Tobino Posted April 1, 2016 Share Posted April 1, 2016 So I've been having some knock issues where -3 to -5 degrees are being pulled via FBKC driving around town. I needed to head up to my buddies house in Nevada City which is about a 3.5 hour ride from my place in Santa Cruz, so I pulled five degrees of timing and threw in some NOS octane booster then headed out on the drive. Things we're fine although I kept an eye on my knock sum while cruising on the freeway. I had two instances where I saw the Knock Sum start to increase then, boom the car stared pulling HUGE timing. I'm talking -25.00. I didn't even know that could happen. This was with cruise control in 5th gear at 70mph at about 3000RPM at 68 degrees outside. So now I've made it up here, but still have a 3.5 hour drive home and want to make sure I can just limp it home. I'm on CA 91 gas. The engine sounds great, I've never audibly heard anything weird from the engine bay while driving or while sticking my head under there while the car is idling. 2005 LGT Wagon 5MT Mods: Cobb Stage2+ ACN91 OTS Map Tsudo Catless DP Catless Up AEM CIA OBX Catback Stage 2 Competition Clutch and LW Flywheel I attached some logs that I pulled once I saw the timing being pulled. Any thoughts. I also attached a 3rd gear pull I logged about a week ago which seems to be okay. Any input would be very appreciated!-11.75 FBKC.csv-9.65 FBKC.csv3rd Gear Pull.csv Link to comment Share on other sites More sharing options...
solidxsnake Posted April 4, 2016 Share Posted April 4, 2016 FYI, that's FLKC, not FBKC in your logs (learned, not feedback). Also, that's in your low-load, low RPM cell. I wonder if you had some sort of rattle or perhaps just a temporary set of bad gas to cause a ton of (false) knock. The ECU will only start removing that correction (which it already has, if you look in your second log where the knock correction has increased to ~-7deg) if you give in enough load in that cell (<3k RPM, probably around 1.2-1.5 g/rev load). If you baby it and keep the load low, the ECU won't enter fine-correction mode, and won't start adding back timing. To be honest, I wouldn't worry about it too much. Keep an eye on it, and see if it will add back timing on its own. If it does, I'd just keep on driving happily Link to comment Share on other sites More sharing options...
Tuning Alliance Posted April 4, 2016 Share Posted April 4, 2016 COBB OTS maps arent that great.. send us a PM and we can etune, we'll take care of you! They pull alot of timing, and have been known to knock. Contact us for all your tuning and performance parts needs! Etuning the legacy community since 2008! Follow us on FACEBOOK | INSTAGRAM [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
covertrussian Posted April 6, 2016 Share Posted April 6, 2016 As solidsnake said, you probably have something rattling around. 3rd Gear pull looks pretty good, no knock under heavy load. You should also log DAM which shows overall timing advance. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
Phate Posted April 6, 2016 Share Posted April 6, 2016 I generally don't worry about it too much as long as it's not really pulling timing under power, and if DAM stays at 1.000. That said, once I have my pile of parts installed and the car is in a state that I won't be screwing with it for a while, I'll be getting off the canned tune. Link to comment Share on other sites More sharing options...
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