P0300 Multi Misfire - Need Diagnostic Help

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texasqx4
Posts: 31
Joined: Thu Mar 26, 2009 7:49 pm
Car: 2016 QX60 2WD
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I have a P0300 Multi Misfire DTC on my 2001 QX4 265K+ miles. Prior to new parts installed and after I received the same code. I just replaced the injectors, coil packs, spark plugs, PCV valve and Intake gaskets which are all supposed to be potential causes for P0300. I also installed new Valve Timing Solenoids.

I also now have a P0365 Knock sensor left bank that is new after the part replacements above.

Anyone have any suggestions on how to diagnose the P0300 problem further or a fix beyond what I e already replaced?


fleurys
Posts: 324
Joined: Fri Apr 16, 2010 10:00 pm
Car: 2001 Pathfinder , Locked and loaded !
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After reading what you have changed, I'm thinking your intake is not seated properly and letting air come in... If I were you , just to confirm that it is not the case, I would perform a smoke test from the intake.. You can get the basic idea from here .. https://www.youtube.com/watch?v=c9toNCNWf20


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