Ok guys, i think ive pushed a little too hard on the Cobalt. This afternoon it finally pushed back. I was driving on the highway, showing my girlfriend my nitrous set up. Hit it a few times, nothin bad happened. Hit it a last time, car sputtered for a second and the check engine light was flashing on and off. I pulled over, pulled out all the spark plugs just to check em, The 4th cylinder spark plug electrode was bent all the way up. No gap. I had no clue what was going on. I start the car, It idles perfect and drives perfect at low rpms. If i get on it at all it starts to misfire but eventually catches itself and drives smooth again. Went to autozone, bought new plugs, put em in. Car started up fine, drove away and boom, misfiring again. Go back to autozone, pull the plug and get the code scanned, its a 4th cylinder misfire. The plug was smashed up again, with no gap. Who can help me, i have no clue what to do. Im thinking about taking everything off my car, and going to the dealership. But im trifecta tuned and i think they would just void my warrenty. Any techs out there have any advice?

 

Sounds like it's time to flash back to stock and take it to the dealer. I think they would check the ecu, but I doubt they would investigate if it's stock tune. I'm surprised you still have your warranty, how long have you had it?

 

ruh ro
that does not sound good
maybe something floating aroudn in there??? id think it had to be something that is physically hitting the plug...like a piece of valve???? that would also cause a misfire if it was a chipped valve or something...

 

Sounds like you need to drain the oil and see what's floating around. I bet you have aluminum shavings come out.

 

i agree
something isnt happy at all
and DONT keep running it like
be safe and get it looked at ASAP cause if it is something in the cyl, and its not covered by warranty...pulling it all off SUCKS and if the cyl gets fucked your looking at a FULL engine overhaul...

 

Why would it only hit the 4th cylinder if it was something floating around?

Serious question, I'm dumb with this stuff.

 

Is the only way to flash it back to stock throught trifecta?

 

ya...or the dealer lol

cause each cyl is serate in full, from where it splits in the intake to the collector in the exhaust its all seperated into the four cyl
just cause something in one fails, doesnt mean all of them will

 

If any of you people wonder why you have legit warranty claims denied, thank amateur racers like these guys.

 

Lol, pay to play?

Even if you flash it back to stock, they will see it was flashed.

 

I could be wrong, but someone told me Vince's tunes don't cause much problem. I think he said he has never had a case where they voided their warranty with his tune.

 

Amateur racers like us? How the **** do u come off calling me an amateur racer. Why wouldnt i try to get this done on warrenty work.

 

true, i was the beta test car and (not due to the tune) i blew up my tranny and had it replaced on warranty, all they did was flash it back to stock...BUT after that is when they released that they are going to be looking for aftermarket tunes and internals problems coupled with nos could cause a problem....

 

GM now sponsoring your racing career? I didn't think so. If you broke, you fix it. Stealing parts and labor from GM is for no skill theives.

 

Because it's your dumb ass fault for breaking it? Not GM's?

 

agreed with both of the above posts ^^

 

agree with the above post that agrees with the two previous posts.

 

ok...back on topic


to your problem

 

For some better advice....

You'll more than likely be pulling the head. You'll need replacement or upgraded head bolts/studs and a head gasket. If the piston is shot you might need machine work on the sleeve but I doubt it if its still running. You may need a new piston. You can upgrade all of them now or purchase a replacement stocker from the parts counter along with rings.

You'll also need a few adhesives and tools as well, all cheap and easy to find at a local parts store. These include but are not limited to a torque angle meter, black rtv, engine assembly lube, ring grinder, feeler gauge, plastigage and a torque wrench or two. A factory service manual will help greatly.

You could also have a decent engine builder do the same. This is all assuming you have a problem with the bottom end, which by the description you gave, you may have.

 

heh, run a compression test, see what the numbers look like. Change your oil. Thats not a bad place to start.

 

For some of the shitty repair work they've done on my car, I don't feel bad at all.

 

Sorry but i have to agree, that if you modify your car to the point of nitrous or forced induction, then blow up the engine, you should NOT expect to have it covered under warranty. I understand your thinking, but as someone said before, you pay to play...
Your dealership now has the ability to look at the last 10 ecu flashes, they can determine if your pcm has been flashed by a non gm tune. My advice is, IF you take it to the dealer, be honest with what you have done with it and see how they treat you, you may be suprised. They may also void your warranty!!! Hope not but that's the risk you take

Sentry, i think you just went to the wrong dealership.. We're all not idiots, just a select 90%,lol....

 

under warranty my engine was replaced @ 27 due to the crankshaft being overpun and cracking the fourth rod at 7,5k. the tools even missed it the first time and replaced the entire head but the bitch still gave out with the bottomend blowing out down the e-way. my car was modded and went to the deal like so. the service advisor knew i was hard on her but he understood my respect for my car, and my **** got fixed. gl, bro i hope the best and i agree on the compression test. if you need a hand get at me.

p.s. yeah and that **** happened to a na 2.2 auto

 

by law they still have to prove its cause of the parts or mods youve done

 

I think they could make the case that the shot of N2O blew the engine. But, good luck.