I see a gasket on the spark plug. At least in the 57 Service Manual it clearly states in bold “No gaskets are used on double rocker shaft engines.” You should check your 56 manual. The gasket will damage the spark plug tube. Better check the new spark plugs you put in as well as the tubes. Henry From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of BRIAN WALKER
Sent: Monday, 14 August 2023 4:41 AM
To: Henry Schleimer; 'John Grady'; 'John Cote'
Cc: 'Justin I'; 'ridgleyracing65'; 'Chrysler 300 Club International'
Subject: Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH Hello everyone and thanks for all the insightful suggestions. The solution ended up being a simple one, changing out my spark plugs. Something I should've done anyway and probably long ago. See attached pic for how bad of shape they were in. Yesterday I tested my 300B on the highway & it shot up to 85 mph like a rocket!
Another thing easily checked is your vacuum advance. As you say this happens with throttle input, that’s when you get vacuum change. First put a vacuum gauge on the line from the carb and see that the vacuum changes when the engine is revved. Then apply a had held vacuum pump to the canister and watch for proper timing change as the vacuum increases. I know you said the distributor was gone over but a sticking vacuum advance will give those sorts of symptoms. Best of luck. Henry really good suggestion ! I forgot about all that . new ones are truly junk if they have a black robber cone on end , a stamped in X or stamped line on other end . It is supposed to hold aluminum foil against the aluminum case inside by pressing in . The design is a sad brutally incompetent joke. Gets intermittent contact due to aluminum oxide .You can’t touch aluminum together and expect a connection Skip , poor running comes and goes . Hard start etc . This drove me crazy for years , finally one day I had exact same issue on Kohler flat twin emergency plant , sometimes no start . . After cutting one open —— that one day it tested good another day bad , (open) i saw where it had been arcing , not even sealed . I’d say good for under a year ,total junk . I got so into it big time ; I mounted panasonic radio quality capacitors instead , .27 uF 630V as you can’t find good automotive ones .All about making it in China for 5 cents. The Panasonic are epoxy sealed , Japanese quality control . By the way , all interchange . People routinely throw out really good old mopar hermetically sealed ones with the copper strap , replace with chinese junk with the rubber cone. Private branded , as part of “ tune up “ Check cap with highest scale ohmmeter analog , needle swings up settles at infinity it is good don’t change out as “ part of time up” unless bad . I have never seen a bad mopar with copper strap ,or blue streak with strap either . watch for them on ebay , I found 10 one time . Failing to understand this leads to changing plug wires plugs and coil , each makes it better for a month , as spark is on edge weak (sometimes ) due to poor contact inside the cap Try changing just the condenser in distributor. Same symptoms you have. Worked for me and ran without stumbles after changing. Easy to try before going down rabbit hole. 🤔 I am still having the opposite problem: stumbling with throttle input from any speed. Distributor/timing, fuel... all gone over. Wondering if it could be slack in timing chain... ? Maybe the harmonic balancer has slipped and is no longer reading accurate time, but runs nice once the stumbling clears. Hard starts when warm, but I think that's just heat soak; not necessarily a related issue.
Brian: If you know the exhaust is good, then I am back with the other members pointing toward a fuel supply issue. On Sunday, August 6, 2023 at 5:08:56 PM UTC-5 bwalk05 wrote: The exhaust & mufflers were some of the first things I replaced. So both are brand new. Subject: {Chrysler 300} Re: 300B Stumbling at 60+ MPH
This has all the indications of a partially plugged exhaust system. How old is the exhaust and mufflers? Car idles and runs great up to the point the exhaust restriction just stops the performance. I have seen this exact same thing before.
On Saturday, August 5, 2023 at 11:15:03 AM UTC-5 bwalk05 wrote: Hello Everyone, Anyone have any suggestions for troubleshooting Carter adjustments (or otherwise) for a car that stumbles beyond 60 mph. It starts up fine, idles smooth, accelerates strong up to 60 mph and then stumbles...even at fully open throttle. I suspect there is an accelerator pump issue or secondary is not opening under vacuum. Any thoughts/suggestions would be greatly appreciated!
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