New disgusted corvette owner. Just bought pre owned. 2008 c6 17,000 miles on odo from reputable chevy dealer, Wich was obviously well maintained clean carfax / with good maintenance records . Ran incredible for 48 hours. Now after some spirited driving and and some hard acceleration while testing paddles with a couple of shifting mistakes,Paddle shifting WAS clean no lag and no harshness.Hasn't been floored nor been over 5000 rpms.here's the problem .Problem is now there noticeably slower acceleration from automatic driving with delay in shifting, lag and not as powerfull have to put peddle down half way with either no response or no powerband just slow steady acceleration like a v6 feeling.2 days ago it would of rocketed from same exact throttle depressing.Problem number two paddle shifting acceleration is noticeably slower with delayed response in gear changing and harshness not awfull but noticeably harsher. Down shifting is kind of harsh and jerking. What happened.?

 

Beats me, but I'd suggest you not play with it but rather take it to a place that can check if it's throwing codes. What it sounds like to me (at least in other cars, I am new to GM) is that you are in limp home mode.

Alternatively, try re booting the car. I'm sure there are instructions here or in your manual to do that.

 

I've read here - take off one battery post, and wait 10 min and then reconnect to reboot...try it! AND let us know what happens...

 

Remember To re-index your windows as per your manual

 

I would read the codes before disconnecting the battery, most auto parts stores can read the codes for you.

 

Thanks for the quick replys guys. Im brand new to the vette world so forgive my not knowing nothing. Im gonna bring it in to chevy before even enjoying it for only a ridiculous 2 days.What is limp home mode, theres no warning lihgts on how could there be a code? Just want some knowledge so dealer dont jack me around. More trouble info: when i slow down almost to a stop before taking a sharp turn as i take turn just as i begin to accelerate again theres a slight knock and delay in acceleration sounds a little clunky. #2 on highway engine tone seems to drop to a low hum like like its in nuetral or like it stalled and just coasting. Have to press gas peddle down about an inch to get weak throttle response .#3 Weather its in paddle or auto gear changes are delayed with slight knock .Wouldnt this indicate transmission problem. Once again first two days of ownership gear changing was perfect and smooth as silk with normal potent acceleration and no knocking. It feels clunky with lag out of the blue. I up shifted with paddles while rpms where coming down a couple times and down shifted to much once . Would that be the cause. This all started after using paddles. I would really appreciate any thoughts or ideas, for im very upset disgusted and stressing over my dream car becoming a nightmare as soon as i buy it, i waited 40 yrs for this , frigging heart broken .

 

You can search this forum about limp home mode. It's a state allowing you to get home under greatly reduced power in case of a significant component failure. That failure is most likely the TPS.

The noise you hear may be drive train play.

Since you've decided to see a dealer, you should get an answer soon. If you are worried about dealer honesty, either see another or an indie or get a code scanner and find out the codes yourself. That way you can determine if the dealer is telling you truly what your issue(s) is/are.

My Toy Taco bought used blew its TPS on the way home from the dealer - maybe 8 miles total ownership. Even though the sale was as is, the dealer replaced the part for free.

S happens.

 

Take it back to the dealership. Let us know how they handle it. Did they give you any kind of warranty?

 

If you "just bought" it,you should have some kind of warranty on it from the feds which covers powertrain.Bring it in and have them take a look.You can also call CHUCK COW,a tuner/vendor on here and have him give your car a tune that from what I hear and read,will not only snap your neck,it will remove you hair!!

 

I would go to an Autozone or Advance auto parts store first and borrow their code reader and check for any codes, scanning the codes is easy and they will assist if your not sure how to do it. Another thought i would check for a loose spark plug connection, maybe one came loose and your not getting a good connection at the plug, that would also give you the symptons you describe also an easy thing to check and it may save you a trip to the dealer.

 

If there is no light on,there will be no codes.Unless the dealer turned off the light before you bought it then something might be stored.

 

I agree...take it back to the dealer pronto. As has been said, it could be as serious as the TPS (Throttle Position Sensor), as simple as a loose spark plug wire...or maybe you floated the lifters on a paddle downshift . In any event, three days after the sale, the dealer should stand behind what they sold.
Good luck.

 

Yes i got 30 day from The dealer and 3 yr that i paid 2k for GM warranty . Onstar said theres no codes. Would knocking into gear and irregular shifting patterns indicate transmission problem /accompanied with noticeable power loss, tone of motor fluctuates abnormally especially when changing gears with delay. Its going in Tuesday after memorial day. Im sure service will start the typical (uumm sir we cant find anything wrong with your car and we cant simulate the problem you described sir) just watch. And they changed apr when i wasnt looking. Im so digusted . There messin with the wrong bull. Ill update later this week.P.S. Is drivetrain part of transmission ? The knocking is very troubling

 

Thats for your support, whats a toy taco? How would tps take a dump soon ? Whats the shift knocking then ?

 

I've only seen something like this occur a long long time ago with other vehicles.

- One old car I had of which was running just fine all the sudden one day decided to lose half of its acceleration power and would shake and hesitate. Discovered a spark plug wire was burnt up because it was making contact with the surface of a hot engine. Replaced wire, problem solved.

- My friends vehicle had the same issues. Turned out of be a mass airflow sensor. But he ended up replacing the computer module as well.

I'd first check spark plug wires, make sure nothing looks loose or burnt. Make sure the gas tank has some good gas in it, because who knows what might have been poured into the tank by the dealer. When the dealer delivered my corvette, they filled it up with 87 octane!! The first drive I took in the car, it knocked! Had me very worried. Had to drive through a half-tank before filling with 93, and the knock disappeared. I was very relieved.

If the simple obvious items checkout OK, then I'd take it in. It might be some obscure sensor somewhere in the engine that's giving the computer a bad signal causing it to make bizarre constant adjustments with ignition timing and shifting.

 

Toy Taco is a Toyota Tacoma - a compact pickup truck.

Not hearing the shift knocking makes it tough but like I say, it could be driveline play.

As to how the TPS dies so quickly, all items have a bit of trauma when ownership passes. Like two days after I moved in here, the water main broke after having been in service for over 60 years. Why? Nobody can say but machines are alive and so need to adjust to new owneship is my guess.

 

If it was working fine initially, I'm pretty sure you have an issue that is easily fixable. As others have already mentioned, it could be the TPS, Mass air flow Sensor, or a spark plug or wire that is off or bad.
FYI, the transmission is part of the drivetrain, so your Extended warranty would cover it.
BTW, your shifting with the paddles had nothing to do with your issues. I did the very same thing when I was getting used to the paddles. There is a safeguard in the system that won't allow over revving.
The other possibility is overheating. Check out this thread
https://www.corvetteforum.com/forums...eat-issue.html
Hopefully the dealer will find the problem and fix it to 100% satisfaction.

Good Luck

 

You double posted this problem a couple days ago, so I'm sure it's OK to repeat my reply on this one and add a little more.

Assuming the dealer recently filled the gas tank and you used up slightly over a half tank by now, it's possible the fuel in the second tank was bad from sitting unused for a long time. It's also possible the previous owner never drove it hard enough or used good fuel and the carbon buildup just now broke loose. These are issues common to low mileage and garage queen cars, however just let the dealer fix it.

But first I'd go WOT well into 3rd gear in S mode without touching the paddles. Record the time to get to 100, so you have a baseline to know the difference after the dealer fixes the problem. If you can't get to 100 in less than 15 seconds, it's a pretty big problem. Normal is in the 10-11 second range.

I'm not sure I understand what you call "spirited driving and and some hard acceleration", when you also say it "Hasn't been floored nor been over 5000 rpms". "Ran incredible for 48 hours" and "2 days ago it would of rocketed from same exact throttle depressing" are statements that indicate you're not aware of the potential. If you truly think what you did at part throttle and low RPM was hard acceleration, then I retract my previous suggestion in the interest of your safety.

Personally, if this had happened to me, I would have taken the car back to the dealer last Thursday morning, rather than posting here and waiting until next week. When you take it back, don't even try to explain the problem, except saying it has poor acceleration. Just simply ask the service guy to drive it around the block with you. He'll understand.

 

Before the wrong bull (you) go charging into the dealership, get a positive attitude and tell them the acceleration seems sluggish, it knocks, and ask them to road test it...preferably with you in the car.
P.S. The transmission is part of the drivetrain, not the other way around.

 

Like has been said, it's probably an easy fix. The car is 7 years old with only 17K miles so it was nearly a garage queen. Take her in, tell the dealer, and they'll take care of you. You've got a warranty, so all will be well.