MikeyTX

I am of the firm belief that depending on where one lives has a lot to do with how the issues are or are not resolved. Some dealers are clueless, some zone reps are clueless. Worst case scenario, both are clueless. I for one, even though both my C7 Z06's have been issue free for the most part, am seriously looking at buying another CTS-V.

petepd

2017 Z06 A-8 purchased in May 2017. A/c works great. Vented seats work great. Whole car works great! (got an intermittent rattle behind passenger seat. THE OWNER OF THE DEALERSHIP WORKED ON FOR 2 HOURS, but the rattle came back.)

They made 6,272 Z06's in 2017, and here are about 15 guys with problems. Don't let it get to you.

DebRedZR1

you have to be in contact with the right people. Lucky my Dealership is good, not so good on the local rep BUT I by pass him for the guys at MPG

Ummmmm how many of those guys/GIRLS belong to the Forum, and/or post There are far more issues reported than those posted here.

Bill Dearborn

I have one intermittent performance issue with my 2015 Z06/Z07. Other than that it has been pretty much perfect. I have set personal best lap times at two different tracks and have never had to cut back on a track session due to over heating even when ambient temps were in the low 90s. Never tried running in ambient temps higher than that since it is too much abuse on me.

I did 4 track events at VIR from April through June of 2016 with no issues. During a July event at Watkins Glen the engine stopped developing peak power and became sluggish. Speeds at the end of the straights dropped at least 10 mph. PDR data showed coolant temps were in the mid 220s and oil temps were in the mid 270s which are far from over heating levels. There was no CEL or any messages on the DIC.

When I took the car to the dealership they could find nothing wrong. I did two more track events after that at VIR and CMP and had no issues.

In 2017 I did one event at VIR with no issues followed by another event at Watkins Glen. During the Glen event I set a personal best lap time of 2:05:81 on the first day. The second day went fine as well. On the third day the car suddenly stopped developing peak power during the last session of the event. The problem started on lap 3 and I told my rider the engine wasn't producing peak power and we were running slow on the straights. On lap 7 as we were going up through the Esses I felt the engine come alive again and we surged to normal speed at the end of the back straight. The car ran fine for the remainder of the session which was another 7 laps. Again there was no CEL or any messages on the DIC. PDR data showed nominal coolant and oil temps. When I took the car to the dealership this time the mechanic found a P0300 code which is a general misfire. A few days later I attended the NCM event at VIR and the issue came and went throughout the two days. Again, no CELs or DIC messages. I went back to VIR about 6 weeks later and set my personal best lap time of 2:04:87 and over the three days of the event the problem came and went. However, this time there was a CEL. The dealership mechanic found a misfire occurring on number 8 cylinder just above 5K rpm under full load (WOT). Coolant and oil temps were nominal. GM engineering recommended checking the charge cooler fill and making sure it was filled properly. The mechanic did this and showed me what he had done and how full the charge cooler had to be. I went back to VIR for a one day event after that and had the same issue with power going away and then coming back. This time there was no CEL but the mechanic did find another P0300 code that showed the primary misfire was on cylinder number 8, above 5K rpm at full load and that it had misfired 84 times. The results have been sent to GM engineering but haven't heard of a response yet. Not a big deal right now since the next track event isn't until the beginning of April.

Despite this issue I can truly say this car has been the most track capable Corvette I have owned. I tracked my 86 and it would over heat the oil even with the stock oil cooler installed, my 97 and 03Z would over heat the oil, trans and diff without aftermarket cooling solutions being added and the brakes had to be upgraded for better durability. The C6Z had all the cooling pieces required with coolant temps running in the mid 220s and oil temps running around 260 but it required aftermarket brake kits to be a true track car. The C7Z handles much better than my previous cars and I am setting personal best lap times getting through the slow part of the tracks much better than I did in my previous cars. Even when this intermittent power reduction occurs the car is still one of the fastest on the track. Yes, my speed on the straights is down by about 10 mph but my speed in the slower parts of the track is still at my limit not the car's limit. My best speed entering the uphill Esses at VIR is just short of 130 while others on this forum are entering at just short of 140 and the video of Jim Mero demonstrating the handling improvement of the updated handling software was just short of 150. The power reduction might keep me from reaching 150 if I had the ability to drive the Esses that fast but it wouldn't restrict me from upping the entry speed another 10 mph. It will take more seat time on my part to get there.

As for the general track capability of the car at all of the track events that I have attended with this car I have never met a C7Z owner who over heated at that same track event.

Bill

DebRedZR1

Great info Bill! Thanks so much. Keep us posted what the General finds.

OnPoint

OP - do plan to put together a spreadsheet or summary of issues reported in the thread and keep it up to date?

Would be useful to see items that are one-off v. recurring issues on multiple cars, the latter of which would give an owner some useful knowledge about what to keep an eye on etc.

DebRedZR1

Yes, that is the plan as soon as I get some time to do

mikelj

Since I am considering ordering a new Z06 (yes Deb, replacing the '12 ZR1 CBM with the engine I built in it) and building the engine when that resumes, I find this tread very useful to research it. Thanks Deb!

DebRedZR1

Hi Mike, thanks so much Recall seeing your engine at PBC If you go through with it will be fun to hear about and comparisons of the two experiences.

mikelj

Thanks, I will be building something when it all gets up and running again, just not sure if it will an LT4 or an LT5. Stay tuned, I will review the experience one way or the other. I need to get hold of eaglei and see who he knows there. Cheers!

DebRedZR1

I miss Don's updates on the goings on at Wixom, the good ol days. He told me who had retired, transferred etc. My Builder Mike Priest last I heard transferred to BG

mikelj

I meet Mike when I was at Wixom, would be great to see some familiar faces.

orangecrushu

Just took advantage of all the incentives and traded my 2016 Z51 for a 2017 Z06 3lz. Waiting to pick it up because I found the quilted headliner was seperating from the roof.

Izzy1000

Although my 2016 ZO7 has had a few issues, like the engine blowing up at 5000 miles, I still love this car. I have generally owned 911s or M3s. It has never over heated but when it gets warm the ECM pulls the timing. I started to add a bottle of Octane booster and its has helped. The ECM timing is pulled about 50% of the time before I added the booster. After New Years I will have the GM 100 Octane calibration installed. At the track I always run 100 Octane. In Calif we have terrible 91 octane. Adding a can of the booster will get it to about 94 or 95 Octane. Just enough for the new Calibration. When the timing is at the right number the car pulls like a beast. ENJOY THE CAR

Larry Bittner

I had to work with the Exec Referral office to get the replacement engine. Yesterday it was approved. After 3 weeks at the dealer it will be interesting to see how long it take to get the new engine and have it installed. Probably should have bought a Grand Sport for the track.

djnice

Did the engine break at the track or why should you have bought a GS?

JWingo

2016, M7 Z06 bought new. Transmission would not stay in gear. 460 miles it needed a new transmission.

Bought another:

2016, A8 Z06 bought with 1,400 miles. Torque convertor, stator support.

Izzy1000

I have a 2016 ZO7 M7. In the past month my trans kicked out of 1st gear a few times. Did your trans kick out of different gears or just one gear?

When I got the car the transmission was fantastic. During shifting it just slipped into gear. Every once in awhile I have to wiggle the gear into place. Mostly happening on down shifting into 1st or unshifting into second.
Does any of this sound familiar?

JWingo

Just first. I adjusted the shift box 5 times. Wasn't any correcting it. Called Tremec engineering and we decided it was most likely a slider. It shifted great! When stopped, let the clutch out and it's out of gear again. Once it just popped out of second.

Machonewon