Re: {Chrysler 300} Rear Plugs Fouling

measure resistance of plug wires , has to be less than 40000 ohms . Maybe someone pulled on wire broken inside .

slight chance some kind of off center looseness in distributor bearings impacting dwell on one side more than other

Points set not perfectly would add to impact of that

i really believe only way to tell dual points are perfect is the old Sears analog dwell meter

The points move as you tighten screw , feeler gauge is for dreamers . Been there long ago

Digital stuff leads you down garden path with erratic bad data ( looking at you , junk snap on dial back timing light ) . Caused me untold grief .

Finally , an old sears chrome light that connects to # 1 solidly with plug adapter solved all that . My friend Ed, had one his dad left behind . Pickup type modern timing guns WILL pick up other cylinders — sometimes

Both sears auto tools on ebay cheap

I cannot see how carb or mixture would only hit two rear cylinders , opposite side carbs ..

Vacuum leak would run lean ..

Compression check , but doubt motor trouble at back of both banks ?

let us know how you do . Could go up one step hotter in heat range , or iridium plugs

On May 29, 2025, at 2:43 PM, Anthony Doughty <62red300h@xxxxxxxxx> wrote:

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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