[cwebster]

Originally Posted by travislambert

Here you go:
http://www.camaro6.com/forums/showpo...5&postcount=48

Thanks Travis. I didn't see that thread in previous searches. Was that a fan belt squealing I heard? It didn't look like your tires were spinning. Your clutch was disengaged, right?

I've had this happen when I was in front of a school dropping off kids. You should have seen all the ugly stares I got from parents, teachers, and the resource officer. I puttered out of there hoping it wouldn't happen again.

[travislambert]

Originally Posted by cwebster

Thanks Travis. I didn't see that thread in previous searches. Was that a fan belt squealing I heard? It didn't look like your tires were spinning. Your clutch was disengaged, right?

I've had this happen when I was in front of a school dropping off kids. You should have seen all the ugly stares I got from parents, teachers, and the resource officer. I puttered out of there hoping it wouldn't happen again.

I'm not exactly sure what squeal you are referring to. At the time when the car revved up by itself, I think the squeal was someone else doing a short burnout. The clutch was mostly disengaged (if not all the way). I was inching forward at the time, so I think I was feathering it.

This incident was certainly embarrassing too. The guy motioning for me to pull up probably thought I was a jackass. The same exact thing happened the day before on the NCM track. A track worker motioned for me to pull forward slowly. The car suddenly revved while I was right beside of the guy. He shot me the WTF are you doing look. I didn't bother explaining.

I've personally only ever had this happen while in track mode. Inching forward slowly seems to have something to do with what triggers it. Rev Matching was not enabled.

My theory on this is GM has already determined that the problem only occurs when the clutch is disengaged, so they aren't bothering with a fix. (This is just a guess)

GM is not big on spending money to fix problems for customer satisfaction...as evidenced by the refusal to improve the car's ability to launch.

[cwebster]

Originally Posted by travislambert

I'm not exactly sure what squeal you are referring to. At the time when the car revved up by itself, I think the squeal was someone else doing a short burnout. The clutch was mostly disengaged (if not all the way). I was inching forward at the time, so I think I was feathering it.

This incident was certainly embarrassing too. The guy motioning for me to pull up probably thought I was a jackass. The same exact thing happened the day before on the NCM track. A track worker motioned for me to pull forward slowly. The car suddenly revved while I was right beside of the guy. He shot me the WTF are you doing look. I didn't bother explaining.

I've personally only ever had this happen while in track mode. Inching forward slowly seems to have something to do with what triggers it. Rev Matching was not enabled.

My theory on this is GM has already determined that the problem only occurs when the clutch is disengaged, so they aren't bothering with a fix. (This is just a guess)

GM is not big on spending money to fix problems for customer satisfaction...as evidenced by the refusal to improve the car's ability to launch.

I'm going to try to get it to happen again, then release the clutch and see what happens. Same place I recorded this PDR would be ideal. That parking lot turns onto an empty road with a little sand at the entrance. It's pretty normal for someone to inch forward at a stop sign. I'll be ready to wrangle the steering wheel to avoid hitting something - foot near the brake pedal just in case. If it goes wild it will be easy to project what might happen if people and cars were nearby. That kind of evidence is hard to ignore. Maybe it'll just stall or stop accelerating.

[gblaue]

Originally Posted by cwebster

Thanks Travis. I didn't see that thread in previous searches. Was that a fan belt squealing I heard? It didn't look like your tires were spinning. Your clutch was disengaged, right?

I've had this happen when I was in front of a school dropping off kids. You should have seen all the ugly stares I got from parents, teachers, and the resource officer. I puttered out of there hoping it wouldn't happen again.

Twice in a McDonald’s drive through, once in front of a cop, and once when I was picking the car up from the service department. I dropped off, and they couldn’t duplicate it. I walk out to my car, and start backing out of the parking space, and vroom. A guy sitting on a bench outside crapped his pants. I get out of the car to go see if they heard it inside of dealership, and the guy on the bench asks me wth that was about. I told him it did all by itself. Naturally,inside they heard nothing, but the guy on the bench went in to vouch for what happened.

[Can'tHave2MuchHP]

Originally Posted by gblaue

Twice in a McDonald’s drive through, once in front of a cop, and once when I was picking the car up from the service department. I dropped off, and they couldn’t duplicate it. I walk out to my car, and start backing out of the parking space, and vroom. A guy sitting on a bench outside crapped his pants. I get out of the car to go see if they heard it inside of dealership, and the guy on the bench asks me wth that was about. I told him it did all by itself. Naturally,inside they heard nothing, but the guy on the bench went in to vouch for what happened.

Damn that's pretty frequent.

As far as replicating it for a dealership...Even if you do get them to hear it, what are they supposed to do? It's not going to be fixable by a tech.

[gblaue]

Originally Posted by Can'tHave2MuchHP

Damn that's pretty frequent.

As far as replicating it for a dealership...Even if you do get them to hear it, what are they supposed to do? It's not going to be fixable by a tech.

Agreed, but that is best was to provide feedback to GM.

[cwebster]

Originally Posted by gblaue

Agreed, but that is best was to provide feedback to GM.

+1
Although the dealership is unlikely to notify GM on their own, it does provide a paper trail and proof if GM needs to validate these claims.

[Android42019]

Ive had this happen a couple times but ONLY with rev match enabled. Happened at midnight pulling into our driveway lmao.

[cwebster]

Originally Posted by Android42019

Ive had this happen a couple times but ONLY with rev match enabled. Happened at midnight pulling into our driveway lmao.

What drive mode and PTM mode were you in? I've only been able to reproduce it in drive mode "Track" and PTM mode "Race". Never had rev match enabled.

Because of the behavior and conditions under which this happens, I think this issue is most likely related to "anti-stall programming" (ECM) as Squach put it in his post on pg 5 of this thread: 2017 zl1 reving up by itself (post 59)

--Cal

[Fraxum]

Originally Posted by cwebster

I know how you feel man. Lots of us are upset about getting a ZL1 M6 that was less than what we expected. I was hoping for sort of a modern version of the original 1969 ZL-1 except that it had all that famous GM engineering behind it in the bottom-up redesign.

My first annoyance was that the clunky Tremec 6060 was basically a slightly modified version of my '14 SS. I was hoping for smooth synchros like I had in my '70 Nova SS Muncie M22 4-speed "Rock Crusher". Didn't even need to use the clutch to shift that sucker.

My single largest disappointment was the intrusive, debilitating, built-in bog they're calling the Manual Transmission Protection "feature" (aka Torque Management). It really took the air out of my sails. They could at least give me the option of electing out of the transmission warranty. A configurable torque management system could let us dial-in the amount of torque we need. If it breaks then the tranny repair would be on us. As it is now, folks are modifying ECM parameters and voiding the entire warranty. They like to say it's to protect the clutch but, like brake pads and tires, that's normal wear-and-tear, not covered under warranty anyway. Let me burn up my clutch if I want, right?

The GT500 is a nice car but I don't think I'll divorce Chevy over this just yet. I'm not ruling out selling my M6 when I'm done squeezing all the performance I can out if it stock. On the other hand, maybe by this time next year I'll nix the warranty and do a major Weapon-X upgrade.

--Cal

So Cal, would you (or anyone else?) now choose the A10 if you had it to do over again? I am on the fence.....

I just don't want to regret buying the M6 or the A10.

[cwebster]

Originally Posted by Fraxum

So Cal, would you (or anyone else?) now choose the A10 if you had it to do over again? I am on the fence.....

I just don't want to regret buying the M6 or the A10.

To be honest, I would still buy an M6. I probably would have just waited and bought a used one, hoping they'd work the bugs out eventually. I'd love to drive an A10 but I believe I'd be bored with it once I'd figured out how to get the most out of it. I've always favored manual transmissions. To me, it's not a "real" muscle car unless I have to do some work to go fast. I really do love rowing through the gears. I just wish they had matched the gear box to the rest of the car like they did in the old days. My '70 Nova SS 396 was a perfectly matched machine. They should have spent a little time developing an updated 6-speed Muncie Rock Crusher like they did for the magnificent A10.

--Cal

[L98 Z28]

I've had my M6 LT4 rev by itself many times, usually with Rev Matching off and in Tour or Sport mode. There's a thread here on Camaro6 about LT4 Boost Bypass Valve Adjustment. I checked and my bypass set screw was screwed pretty far in. I backed it out about 1/2 a turn which made a noticeable difference in throttle response. I'm wondering if there any connection between the revving issue and lots of bypass and if others that have self-revving issues also have too much boost bypass as well. Anyone with a self-revving LT4 want to check their bypass set screw and report back?

[ZL1 1LE]

Originally Posted by L98 Z28

I've had my M6 LT4 rev by itself many times, usually with Rev Matching off and in Tour or Sport mode. There's a thread here on Camaro6 about LT4 Boost Bypass Valve Adjustment. I checked and my bypass set screw was screwed pretty far in. I backed it out about 1/2 a turn which made a noticeable difference in throttle response. I'm wondering if there any connection between the revving issue and lots of bypass and if others that have self-revving issues also have too much boost bypass as well. Anyone with a self-revving LT4 want to check their bypass set screw and report back?

I’d still like to see what the factory adjustment specs are for this.

[cwebster]

I finally found out what would happen if I let out the clutch during one of these runaway throttle episodes. Just pulling out of my driveway Saturday and it started to build RPMs after I bumped the throttle. It was early and nobody was out so I waited for it to get to about 3000 RPM let the clutch out. All it did was settle back to normal idle and putted down the street. Unfortunately, I didn't have the PDR running at the time.

The good news is that it's not likely going to be a safety issue. Bad news is that, because it's not a safety issue, it's not likely to be fixed.

Anyway, I'm not going to worry about it anymore.

--Cal