2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

PLEASE READ! May have cracked a piston!

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Old Jul 28, 2007 | 03:07 PM
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Lightbulb PLEASE READ! May have cracked a piston! Or sensor going bad?

Ok so my car was acting up last night before i went out to my friends party. As i was following them my car started to accelerate by itself in a way. I looked at the boost gauge and it was boosting 0psi instead of -20 when i had my foot completely off the gas. Then when i went about 1/4 throttle it went a little past 10psi which made no sense to me as i have to go at least 1/2 throttle to make the car boost. Then everytime i came to a stop the car would idle like absolute **** and would almost stall. It went from 2k rpms to 500rpms and kept going back and forth. Then when i leave normal from a light in 1st when i eased into the gas the car stopped moving for a second kinda like a misfire and then it was fine. When i tried going WOT off the bottle it would studder then go and on the 2-3 shift it would fall on its face . Then this is the weird part because as i was leaving my friends house the car was completely normal! I could go WOT without a problem i even sprayed the car on the highway and no signs of the other things i mentioned above. To me this is really strange and it makes so mad bc this **** always happens to me and i can never find an explanation to the problem. LJavy17 thinks i may have blew something internally like a piston. Im gonna go get a compression test done on my car this week to see if something is messed up in the engine. Hopefully its just the pistons because i can replace those with the Diamond ones in 2 weeks I just hope its nothing to serious or else im screwed Anyone of you guys that knows these cars please help me out by figuring out whats wrong with my lemon of a car!

Last edited by yellowcobaltss05; Jul 29, 2007 at 03:08 PM.
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Old Jul 28, 2007 | 06:37 PM
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did your dipstick pop? are you leaking coolant from anywhere?
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Old Jul 28, 2007 | 06:39 PM
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Originally Posted by yellowcobaltss05
Ok so my car was acting up last night before i went out to my friends party. As i was following them my car started to accelerate by itself in a way. I looked at the boost gauge and it was boosting 0psi instead of -20 when i had my foot completely off the gas. Then when i went about 1/4 throttle it went a little past 10psi which made no sense to me as i have to go at least 1/2 throttle to make the car boost. Then everytime i came to a stop the car would idle like absolute **** and would almost stall. It went from 2k rpms to 500rpms and kept going back and forth. Then when i leave normal from a light in 1st when i eased into the gas the car stopped moving for a second kinda like a misfire and then it was fine. When i tried going WOT off the bottle it would studder then go and on the 2-3 shift it would fall on its face . Then this is the weird part because as i was leaving my friends house the car was completely normal! I could go WOT without a problem i even sprayed the car on the highway and no signs of the other things i mentioned above. To me this is really strange and it makes so mad bc this **** always happens to me and i can never find an explanation to the problem. LJavy17 thinks i may have blew something internally like a piston. Im gonna go get a compression test done on my car this week to see if something is messed up in the engine. Hopefully its just the pistons because i can replace those with the Diamond ones in 2 weeks I just hope its nothing to serious or else im screwed Anyone of you guys that knows these cars please help me out by figuring out whats wrong with my lemon of a car!

how can you say that, when you have 60s? ... which you know is risky
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Old Jul 28, 2007 | 06:40 PM
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Man seriously, stop driving your car.
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Old Jul 28, 2007 | 06:41 PM
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its probably the piston, but you'll have to take the head off to be sure.
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Old Jul 28, 2007 | 06:41 PM
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damn... can't lemon a modded car man... and do some compression and leak down tests first, and why would you spray when you knew the car wasn't running right?
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Old Jul 28, 2007 | 06:42 PM
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Originally Posted by 06blackg85ss
damn... can't lemon a modded car man... and do some compression and leak down tests first, and why would you spray when you knew the car wasn't running right?
x2.

Compression test will tell you if you have a mechanical issue.
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Old Jul 28, 2007 | 06:42 PM
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Most people know when you blow your piston you usually feel like you hit the limter in your car when you have not a hic cup if you will. And sometimes the dipstick pops
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Old Jul 28, 2007 | 06:43 PM
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^^omg, i must have missed that.. were you thinking?
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Old Jul 28, 2007 | 06:43 PM
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Was the car tuned for the spary or were you running on a regular tune
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Old Jul 28, 2007 | 06:43 PM
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Originally Posted by 06blackg85ss
damn... can't lemon a modded car man... and do some compression and leak down tests first, and why would you spray when you knew the car wasn't running right?
what HE said...
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Old Jul 28, 2007 | 06:44 PM
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tune???? Because it was acting like **** then normal all of a sudden, just throwing **** out there
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Old Jul 28, 2007 | 06:47 PM
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Did you blow the dip stick out? Blow the oil fill cap off? Blow any seals and dump oil like mad? If you answered no to these then you don't have a blown piston.

With a cracked piston in an N/A car it blows oil out of the crankcase breather, and out the PCV tube. Add forced induction and it gets way worse!

You may have a problem but I don't see it being a cracked piston.
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Old Jul 28, 2007 | 06:49 PM
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Damn! And I was just thinking of doing the NOS after seeing your install pics in the past couple of days. So you think that may have anything to do with your current situation? Or was your car having any issues prior to the nos install?
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Old Jul 28, 2007 | 06:53 PM
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Could have blown a head gakset if you didn't retard timing when spraying. Theres a lot of possibilites here that a compression test can turn up.
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Old Jul 28, 2007 | 06:54 PM
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heh we have watched all the different things youve done/issues youve had with your car man.
I wish you the best of luck, but you cant really justify calling it a lemon.

Last edited by an0malous; Jul 28, 2007 at 07:19 PM.
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Old Jul 28, 2007 | 07:17 PM
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well said
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Old Jul 28, 2007 | 07:30 PM
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Originally Posted by yellowcobaltss05
whats wrong with my lemon of a car!
Well here's your problem right here.

Originally Posted by yellowcobaltss05
Magical tune by Ljavy17 o and a 50 shot of Zex :
I always rely on magical tunes too

Have you done any fuel delivery upgrades aside from the 60#'s??

Oh, and don't blame the car...
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Old Jul 28, 2007 | 07:33 PM
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check the TB and the O2 sensors...my car was running exactly the same and it turned out to be the throttle body and O2 sensor. dealer replaced them and it ran fine after.
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Old Jul 28, 2007 | 07:36 PM
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Originally Posted by an0malous
heh we have watched all the different things youve done/issues youve had with your car man.
I wish you the best of luck, but you cant really justify calling it a lemon.
x2 hope you figure it out and best of luck.
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Old Jul 28, 2007 | 07:51 PM
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Originally Posted by ecotecon18s
check the TB and the O2 sensors...my car was running exactly the same and it turned out to be the throttle body and O2 sensor. dealer replaced them and it ran fine after.
X2 Yea check the 02 sensors a while back my car started doing the same as well and I brought it to the Dealership and thats exactly what it was. Good luck with it.
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Old Jul 28, 2007 | 08:17 PM
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Did you get a CEL?

Do you have a interceptor gauge?
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Old Jul 29, 2007 | 01:25 AM
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i took delivery on my car 3 days ago and had the same problem with no upgrades
i ran the car for TSBs and there is a flash to correct the problem just go see your dealer, it recalibrates the throttle body so it wont affect you custom tune
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Old Jul 29, 2007 | 01:50 AM
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That happened to me once before (10k miles back) and never had it since. Just turned off the car for a couple of minuets and went back to normal. Damn electronic throttle bodies.
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Old Jul 29, 2007 | 02:13 AM
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Compression test is the best way to go. If all good, then you know it's gotta be a sensor.
Good Luck!!
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