--Yep,
Unfortunately, my Sun Machine is buried right now or I would have run it on the car to see if I could ID where the hiccup is.
I will try a hotter plug, as the #7 NGK’s are on the cold end of the spectrum.
If that does not work then off to the vacuum chase.
James
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of RICK AND DEBBIE CLAPHAM
Sent: Tuesday, February 21, 2023 12:17
To: Ron Waters <ronbo97@xxxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} A Thanks to everyone.
Still using antique technology, last week found short firing voltage amplitude, and all plugs fouled. Poor gasoline caused problems, changed plugs this morning, Fresh fuel now. Happy now.
Sent from my Verizon, Samsung Galaxy smartphone
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From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> on behalf of Ron Waters <ronbo97@xxxxxxxxxxx>
Sent: Tuesday, February 21, 2023 11:39:49 AM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} A Thanks to everyone.
As Danny said, it sounds like a vacuum leak. But I would also recommend attaching a vacuum gauge to the intake and starting the car. The vacuum gauge is a great tool for diagnosing engine problems. It's like giving your engine a 'check up'. I also use one to time my engine.
There is lots of great information about this on YouTube, or just by doing a google search.
Ron
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of Dan Plotkin
Sent: Tuesday, February 21, 2023 11:56 AM
To: 'James Douglas'
Cc: chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: RE: {Chrysler 300} A Thanks to everyone.James-
Avoid firing a parts cannon at the car. Otherwise you may never know what was wrong or what fixed it. If you know all 8 plugs are firing use an IR temperature gun on the exhaust at each cylinder, see if you can find the cool one. Most rough idle are vacuum leak or leaks. You might go around the carb base and intake with an unlit but open bottle of propane or brake cleaner listening for a change.
Vacuum leaks. I hate ‘em.
Danny Plotkin
From: 'James Douglas' via Chrysler 300 Club International [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx]
Sent: Tuesday, February 21, 2023 11:51 AM
To: Chrysler 300 List Server (chrysler-300-club-international@xxxxxxxxxxxxxxxx) <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} A Thanks to everyone.
Hi All,
I wanted to take a moment and thank everyone for all the help over the last few months. We drive the 1964 300K down from our little house in Winters, CA (which has the garage with a lift) down to our San Francisco residence. The car ran fine. The only real issue is the PO put on an exhaust system that is so loud it is annoying. I need to either order a new system or find a good shop in Northern California that can-do first-class work.
The one important outstanding problem is that at idle the engine is rough. At first, I thought it was the carburetor. I swapped that out for newish Edelbrock and it did not change. I swapped out the Prestolite for a later orange box dizzy and it did not change. I put new wires on it and it did not change. Running out of ideas.
One thought I have is that I am using NGK plugs that are on the cold side (#7). I am going to swap in some #5 plugs which are hotter and see what I get.
Again, thanks all and over the next week we shall see if I can get it to settle down for city driving. On the freeway it hummed along. This will be the first week in 22 years that we have not relied on the 1947 Desoto.
Best, James
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