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Old 08-07-2015, 08:01 AM   #15
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Hey all,

I hit the local drag strip tonight in my auto 2014 ZL1, First two passes were good (ptm 5, transmission in "m" for sport mode) On the third pass however, about 2 seconds after slamming the gas the throttle response was gone and it revved all the way up to the redline. My car was dead in the water, while limping off the track I put it back into the "D" position, it lunged hard and returned to normal operations. I made 5 passes afterwards with the shifter in "D" and aside from wheel spin all was well. Why the hell did my car do this? I always baby it and never abuse it..
Is it possible you accidently hit the paddle shifter? That would have put it into manual mode and then you could bounce off the redline. It is hard to say without more description. Was this right off the line or after it had shifted to second or third? On the final 5 passes did you notice just one wheel spinning? How long did it rev to redline? A brief time or for several seconds?
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Old 08-07-2015, 08:02 AM   #16
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Sounds like the PCM basically threw the transmission into neutral or something inside the transmission failed. It is entirely possible for an AT to either work just fine in full automatic mode but not in manual mode, or vice versa, if slightly different combinations of bands and clutches is used.

Is there any chance at all that you didn't get it solidly into 'M', or that the shifter was able to move out of 'M' somehow?

Either way, it needs to be looked at.


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Old 08-07-2015, 08:04 AM   #17
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torque management maybe killing it.....
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Old 08-07-2015, 08:09 AM   #18
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But why would the car coast down to almost a stop just to keep revving at the redline when I would try to accelerate?
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And not move until I put it back into "d"
ooooh i guess I missed that.

yea that sounds pretty odd...
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Old 08-07-2015, 08:11 AM   #19
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It happened a couple seconds after take off, probably was in second or third at that point. And no, I didn't accidentally hit a paddle shift. But hypothetically speaking wouldn't an accidental shift be denied at the rate I was going?
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Old 08-07-2015, 08:28 AM   #20
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It happened a couple seconds after take off, probably was in second or third at that point. And no, I didn't accidentally hit a paddle shift. But hypothetically speaking wouldn't an accidental shift be denied at the rate I was going?
I was thinking more along the lines of you are in first and accidently upshift (so you are no in third) and then it doesn't shift to third automatically because you are now in manual mode.

What about the burn outs? Was only one wheel spinning after this happened?
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Old 08-07-2015, 08:34 AM   #21
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Size:  86.4 KB I completely skipped the water box because I didn't want to burn my stock tires. For all the passes I made before and after this happened there was severe wheel spin, probably because I didn't adjust tire pressure. I kept the car in ptm mode 5 the entire night.
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Old 08-07-2015, 08:36 AM   #22
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I'm not sure if during the wheel spin only one was spinning or both. It jumped a little to the left each time there was wheel spin before hooking up.
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Old 08-07-2015, 08:41 AM   #23
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I'm not sure if during the wheel spin only one was spinning or both. It jumped a little to the left each time there was wheel spin before hooking up.
Check it by seeing doing a burnout in a empty parking lot. If you leave one mark it is likely a clutch in the differential gave out (or worse). That could result in enough feedback to the transmission to "knock" it out of gear like Norm is saying. Wheel hop is a Biatch!
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Old 08-07-2015, 08:54 AM   #24
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No chance the shifter moved out of place or wasn't securely in place. But I agree with Norm, the car behaved like it was thrown into neutral some how.
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Old 08-07-2015, 08:57 AM   #25
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No chance the shifter moved out of place or wasn't securely in place. But I agree with Norm, the car behaved like it was thrown into neutral some how.
Not so much the shifter as the transmission itself disengaging clutches that made it act like it was in neutral.
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Old 08-07-2015, 09:59 AM   #26
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Could be an issue with only 1st gear, seeing Drive starts in 2nd gear. You would have to test it running in Sport mode to see if 1st is slipping.
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Old 08-07-2015, 10:19 AM   #27
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Sounds like a transmission problem.
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Old 08-07-2015, 11:25 AM   #28
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Well I'm pretty positive that the clutch had been dis engaged, that would explain the red line revving and lack any forward motion. Gonna swing by the dealer today to book my appointment.
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