Well if it was headgasket it wouldnt blow the dip stick it would have side effects with coolant and what do you mean by piston #4 blowing?

 

I'm gonna go out on a limb here, its either head gasket, #4 took a ****, or intake manifold gasket (which is a common problem on our cars)

But do the leakdown and compression tests!

 

where doing compression tomororw

 

people are having a problem (im one) over boosting there head and causing the head gasket to give and at the same time the dip stick shoots out and sprays about 2 liters of engine oil...on ur engine..lol

 

Wow these cobalts are weird i wish they mad more power my last 240sx made 335 on 16psi with turbo and injectors and a tune my new engine build will do over 600 with about 2000 in upgradeing cobalts are hard to make good power with

 

No, you wouldn't. It would depend on the damage. Boyfriend blew #4 and it ran fine for WELL over 2 weeks minus the dipstick popping out. Then out of nowhere it idled like a boxer engine. No coolant in the oil or vice versa. Nothing to indicate a blown pison except for significantly lower compression on cyl 4.

A head gasket will most definitely blow the dipstick.


What did the logs look like? What readings were you seeing on your wideband? Getting any KR? You can go back and pull the logs that the tuner took while it was on the dyno and see if there were abnormalities.

 

oooops pow surprise! what were the people who were shitty tuners telling you

 

ok yall i did a compression test and the numbers at 165,170,175,180 is that good???

 

what tested 165? which piston?

 

Eh, the 165 is a little low. But from those numbers it's PROBABLY not a blown head gasket.

Did you do a wet test on the piston that showed 165 (I'm guessing #1?)????

The absolute BEST test you can do right now is to do a leakdown test to find out exactly where the problem is.

If you do a wet test and it raises the compression on the 165 piston, do a leakdown on it. If you can hear air out the dipstick - you nuked a piston or ring. If you get bubbles in the coolant, then it's a headgasket.

 

I have personaly never blown the dipstick out of the car, but it's either two things like people on here are saying.

1. Fried a piston ring
2. Intake Manifold gasket needs to be replaced

I have however, blown a headgasket on this car and it took a few days for the full effect to happen.

1. Coolant will start disappearing from the overflow bottle
2. All of the sudden when the headgasket really goes, your exhaust will bellow white smoke like crazy and it'll smell horrible.

Get a leak down test done, and don't drive the car until you fix the issue! If it's just fried piston ring and the cylinder wall isn't destroyed you can have it honed and replaced. If you keep driving the car, you could possibly destory the cylinder wall requiring a new sleeve to be pressed in or even destroy the block. The first is a lot cheaper than the second, so please heed this advise.

Finally, A/F ratios of 12.5:1 are a no go for these cars unless you have methanol injection. I already said this before, but I'll say it again 11.6-11.8 is the safe/happy zone for these cars. I just pray that it's an intake manifold gasket for your sake, but that compression test isn't looking to good right now.

 

It could be the o ring on the dipstick, i blew mine out a couple of weeks ago and im on a stage 2 tune seeing 10s in my afr on my wideband sometimes so...........

 

06_ss_sc, is your sig my headlights???? lolz

 

yeah thats what i thought it was... so i replaced them and no problems yet

 

I would still replace your intake manifold gasket w/ the upgraded one. It's well worth the 45 minutes and $30 it takes to do. I would retune it to within 11.4-11.8 AFR also...

P.S. - Why do you still have 272/260 in your sig? I thought you put 268/247...

 

Good indication that your rings are going is everytime you go WOT or often enough you blow out your dipstick. Your issue might not be the dipstick because you are running awfully lean.

 

hahah no they are mine.

 

depends on your definition of lean

 

My definition of lean=12.5 at WOT.

 

10s are a far cry from 12.5 though. I really really doubt his is just a dipstick issue. As a matter of fact, if it was my car I think that would be the last thing I would consider as tighter o-rings or some other temporary solution is only going to mask the real problem if there is one. A leakdown test right now is probably the best option.

 

hmm. guess im lean then

 

Area, you don't count. You have your own style all together! You could say that your in a league of your own too!

My scardy pants likes my 11.6-11.8 and my minute 21* on my meth! What can I say... I wish I had more power!

 

You have meth he doesnt.

 

true enough. i have run 12.3 afr without it before. ::shrugs::

2k5. my winter tune is 11.6 afr right now. i don't feel the need to lug around the lap top with me everywhere i go.

 

I vote piston rings. I cant believe the LSJ doesnt have a crank breather!