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misfire on bank 4

G

girty

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I have 122,000 miles on this genesis and was driving it and the engine light came on right after there was a exhaust rumble when i floored it due to the lack of power so i get the code read and it gives me misfire on bank 4 I order a new coil and plug for it and it now it runs like crap again but its not throwing any codes check other plugs and they are not fouled. any ideals on why this could be happening? what could possibly be the fix?
 
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Honestly sounds like what I went through when my catalytic converter was getting plugged up. There was way too much back pressure (exhaust couldn't flow to the tail pipe) so it was building up pressure and releasing through all the joints along the exhaust from the manifold to the cat.
At the time I had no CEL though. I removed the front 02 sensor and all the power came back. Replaced the cat and the car was good again.
It wasn't my Genesis but the systems are the same regarding exhaust and blocked cats. Might want to check that.
 
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