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

weird lsj problem? Any help welcomed!

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Old 04-26-2013, 10:56 AM
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Yeah since the car has sat so much it could be a rotted rubber vac line on your bypass
Old 04-26-2013, 11:42 AM
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Originally Posted by ls1fbody
Have you looked at all of your vacuum lines? I would check those before replacing the bypass. It's possible you have a leak. That or a s,all rodent creeped into your intake and is reducing your airflow pre-maf
i dont think its the vacuum lines, due to the car idles fine. and i took the bottom part of the airbox off, and it was clean, so ill check the pipe up on top.
Old 04-26-2013, 03:45 PM
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Originally Posted by SalvageBaltSS
i dont think its the vacuum lines, due to the car idles fine. and i took the bottom part of the airbox off, and it was clean, so ill check the pipe up on top.
You never know. If its the lines to the bypass valve, the car would still idle fine, as the default position is open. Under load (and vacuum) it closes the valve = boosties.

If your tires are dry rotting, I would not be surprised if your vacuum lines were as well.

And it probably isn't post-maf, because my tire used to rip off the lower intake above the maf all the time, and let me tell you, the car idles like a spooked horse with unmetered sir after the maf.

Cars are finicky, but I would say to replace all your vacuum lines to check for the problem. Cheap and easy, and it definitely won't hurt anything.
Old 04-26-2013, 04:51 PM
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Originally Posted by ls1fbody
You never know. If its the lines to the bypass valve, the car would still idle fine, as the default position is open. Under load (and vacuum) it closes the valve = boosties.

If your tires are dry rotting, I would not be surprised if your vacuum lines were as well.

And it probably isn't post-maf, because my tire used to rip off the lower intake above the maf all the time, and let me tell you, the car idles like a spooked horse with unmetered sir after the maf.

Cars are finicky, but I would say to replace all your vacuum lines to check for the problem. Cheap and easy, and it definitely won't hurt anything.
well turns out my lines are weather cracked, but im not sure if there leaking. dont fell any air, or anything. maybe under boost they are, cause it does go up to 4 lbs of boost, then probaly dies off.. but if this fixes it, thatd be great! And thanks for the info man! big help.
Old 04-26-2013, 06:35 PM
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Originally Posted by SalvageBaltSS
well turns out my lines are weather cracked, but im not sure if there leaking. dont fell any air, or anything. maybe under boost they are, cause it does go up to 4 lbs of boost, then probaly dies off.. but if this fixes it, thatd be great! And thanks for the info man! big help.
Well if that is the case man then chances are high you have pin holes and you won't see them, or feel them because they can be stupid tiny... Car runs like total ****! With bad or leaky vacuum hoses I hope this fixes your issue man..
Old 04-26-2013, 08:57 PM
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Originally Posted by SalvageBaltSS
well turns out my lines are weather cracked, but im not sure if there leaking. dont fell any air, or anything. maybe under boost they are, cause it does go up to 4 lbs of boost, then probaly dies off.. but if this fixes it, thatd be great! And thanks for the info man! big help.
You won't feel vacuum, because it's sucking air in. Especially when the holes are small.
Old 04-26-2013, 09:32 PM
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these are the lines you guys are talking about right?

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Old 04-27-2013, 12:41 AM
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Yep, they could very easily be leaking.

Be careful, those nipples break easily

Last edited by ls1fbody; 04-27-2013 at 12:41 AM. Reason: Automerged Doublepost
Old 04-27-2013, 12:52 AM
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Originally Posted by ls1fbody
Yep, they could very easily be leaking.

Be careful, those nipples break easily
alright. thanks man! if you weren't for you, I wouldn't have even looked at the vac lines. lol hope this does the trick!
Old 05-05-2013, 11:40 PM
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heres a update. I fixed my car with 4 dollars worth of vaccum line! I couldn't belive it! im boosting a steady 11lbs , and couldn't be happier lol thanks for all the input and help!
Old 05-05-2013, 11:56 PM
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Oh nice dude! U know its funny i replaced both those lines the other day because MY car was running like **** at idle lol! Still kinda does, thinking of replacing that thing on top of the m62 and whatever the other line goes to on the drivers side of the block... Just for good measure.
Old 05-05-2013, 11:56 PM
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Awesome! Glad it worked.

And to think you were ready to buy a new bypass valve!
Old 05-05-2013, 11:57 PM
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Originally Posted by riceburner
Oh nice dude! U know its funny i replaced both those lines the other day because MY car was running like **** at idle lol! Still kinda does, thinking of replacing that thing on top of the m62 and whatever the other line goes to on the drivers side of the block... Just for good measure.
The SCIP sensor?
Old 05-06-2013, 12:11 AM
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Old 05-06-2013, 12:16 AM
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Originally Posted by riceburner
Oh nice dude! U know its funny i replaced both those lines the other day because MY car was running like **** at idle lol! Still kinda does, thinking of replacing that thing on top of the m62 and whatever the other line goes to on the drivers side of the block... Just for good measure.
I cleaned my maf sensor, and throttle body, and my idle jumping around went away. so maybe that would fix the idle.
Old 05-06-2013, 12:18 AM
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is that pic of that sensor thing that the lines go to YOUR car. cause if so, why is it zip tied, and I looked at my car and its up on top, not under.
Old 05-06-2013, 12:34 AM
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We modified the coil pack harness to run a 2step and decided to put it there
Old 05-06-2013, 08:53 AM
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That's your EVAP purge solenoid, Rice.
I had a bouncey ass idle before I replaced that thing. I still gotta do some vacuum lines like you guys,

http://www.crateenginedepot.com/Coba...67-P17635.aspx
Old 05-06-2013, 12:02 PM
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I'm surprised the CEL didn't come back after u reset it. I thought a vacuum leak should always throw a code if there's a leak even if you clear it.
Old 05-06-2013, 12:51 PM
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Those cars are so goddamn nitpicky it's not even funny anymore. My bouncing idle came back so I'll probably change all the vacuum lines too.
Old 05-06-2013, 07:35 PM
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Originally Posted by SaberD
I'm surprised the CEL didn't come back after u reset it. I thought a vacuum leak should always throw a code if there's a leak even if you clear it.
nope. never came back on. Im glad it was a easy fix though lol
Old 05-06-2013, 08:02 PM
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Originally Posted by Gelladuga69
That's your EVAP purge solenoid, Rice.
I had a bouncey ass idle before I replaced that thing. I still gotta do some vacuum lines like you guys,

http://www.crateenginedepot.com/Coba...67-P17635.aspx
Thank you! Gonna replace that sucker just for peace of mind!
Old 05-07-2013, 03:18 PM
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Originally Posted by SS89
Those cars are so goddamn nitpicky it's not even funny anymore. My bouncing idle came back so I'll probably change all the vacuum lines too.
the vac lines are so cheap, its worth doing lol
Old 05-07-2013, 05:23 PM
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Originally Posted by SalvageBaltSS
the vac lines are so cheap, its worth doing lol
Where'd you get yours done, Vatozone?
Old 05-07-2013, 05:56 PM
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Originally Posted by Gelladuga69
Where'd you get yours done, Vatozone?
yup autozone. 4 feet for 4 bucks.


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