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Cylinder #2 misfire 2007 300 3.5l touring

  #1  
Old 04-17-2018, 08:17 AM
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Default Cylinder #2 misfire 2007 300 3.5l touring

So I have a cylinder 2 misfire happening. I have tried a bunch to fix it. New coils, plugs, fuel injector, timing belt, crank position sensor, cam position sensor, egr valve and gaskets, new plenum gasket, new battery, alternator tested good. Has good spark. Fuel getting to injector. Can't find any vacuum leaks. P0302 only code. Any ideas to what I'm missing?? Think it is valves?? It has a slightly rough idle and hesitation when starting to accelerate. But when accelerating harder it is fine. Any input appreciated.
 
  #2  
Old 04-17-2018, 08:36 AM
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A compression test would tell you if a valve train problem or rings/piston. How is the cooling system working(blown head gasket???
 
  #3  
Old 04-17-2018, 08:39 AM
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Originally Posted by REBEL59 View Post
A compression test would tell you if a valve train problem or rings/piston. How is the cooling system working(blown head gasket???
I will do that next. Thanks! No cooling loss. And never over heats. Did have oil loss over time. Thought was the pcv valve which was plugged. Replaced that. I will check the compression next
 
  #4  
Old 04-17-2018, 08:55 AM
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That motor is known to consume oil. A minimum of 110 psi on that #2 cyl. and it should fire for either possibility offered. Next step would be to try swapping a coil and see if the misfire moves to a different cylinder(bad coil), if not then a wiring problem to #2 coil or injector.
Many folks will call my next suggestion "blasphemy", But on many high mileage motors that I have had that oil cons. was fairly high I have tried and use Lucas brand oil stop leak. AND it works, my best example is our 122k 09 Kia Spectra 2.0 motor. Went from a quart every 1200 to 6 ounces in 2500 miles! Even in the COLD(Buffalo) NY area, NO problems from it's use!
 
  #5  
Old 04-17-2018, 11:48 AM
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Also check for any moisture at all in the spark plug well. Even just a few drops can cause a misfire on that cylinder.
I had that happen a couple of years ago with a 3.5 liter hemi.
The moisture ionizes and causes a short at the plug.

WD/40 and a paper towel is a good way to clear it out. it only takes a couple of drops of moisture to cause it.
 
  #6  
Old 04-25-2018, 09:12 PM
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Default Dry commpresion test results

So got the dry test done and here are the results.
passenger bank 1,3,5 all 152. Driver side 2,4,6 180,179,180.
A 15.6 % difference between banks. What would cause the two sides to be off by 30 psi??
 
  #7  
Old 04-26-2018, 06:05 AM
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Without a "wet test" it is probably from the piston rings and hence your oil consumption. NOT particularly bad and not the cause of misfire. I would proceed with the other suggestions already given.
 
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