car tonight, it was at a low speed and low engine RPM. Like others said I think the knock sensor is just registering some external noise/shake? I know my stock downpipes rattle a bit from my AWE Exhaust...