Newbie Question about Knock Retard

[Powerhouse]

Logged my car earlier and the knock retard showed (9.3) in red. The one next to it showed 0.0. I was just wondering what that meant? Also, the afr commander shows about 14.6 cruising and around 12.5 under load, is that good? Sorry for the dumb questions.. lol.

[joecar]

Powerhouse, welcome to the forum...

Any KR is not good, it means the PCM detected knocking and is reducing ignition timing to prevent it; either it's real knock (which may or may not be audible; 9 degrees of KR would be...), or it's false (knock sensors picking up valvetrain noise, or other reason...).

Your commanded AFR's look right.

The one next to it showed 0.0

I'm not sure what that is, can you post a pic (see howto post #2: http://forum.efilive.com/showthread.php?t=3064 )



If you saved a log file, can you post it this thread.

Not dumb questions... it would be dumb to not ask...

Cheers
Joe

[Powerhouse]

Yeah, i have a log.. I'll upload it in a second

[Powerhouse]

Here is the log file. It's towards the 11.12.37sec mark.

http://files-upload.com/389731/Log_0001.efi.html

You HAVE to click on the link. You can't right click save as..

[Powerhouse]

What would knock sound? Also.. my car is a 2000 Camaro SS M6 with:

Futral F14 cam 232"/234" .598 "/.598" 112LSA
Patriot dual Gold Extreme valve springs
Comp cams Chrome Moly Pushrods 7.400 (Stock Length)
Futral motorsports ported LS6 oil pump
LS2 timing Chain
90mm FAST intake manifold
90mm Nick Williams Throttle Body
30lb SVO injectors
Mac Mid Length Headers
Off road ypipe
QTP electric cutout
Mac hi-flow muffler welded in stock cat-back
MTI lid w/K&N
Nitro Dave’s 90mm Plate nitrous system
NX Bottle Heater
Nitro Daves console switch center
860 Spare tire well Bottle mount
Nitrous outlet solenoid brackets
Nitrous outlet digital dual window Switch
LC-1 Wideband o2 sensor
Optima red top


I don't really hear anything out of the ordinary and it only does it in first gear.

[joecar]

What would knock sound?

Sounds like popcorn popping, or marbles bouncing around; if it was happening, you would hear it at open throttle as you increase RPM.

[Powerhouse]

It only does it in first though... wouldn't it do it in all gears?

[joecar]

You have an LM1 wideband connected, is it calibrated...?

Your LM1 is indicating very lean actual AFR...
1st gear: actual AFR 20+ very lean, very very bad.
2nd,3rd: actual AFR 16-18 very lean, also bad.

You're already aware that lean promotes knocking.
If your LM1 is calibrated (or even if it's not), do not drive the car until you get this resolved.

You say you can't hear any knock...?

The knock sensors may be picking up valvetrain noise, but your actual AFR is indicated very lean by your LM1.

LM1 AFR/BEN indicates your VE, MAF, IFR tables are not dialed in.

The KR shown in 1st gear has sawtooth jaggedness, indicating that it's probably real knock, and it's duration is sustained for 4+ seconds;
remove a few spark plugs and inspect them (take pics) for signs of detonation/preignition.

Also, you may have a little too much ignition advance.

[Powerhouse]

Well fawk. Let me load up my tune so maybe you can check it out

[joecar]

Wait, you said you have an LC-1 installed...?

An LC-1 and not an LM-1, right...?

In that case we need to log the LC-1 AFR/BEN pids.