RE: {Chrysler 300} Rear Plugs Fouling

["dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx" <dplotkin@xxxxxxxxxxxxxxxxxxxxxxxxx>]

Your valve stem seals are shot. My NY 440 had the same illness. The engine is tipped back naturally in the car so oil drains back at shutdown and down the valve stems it goes into the combustion chambers. 

 

I was changing plugs twice a season until I fixed it. Not a bad job. 

 

Danny Plotkin

-----Original Message-----
From: "Anthony Doughty" <62red300h@xxxxxxxxx>
Sent: Thursday, May 29, 2025 2:43pm
To: "Chrysler 300 Club Listserver" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Rear Plugs Fouling

After about 1000-1500 miles the rear plugs on both side of the 413 in my 300H start to carbon up and fire poorly. The other six plugs are fine.  The carbs have been overhauled, idle settings are shop manual correct, and the car runs really well until the carbon begins to interfere. Anyone have any thoughts or knowledge as to:

(a) why this might be happening and 

(b) how to fix it?

Thanks for any help and advice,

Tony Doughty

  

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