RE: {Chrysler 300} I hope I did not buy an engine with a problem...

["Ron Waters" <ronbo97@xxxxxxxxxxx>]

 

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From: Ron Waters [mailto:ronbo97@xxxxxxxxxxx]
Sent: Wednesday, February 22, 2023 1:25 PM
To: 'James Douglas'
Subject: RE: {Chrysler 300} I hope I did not buy an engine with a problem...

James -

 

Fouled plugs means that you are burning too rich. Has nothing to do with hotter or colder spark plugs. It does sound like a vacuum leak. To compensate, the mixture has been richened to keep the car from stalling or running very rough, which results in the fouled plugs.

 

As I mentioned previously, put a vacuum gauge on the intake and it will likely point to where the problem is.

 

Ron

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From: 'James Douglas' via Chrysler 300 Club International [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx]
Sent: Wednesday, February 22, 2023 12:05 PM
To: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx)
Subject: {Chrysler 300} I hope I did not buy an engine with a problem...

I pulled the NGK plugs with a #7 heat range. They have about 200 miles on them. The number 1 plug, I had it out and I cleaned it, before I drove back to SF it was worse than the clean plugs but not as bad as the darkest ones in the photos.

 

As the photos show, some plugs show fouling. The engine is not producing smoke on acceleration or deceleration.

 

I put in new plugs with a #5 heat range (hotter) and will see what I get. The idle feels a little better, but not dead smooth.

 

Issues on both sides if you look at the photos. 

 

Next up is looking for vacuum leaks.

 

James

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