I have a major situation after fixing all the damage from the accident with that semi truck tire. I fixed all the damage (visibly). But have 2 error Codes Being throw at me from the obd2. First error code is nothing important as i know my key is a bit fuked up p1614. The Second One is P0300 i guess it has something to do with misfires. The situation at hand is When i tryed to turn on the car the other day it came on but it was billowing smoke into the air from the Exhaust thick white smoke. Then the next day it wont even turn on. It is beyond messed up . I thought it was a blown head gasket i opened it to see nothing wrong With the plenum gasket. What other gaskets are their. And where are they located. Secondly who has a good tutorial on spark plugs uninstall / Reinstall. I wanna know what it could possibly be going on. Is it injectors Coils or Plugs thanks if you have any info.its killing the life outta me

 

YOu are talking about a G35 or J35? This is a G35 forum.

There are lots of gaskets, too many to be simply pointing them all out to you. It sounds like you have no clue to what you are doing.

Do yourself a favor and take it to a mechanic. If you want to change the spark plugs do a search and you'll see there are 100's of DIY and tutorials of how to fix and change things on this car. There is also a FSM (factory service manual) available in PDF for download for free.
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as in my exhaust is spraying mad white smoke but it is just major amounts of smoke i opened it didnt see damage it was pretty much just a bunch of smoke it is coming out of the exhaust and bubbles are coming out of the radiator . i pretty much am out of money and looking for a infiniti tech that can let me know if there are some "tell tell" factors to a problem it is major money and wanna know what it takes to get ther g back on the road.

 

backfire/misfires are to my knowledge usually caused by bad plugs/coils, or coils being out of firing order..change ur plugs with iridiums,they come pre gapped..and check your firing sequence..your coils should be number matched.