Exhaust Leak - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 2 (permalink) Old 01-15-2019, 01:06 AM Thread Starter
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Join Date: May 2016
Location: Baltimore, Maryland
Posts: 134
Exhaust Leak

I recently installed an exhaust manifold and 2 days later I am now getting a P0171 about my fuel system beung lean and then a 02 Sensor being stuck/bias. Im wondering if the bolts are loose but im not sure. Any suggestions? I also kind of have a rough idle and the car smells a little funny.

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2010 Chevy Cobalt LT: K&N Air Intake, removed chevy emblem on the back, blacked out the chevy bowtie upfront, Red LED Underglow, '08+ FE5 Struts/Shocks, Eibach Pro-kit Lowering Springs.
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post #2 of 2 (permalink) Old 01-16-2019, 03:18 PM
Join Date: Mar 2017
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look for signs of exhaust leaking (black soot) from any of the flanges and was the manifold replaced with a new one or a used? bad o2 sensor? rough idle can be caused by the lean condition so double check and make sure the exhaust is sealed up properly - you can spray around with soapy water and look for bubbles also
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