Z06Vette.com - Corvette Z06 Forum

rmracing · 10-12-2003, 05:38 PM

Has anybody had their car shut down for an instant under heavy acceleration? We finally had a day at the track where we had some great grip off the line (I could get a 1.8 60' instead of a 2.1 60' which I normally get). I ran my best ever at 12.1 at 117mph, I was quite happy with it. Just launched at about 2800, fairly quick release of the clutch, and it just hooked.

I tried to repeat the performance. I got a great launch, and when I shifted into 2nd gear and went flat onto the trottle, the motor quit (and was engine braking the car). I pushed the clutch in, let off the gas, and released the clutch, and it fired right back up. I didn't get right back into the gas hard, but got to the end of the strip, shut it down, looked under the hood, everything looked fine, so I started it back up and started driving home.

Everything seems to be fine now, and my inclination is to believe it was a computer glitch. I have had one before where I started the car, and it appeared to be running on less than all cylinders. Turning the car off and on fixed it that time.

There were no codes thrown on the computer, and I didn't see reduced engine power.

Has anybody experienced anything like this? I might take it in for service (I need to get warrantee work done on a leaking diff anyway) and have them look at the computer and ignition components.

Thanks,

Robby

rmracing · 10-12-2003, 05:50 PM

To follow up, and it might just be that I am noticing things I never noticed before, it seems like I now get a very quiet electrical interference through my audio speakers in relation to RPMs. And this is the strange thing, it seems like when I get into the throttle I hear a static electricity sound coming from near the right side of the rear window (near the little black rear defog device).

Does anybody else hear any of this? Again, I don't remember hearing it before, but I wasn't listening for anything either.

Thanks

case2307 · 10-12-2003, 05:50 PM

Sounds like you had AH/TC kick in. Might be a computer glitch that caused it.

rmracing · 10-12-2003, 05:53 PM

Quote:

Originally posted by case2307
Sounds like you had AH/TC kick in. Might be a computer glitch that caused it.

Is that a frequent problem/glitch in Z06's? I had it set in Competition Mode.

case2307 · 10-12-2003, 05:56 PM

Quote:

Originally posted by rmracing
Is that a frequent problem/glitch in Z06's? I had it set in Competition Mode.

I've never had it happen to me but, the way you describe what happened that's what it sounds like. I'm no expert so don't take what I say for law.

Gman2002Z06 · 10-14-2003, 03:39 AM

I read an article about the '02~04 Z06's that in order to reduce the cars tendency to wheel hop...There is an algorithm written into the PCM programming that will act very similar to the T.C. ...And they DID say in the article...That IT CAN AND WILL kick in even with the T.C. turned OFF...

Maybe you hit second gear so hard that the PCM "sensed" some wheel hop and proceeded to cut in per its "anti-wheel hop" programming...

Peace...Gman

rmracing · 10-14-2003, 03:59 AM

Quote:

Originally posted by Gman2002Z06
I read an article about the '02~04 Z06's that in order to reduce the cars tendency to wheel hop...There is an algorithm written into the PCM programming that will act very similar to the T.C. ...And they DID say in the article...That IT CAN AND WILL kick in even with the T.C. turned OFF...

Maybe you hit second gear so hard that the PCM "sensed" some wheel hop and proceeded to cut in per its "anti-wheel hop" programming...

Peace...Gman

I would agree with you if I hadn't made so many runs with HUGE second and third gear scratches. When it shut down this time, the track had more traction than I had ever dealt with, with nearly no wheelhop when shifting gears.

All that being said, where did you read the article?

No Doubt · 10-14-2003, 04:37 AM

As you know in competition mode TC is off but Active Handling is still on.

You also mentioned more traction than normal. If one tire had more traction than the other, under accelleration it could cause the car to want to turn (yaw). The AH sensed this and tried to correct it by braking the opposite side and reducing power.

Social_Engineer · 10-14-2003, 07:18 AM

There is nothing wrong with your car, it's called Limp Mode ... you hit the rev limiter too hard -- in two gears .... probably 2nd and 3rd.

Penforhire · 10-14-2003, 09:40 AM

I've seen odd behavior out of our AH/TC system. I accidentally left it on during one pass and it bogged the launch (expected) but then left me alone, even chirping the 1-2, until my 2-3 shift, when it totally killed power (thought I blew the shift). Odd.

SteveZ06 · 10-14-2003, 11:40 AM

Can I pull a fuse and disable TC/AH?

Social_Engineer · 10-14-2003, 11:46 AM

You should never totally disable TC/AH. Even if there was a way to do it, you always want to run the car on the drag strip in Competition Mode.

IT L GO · 10-14-2003, 12:06 PM

Quote:

Originally posted by Social_Engineer
You should never totally disable TC/AH. Even if there was a way to do it, you always want to run the car on the drag strip in Competition Mode.

Good advice, I know you said you had in Comp Mode. If you shut the motor off for any reason it will default back to TC/AH on.
Like waiting in the stagging lanes of if you stall the car etc.

No Doubt · 10-14-2003, 05:54 PM

You can turn off TC AND AH by pressing the button once. Pressing it and holding it for about 5 seconds turns off just TC. (enables Competition Mode)

syclone01 · 10-15-2003, 08:36 AM

I assume you had plenty gas in car?? I know my gmc syclone had to have almost 1/2 tank or it would slosh to rear of tank and suck air on launches, it did like 1.72 60ft stock. I know the vette has 2 tanks and they are supposed to be really baffled etc...and less likely it will ever happen.