M88ArRamadi

Well coming home from dropping my wife and son off at LAX I hit 20+psi and the balt shivered (studdered) at 6000 rpm's. The cobalt sounded like a big sleigh at Christmas. All types of flashing lights, bells, whistles, vibrations, and one hell of a smell. I got the following troubles all at the same time:

Low Coolant
Flashing CEL
P0300 Engine Misfire Detected
P0141 HO2S Heater Performance Sensor 2
P0068 Throttle Body Airflow Performance
P0101 Mass Air Flow (MAF) Sensor Performance

I've gotten the Low Coolant sign before when I installed Stage 4 w/2.5". I didn't think anything of it.... so i added coolant. Then about a month later I had the lean/misfires DTC's whe I had my airbox mod....so I got a 34-pull dino-tune to fix my AFR. almost a month later THIS!!

Well I went to the dealership and talked to my buddy that is the Cert. Tech. and he said I blew my head-gasket. There was oil and coolant coming out of the SC.

Now all I have is my wifes "***-wagon" (06 Suzuki Aero SX) The dealer think's it'll be a while before i get the balt back.

YellowLT

I regards to your Sig, there is a tunning for dummies book. Let me find mine and I'll give you the ISDN. Its not by dummies but it's a good book. Sorry about the balt

R&C_rallySS

Wow, sorry to hear that. That is why I am sticking with the GM kits and mods. I hope you took that intense off so maybe you can get thr work done under warnity. At any rate, good luck man.

M88ArRamadi

Yea everything is back to stock except the pulley (waiting for INTENSE pulley puller to come in the mail)

YSUsteven

They way those 2.0 rocks are built, when they blow they go BOOM!

JCswoosher2

so dealer will cover it?

M88ArRamadi

Yea they'll cover it if it's stock. I'll bring it to the dealer next week (waiting for pulley puller or new snout).

If anyone has of a SC snout laying around please PM me I neeed one BAAAADD. The only thing I am worried about is the machined snout I have now.

zinner

Hope you didn't crack a piston like several others have. Threads have started out head gasket and moved into I took the head of and the piston is cracked.

Where you seeing any knocking, what was your IAT2 with a 2.5?

JCswoosher2

seems to be the cool thing to do. CRACK A PISTON

NJHK

I'm sorry to hear about this but...

You can't be suprised because (and I'm going according to your signature), you have no aftercooler upgrades and you're running a 2.5" pulley which puts your M62 way out of it's efficiency range and you're creating more heat than power. I'm also going to assume that you don't have any type of gauges (especially a gauge to read your IATs), cause if you did, you would have probably wouldn't have had this happen to you.

Not ragging on you at all, as a matter of fact I feel sorry for you cause I'd hate to be in your position trying to convince the dealership that your car WAS stock and this amount of damage occured. I wish you luck though.

RaineMan

wow... I didn't know that many people were running the 2.5" pulley on a daily driver...

just seems like a bad idea all together.

Don't these things start to produce so much heat that any power gains are negated at a certain point?

NJHK

Yes without doing any type of cooling upgrades.

Imlikedrpepper

They are still able to see what has been pulled off the car and put back on

M88ArRamadi

I don't remember the IAT2 but knock was around 0*-4*.

I had problems with boost before but never like this. I'm at 2500ft and get 16-17.5 psi and when I was in LA I was at 19-21 psi right around sea level. I seemed to get a spike of boost before it vibrated/stuttered.

Also I've never drove the car that long (2+hours) with the 2.5"

Looks like I'll be ordering pistons, head gasket, and head studs if I can't get it covered under the warrenty.

djt81185

None of the cars I tuned have cooling upgrades. and we all run 2.5 with 0 problems...peronsally i believe these problems people are seeing are due to tuning and not having the proper tools to measure their engine VITALS. My opinion on the subject.

WopOnTour

https://www.cobaltss.net/forums/show...632#post581632
I would agree with this assessment

Wop

bdwarr6

my bet is you experianced detonation like i did, you most likely cracked the piston or ring, if this is the case let me know i have all the information you need if the dealer refuses to cover it.

so far ive spent 5300 fixing it will complete after market parts and im now owrking to tear the clutch out during my down time

zinner

He has the scan gauge, only other thing you need is AFR.

You can't run a 2.5 and not pay attention to the engine. Didn't GM upgrade the cooling on the GAC cars because they required it to stay cool under constant flogging

djt81185

Dude is that your actual AF ratio in the link?!

WTF was ur tuner thining....It should be 11.9ish under WOT not 14.7.

Reading over ur logic Its all wrong (not bashing)...adding flow mods makes ur AF higher by increasing flow...Anything u added over that tune just made u run leaner!

That is exactly why your motor blew...I'd go raise hell.

Dan

BTW Wop whatsup...havent seen u around in a while

Witt

Agreed, one dollar says its more than a blown head gasket. Whoever tuned your car disabled any type of power enrichment.

Halfcent

If you think you can bring pistons, studs, and gaskets to the dealer and have them install them for you under a warranty repair, you are mistaken.

The dealer will swap out stock parts for stock parts on a warranty. And that's it.

If you want pistons, studs, and a head gasket (which I highly recommend since you have to take the engine apart anyway), you will have to pay for it. Or do it yourself.

BTW, the christmas sleigh light show analogy is good. That's pretty much what my car was like when I dropped a valve.

Witt

Thats reason #2 why I've never used a warranty to have anything mechanical replaced. Replacing parts with the same type that have already broke ftl.

To the OP, obviously you're interested in modding the car to a higher level. Probably a good idea to look at a cometic gasket, golden eagle or ARP head studs, and a forged set of pistons and build that engine to take 100,000+ miles of abuse.

M88ArRamadi

Naa wasn't trying to say that. I was going to go back to stock and bring it back to the dealer and they would fix it under warrenty.

BUT....I was thinking...if I brought the car to the dealership and they somhow knew that I had other parts on it ....I'd be screwed and broke. If I just buy the parts and install them myself I'd just be broke. So I think I'm going to pull it.

HEY bdwarr6 I'll probably need some technical info. The more you can give me the better. I hope it's not over $5k in parts!!! ALL the work I can do minus machining.

bdwarr6

It depends if you want to go stock, or aftermarket. I have looked at both options and i will say its a bit more to go aftermarket but in myopinion well worth it

OEM Parts
88984129 cylinder sleeve, one per cylinder required.
90537691 cylinder head bolt, M11 x 1.5 x163, total of 10 required.
24407225 cylinder head bolt, M8 x 1.25 x 60, 4 required.
12595961 cylinder head gasket kit, less valve cover gasket. -- this is on backorder*****
93180138 piston ring kit, one per piston required.
12791210 one piston head
11519783 crankcase bolts - you need 20 you cant reuse stock ones

your going to need some marvel mystery oil to oil your pistons with when you go to replace them.
Piston ring compressor
18mm 16mm 15mm 14mm 13mm 12mm 11mm 10mm and 8mm sockets and wrenches
alot of plastic baggies to label what bolts go where

now if you want to go after market which i reccommend
get a cometic headgasket www.cometicgaskets.com
mahle or diamond pistons www.intense-racing.com www.cobaltperformanceparts.com
Golden eagle head studs www.lightingmotorspors.com

all in all to fix it it isnt bad i just bought about every toy you can for the balt i figured i would do it and be in dept for it once

bdwarr6

its not to bad of work honestly you can do it with hand tools, 2 jacks, 2 jackstands and alot of time

i would higly reccomend a 3ton jack one of the big boys also will need an engine hoist if you want to do it my way which i will have some info about it soon