I took my C6 to my first HPDE event up at Limerock Park on Thursday the 14th.... Awesome time and can't wait to do it again. BUT... after the second session I noticed I had the CEL on. I checked Oil Temp, Pressure, Coolant, Tire Pressures, brakes, etc and all seemed to be operating fine. The car was running nicely so I kept going. I ran two more sessions with the CEL on and got progressively faster and more aggressive. I was running hard in 3rd and 4th gear (Z51 package with M6, CoW booster but basically stock car) for all these sessions. I was running with all the Nannys on as this was my first event and I wanted to be as safe as possible.

I got home and checked the Codes with my ELM and reader software. I got P0101 MAF Circuit Performance and P0201 Injector 1 Problem.. I cleared the codes and only the day after getting home did I notice that the car is idling rough. After coming to a stop (at a light, etc) it will idle at approx 600-700 then surge up to 1100 - 1200 and then fall back down and stumble at 500-600RPM.

Today, I changed my oil and filter, put my ceramic street pads back on and generally cleaned up the car (it was filthy and wheels covered with rubber 'pellets' from the track... what a hoot). I had the car out to run up the oil temp a bit and after it got warmed up, I punched it in 2nd gear close to WOT.. The CEL came back on...

Checked the codes again and I get P0201 (P0101 did not reappear) and two that I can't identify... C3101 and C3400.. These seem to be be undefined for LS2. hmmm?? Anyway, I cleaned out my stock air box, and filters. I didn't take out the MAF sensor off to clean as I ran out of steam today. I also checked all connections at Cylinder 1 plug, wire and coil.. All looked good.

Soooo.. should I just get on down to CoW or does anybody else have any suggestions?? It's interesting that running the car HARD at the track seems to have brought on these Codes and Idling issues. I drive aggressively on the street but obviously not 120MPH and WOT for 20 mins at a time. After clearing the codes, the CEL stayed off UNTIL I punched it in 2nd gear this morning... That's my story. Hoping somebody has some wisdom to impart..

 

Sounds like the injector or the circuits feeding it may have an issue. Maybe it doesn't like to get hot anymore. There is an extensive diagnostic to go with that code. Your one time code P0201 may have indicated something to help narrow down the problem. Both it and the P0101 have the Ignition One circuit in common.

Bill

 

".....I was running with all the Nannys on as this was my first event and I wanted to be as safe as possible."

Obviously, do what you feel is best but IMO you'd be better off (and safer) running in Comp Mode. If you feel safer to start with full AH intervention fine but I suggest you at least shutoff TC when you're on the track. Not only do you always want to shutoff TC when going WOT but more importanly, TC intervention on a road course is IMO dangerous....you expect the car to do one thing and it does something else. Comp mode is a good 'track' learning tool...it eliminates the dangerous TC intervention and reduces AH intervention. In time, however, you'll find any AH intervention slows you down.

Unfortunately, I don't know what's causing your mechanical problems or what the mysterious "C" fault codes are. I'd speculate the "C" is for computer or chassis but that's just a SWAG. Perhaps they're some 'hidden' manufacturer's trouble codes? Check with a dealership or with the other vendor/shop you mentioned. Good luck on the problems and keep tracking you car!

 

Really does sound like you're having an injector 1 problem, so you're wanting to have that checked out. The MAF code could actually be the Cow intake, as the cars ECU is calibrated pretty close for the factory set up. Chuck can probably help you out on this. I agree with "Wayne" on backing down the nannies a bit on the track, especially TC. I never use TC on any of my cars, unless it's raining. Comp mode's pretty good on the track, but just shut everyting off now, as really the best way to feel what's really going on.

 

On our C5, I did the same. But our C6 A6 allows me to leave rubber if I get on it, the current TC is almost too soft.

 

Do you feel it's safe to drive the car (normally) on the street while I wait to get in for service and have someone look at this??

 

fyi, I know your not from the area, but for his first time he did the right thing leaving all the nanny's on. Lime Rock has a big elevation change, at the top of the hill fast cars can get the tires off the ground. T/C on is safest for that situation. My z in comp mode surprised the heck out of me the first time running it there after years in a c5... 3 foot tail wag on the uphill in comp mode at 1/4 throttle with the wheels pointed straight ahead. Yes, T/C can get in the way in other areas, but first time out, he did the right thing for that track.

Back to the problem at hand, did you unplug the battery and let the computer reset/relearn? While it is likely a real issue that is one good thing to try to rule out an easy fix.

 

I haven't disconnected the battery.. This fix-all doesn't seem applicable for an Injector issue.. I'm trying to research cleaning the injectors and decide if I wanna try it.. Waiting for CoW to call me back as he's been out of town and is probably jammed up. Also, with the car idling so rough I think there is something going on.

 

Did you check the injector for voltage or swap one injector for another to see if the code changes like I mentioned in your other thread?

That would be the first thing I would do. It leterally takes just a few minutes to do this. Pm me if you need help.

 

I've really found most T/C systems to be more a pain than anything. On my C5, wouldn't allow any wheel spin at all, almost getting me rear ended a couple times, pulling into traffic on loose pavement. The C6 system allows some spin, but sometimes cuts power in the middle of a steering correction. My daily FWD Pontiac, seems to go through snow better without T/C with some spin, than just sometimes sitting at zero with T/C on. I've just learned to automatically shut it off, every time I start the cars now.