2.0L LNF Performance Tech 260hp and 260 lb-ft of torque Turbocharged tuner version.

Something let go on the Cobalt tonight...

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Old 11-12-2016, 11:28 PM
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Unhappy Something let go on the Cobalt tonight...

No idea what it is and have no way of looking at it tonight. It made it home fine and makes no noise when reeving at a stand still only dose it when moving and under load. Have some buddies coming over tomorrow to help figure it out. Any ideas? Thinking its drivetrain.

I thought it was his car at first thats why it took me so long to let off.





Here you can hear it when I take off.

Old 11-12-2016, 11:32 PM
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Is it just a noise or is there a loss of power?
Old 11-12-2016, 11:37 PM
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Didn't feel a loss of power during the pull and haven't got into it since to find out.
Old 11-13-2016, 02:53 AM
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Lash adjuster?

or maybe it's vtec consitantly kicking on and off

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Old 11-13-2016, 06:51 AM
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What the heck is that?
Old 11-13-2016, 11:17 AM
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Idk whatever it is its very loud and only happens when i start to build power. Drove the car around the block last night it revs up fine i was able to slowly get it up to 4k rpm and nothing but as soon as I started to build power I heard it.
Old 11-13-2016, 11:51 AM
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Originally Posted by CaRRiED
Idk whatever it is its very loud and only happens when i start to build power. Drove the car around the block last night it revs up fine i was able to slowly get it up to 4k rpm and nothing but as soon as I started to build power I heard it.
Almost sounds like something in the suspension. You didn't break a trans or motor mount did you? Not a normal sounding motor problem.
Old 11-13-2016, 12:20 PM
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It honestly sounds like a spark cut, or blow out to me, but no loss of power seems fishy. Pretty gnarly noise tho.
Old 11-13-2016, 12:24 PM
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Originally Posted by Slowbalt2000
It honestly sounds like a spark cut, or blow out to me, but no loss of power seems fishy. Pretty gnarly noise tho.
It does remind me of a loud electrical pop. And after hearing what blowout sounds like if definitely sounds similar. And as far as power loss I really couldn't tell and i haven't tried since.
Old 11-13-2016, 03:58 PM
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Youre running e47. Sounds like injector seal went.
Old 11-13-2016, 04:32 PM
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Yeah That is what we are thinking. Going to be replacing them.
Old 11-13-2016, 05:33 PM
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aK-47 mod.
Old 11-13-2016, 07:44 PM
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ya if that doing it under load, that sound like injector seal. had it happen to me
Old 11-13-2016, 08:32 PM
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Originally Posted by tomj77
ya if that doing it under load, that sound like injector seal. had it happen to me
Yeah thought it may have been blow out but we logged it and didnt see anything. Went ahead and changed the plugs. Then my buddy said something about the seals, we looked into it and we are 99% sure thats the problem. Plus getting on here and seeing noss saying the same thing.

Last edited by CaRRiED; 11-13-2016 at 10:11 PM.
Old 11-13-2016, 10:35 PM
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Originally Posted by CaRRiED
Yeah thought it may have been blow out but we logged it and didnt see anything. Went ahead and changed the plugs. Then my buddy said something about the seals, we looked into it and we are 99% sure thats the problem. Plus getting on here and seeing noss saying the same thing.
watch misfire monitor while ur putting load on motor, that will tell you for sure and also which one is doing it
Old 11-13-2016, 11:01 PM
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May as well check and maybe clean intake valves while youre at it.




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