Re: {Chrysler 300} Spark Plugs NKG XR5

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

They look perfect to me , but not iridium , (?) go for iridium much wider heat range stay clean at idle without hi load  / hi speed  preignition . I would  not go hotter , could hurt engine  , detonation 

Why they are in most high end Japanese cars , better emissions  due to better ignition at the plug across a wide range . An engineered thing , worth the small $ more .  

On Oct 1, 2024, at 12:43 PM, 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:



About 24 months back we had a long exchange on the subject of spark plugs.

 

The 300K has been idling a little off lately and sometimes feeling like it is dropping a cylinder. I pulled the spark plugs for the first time in 24 months, and they did not look all that good. I had noted that the idle felt better after a freeway run.

 

I have had people following me up and down some big hills on the highway and asked them to note if there was any blow by on hard acceleration or speeding up and them pulling out (high vacuum) going downhill. Nothing in either case. No noticeable blowby or suck by on the engine. 

 

You can see the photos of the plugs.  I suspect that I may need to go one more step hotter as these are not burning off.

 

Take a look at the photos and tell me what you think.

 

James

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