well i was driving with a friend who hadnt ridden in my car yet and did a quick run up to 110. shifting from 3rd to 4th the car stalled hard and i couldnt get it to start again. so i had it towed to the dealership.

got the call today. blew a hole in piston #4. so far the minimum price to fix from them is a bit over 2 grand considering no damage to the sleeve or other parts.

looks like its going to be sitting for a longggg time until i can save up enough for a rebuild. it was fun while it lasted...

 

seems like alot of cobalts are going down lately wether its a crash or blown

 

yea it really sucks. idk i thot the motor could take it because it wasnt an extreme amount of power and the tune from term was really good. dealer said it was from "over-revving". kinda surprising since my redline is only at 7k and i have only taken it up to there maybe a few times...

 

Hmmmm not any of my cobalts have ever blew.. Prob because i do free revisions... But gay. And if you can work on a car u can easily find a lnf shipped to u for 1700 car-parts.com i bought my block from a junk yard off that website for like 700$ with crank rods and pistons and i sleeved it aNd built it....

Its prob from kr. Whwn was the last time u got revised

 

what are my chances that only the piston is toast and i can just install a new set?

oh and i got tuned only a couple months ago. 0 KR, maybe term can chime in

 

idk what it is but i agree with you completely, its sad to hear but at the same time, that means cheap parts for me

 

I'd guess not likely, the sleeve has to have some damage.

 

A couple months ago was cold. So therefor your fuel trim will be off. ....

 

it was about a 25 degree difference. u really have to retune every few months or you run the risk of blowing your motor? wow u learn something every day

 

No i recommend a revising when temps change dramastically. . Like i tuned my car last jan and i sent my tuner off in march to hawaii. Well i got it back about 5 days ago so i relogged and revised. My car was off -16 and +12 in areas lol so i recommend it.

 

well it was a difference of about 20F max. so every winter and summer get a revised tune?

 

Yes sir...

 

sheesh, wish i would have known...

well the valve is mangled too so its going to be a while before its rebuilt.

what pistons and valvetrain do you guys recommend?

 

i know... hopefully its not too long til shes back up and running

 

Sucks losing it.. I know how you feel. :/

 

how many miles did you have?

 

this was a nls im guessing you missed

 

It is not that trust me. It was not that cold when I tuned him. His timing is very conservative considering he has meth injection and a GT2871 turbo at 24 psi. All things considered his tune was far from super agresssive but the car pulled very well with no KR and 0.0 LTFT and STFTs with 1-2% everywhere. When he brought me the car it was knocking on 21-22 psi and it had +12% STFTs at WOT. When I was done the STFTs at WOT were -1 to 0.

 

Sounds like it leaned out. If the hole is in the middle and it was melted not broken it may only need new pistons/rings and a nice cylinder hone.

 

All part of the fun unfortunately, can never tell when these will happen sometimes! GL with getting it back together

 

this motor was probably hurt for awhile on the crappy previous tune

 

Sorry I have to call BS. fuel trims on a properly dialed in MAF will not be off that much from summer to winter. My car is normally within 2-3% from 20* to 100*. These cars do not need retunes every time the weather changes that is why we have 2 maps, a MAF and a closed loop PE that corrects. These are not carburated cars.

 

time to build! tow it home and tear her down

 

My tune and engine have survived in temps from -42F to +108F and at elevations from 0 - 8000ft
The computer has maps to compensate for all of these conditions assuming that they actually tuned the car properly and fully.

 

i have never nls'd once while owning the car. im pretty sure it was a burned hole in the piston, they didnt clarify. i will find out more later when the engine is actually taken apart. if the piston and rings are the only thing needing to be replaced, then she should be up and running soon. ill keep you guys updated