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Old 12-28-2012, 01:06 PM
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Cracked Exhaust Manifold

So i Have an 06 2.2l 2dr automatic trans cobalt. All stock except k&n filter. Car has 193000 on it. Great car! I am a some what competent diy er with all hand tools but thats about it. Currently having issues with #1 cylinder miss fire, and catalyst system below threshold. started with plugs cause it needed it no help read up on here other stuff to try-cleaned throttle body(was very dirty but cleaned up easy),checked compression 165,170,170,165, no vacuum leaks or intake leaks, found cracked stock exhaust manifold. Also o2 sensor #1 is an odd looking shape like it has gotten way too hot! So my questions are #1 does anyone have a stock 2.2l exhaust manifold w/o a crack in it they want to get rid of? #2 is this whats causing #1 to miss fire? #3 did crack in manifold melt front o2 sensor or do i have other issues? Car is running good slight decrease in mpg no overheating or any other problems that i can tell. i have a scan tool and can watch my o2 sensors live data. Both front and back sensors are jumpy (indicative of a bad cat) but am wondering if all is from the cracked exhaust manifold and bad o2 sensor(the one that looks kinda melted) throwing everything off? Any help is greatly appreciated. Hope its not a bad cat too im in Ca. and dont even want to know how much new cat is.
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Old 12-28-2012, 01:42 PM
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Where in ca are u?
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Old 12-28-2012, 02:39 PM
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Yes, if the crack is close to the block the knock sensor can detect the noise and change timing which might account for lower mpg. This will also give you cat inefficiency codes if not all the exhaust flows through the HO2's
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Old 12-28-2012, 04:00 PM
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Up in the mountains kinda by Lake Tahoe off of hwy. 395 little town called walker CA. Thanks Coby7 I forgot to mention it is a noticeable miss at idle when cold. After 45 min drive it goes away. Won't always throw a code though.backfires when it misses. My take is ecm getting lean signal from ho2 in turn dumping too much gas for #1. Maybe #1 injector has something stuck in it cause its at end of fuel rail w/no return?
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Old 12-28-2012, 04:33 PM
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Does a lsj header fit a l61 dp
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Old 12-28-2012, 04:36 PM
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i think all the cobalts are the same as long as its not turbo it should fit

Last edited by Coby7; 12-29-2012 at 10:37 AM.
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Old 12-28-2012, 04:41 PM
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I'm going to be getting a lsj header and zzp dp but I want to keep the stock dp for smog but if the stock dp will bolt up to the lsj header and pass smog I can get rid of the l61 header. Any thoughts?????
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Old 12-28-2012, 04:46 PM
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are u auto or stick and do you have sai

Last edited by 09cobalt 2.2; 12-28-2012 at 04:50 PM.
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Old 12-28-2012, 05:02 PM
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Auto and yes sai. But you can tune sai out with hptuners and still be smog legal?
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Old 12-28-2012, 05:09 PM
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Ya im pretty sure all the same except turbo. Im auto.
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