loud knocking constant with engine speed

[whatsmynameagain]

ok, so 1st post, hit 9k on accident on the intestate. Now the engine has lost power, engine is knocking loudly, and I think I can here a flapping noise too. Its the day b4 thanksgiving so im pretty sure I wont hear from the dealership until next week. No mods. So any thoughts?. Plz im upset and a little panicy. Do not want to drive my wifes veloster for the next however many weeks.

[Tcoat]

As much as I would like to reassure you it looks like you better resign yourself to driving the Veloster for a while.
There are a number of things you could have broke and none of them good.
Have to ask (and I don't somebody else will) how did you manage to hit 9K?

[tennisfreak]

Did you downshift to a gear you were going to fast for?

Its the only way I can think our car could hit 9k unmodified.

If so, uh oh, you may be screwed.

[civdaddy]

Mechanical over rev aka "the money shift". You probably bent some exhaust valves. At that rpm it's possible the valves can float and the piston can give them a good ol smack. I would start thinking about the best way to approach the situation. You don't wanna be a jerk to the service department because they don't have to cover that kind of damage under warranty.

[Ultramaroon]

Floated valves and bent at least one. At best valve job on one head.

edit: civdaddy beat me to it.

[civdaddy]

What did you tell the service department so far about what happened?

[FirestormFRS]

In the event you did bend a valve or 16 you can bet the piston(s) have at least nicks at worst cracks. I know they get tossed out where I work if there is the slightest damage to the piston. Future failure point.

[Ultramaroon]

Originally Posted by FirestormFRS

In the event you did bend a valve or 16 you can bet the piston(s) have at least nicks at worst cracks. I know they get tossed out where I work if there is the slightest damage to the piston. Future failure point.

Oh yeah, duh. I'm just going to take a seat over there and shut up now.

[jflogerzi]

How did you hit 9K. That is a major Over-Rev. Miss a shift did we....

[Reaper]

I've seen this. I know a guy who did the same thing. Bent 4 valves, cracked a piston and bent a rod. Goodbye engine. At least short blocks are less then 3k from subaru. Labors is going to be much more than that though.

[Koa]

bite the bullet and buy Anthony's used engine off here and throw it in yourself .. http://www.ft86club.com/forums/showthread.php?t=77957

.. sorry, these guys covered everything. condolences op, hope you get it sorted

[whatsmynameagain]

Yeah, it was cold. I had the heat on in traffic. My hands were sweating and slipped off the shifter in the middle of a 4th to 5th. So it went into 3rd instead.

[whatsmynameagain]

Im guessing warranty is non existant after they see data that says it hit 9k. But, my saving grace might be the fact that the warning light never came on. As a matter of fact the noise didnt start until like 10 minutes later. Then I got a low oil pressure light.

[Kevinn]

I mis shifted a 2011 Scion tC that I once had. Took it to the dealership, and told them it was making weird noises. They took the top of the engine apart and knew exactly what I did to it. Cost me a little over 7k to have the dealership repair it. Needed a new short block. Floated the valves also. Had to go through the whole break-in process after the repairs.

However, I have heard of dealerships covering over revved engines. Obviously the customer had to lie about what he knew. But most of the time the dealership isn't stupid.

For future reference... Palm the left side of the shifter knob when up shifting, Palm the right side of the shifter knob when down shifting. Less likely to hit the wrong gear.

Best case scenario, you need new exhaust valves. $1,800 to $3,500 repair out the door.

Worst case scenario, you bent/stretched some rods in the bottom end... ~$7,500 repair out the door.

You may be required to have the dealership make the repairs to retain the powertrain warranty. Also, they're most likely to do the repairs right as their top mechanics will be handling this.

Keep us updated on this whole process!