Hello, Mopar Forums!
I have a 1975 Plymouth Gran Fury Brougham with a 440 engine. I bought it in October 2014 for the right price, and it ran fantastically for the most part. It would get a bit boggy on my cool morning commute, but would warm up and be good to go all day. Then on one November day it would turn over and over but hardly fire. When it finally did, it was bogging worse than ever before, then stalled and would not start again at all. I have replaced ignition components (Distributor cap and rotor, plugs and wires, ballast resistor), set the timing, and just recently rebuilt the carb (the floats were not properly adjusted). At this point the car starts, idles a little low, and the choke stays half closed even when the weather is hot and it bogs down quite a lot in gear. The carburettor is a 4 barrel Carter thermoquad. My final guess is that the timing chain has maybe jumped. I hope that's not the case so I'm looking to you guys for any other theories. Any and all help is greatly appreciated, I miss driving my boat lol.

 

I would bet it is more likely to be a carb problem. With the engine off, check the fuel pump squirt . Check the plugs too !

 

Carb, plugs, fuel pump as stated. The fuel filter would be a good check too.

 

The plugs were caked with carbon deposit, cleaned them to the best of my ability, and that seemed to help a little bit further. The fuel pump is definitely doing its job, have yet to check that fuel filter though. Also tried to tinker with the carb adjustments. It now idles pretty smoothly, albeit high at the same time, but still gets boggy in gear. Especially in reverse, the engine shudders and shakes enough to register on the Richter scale. I can only do so much myself to tune that carb as this is the first car I have owned that's not fuel injected. Maybe I should plate it and take it for a cruise to see what happens?

 

snowy -

If you put a fuel gauge between the carb and the filter and get 5 - 7 pounds that should rule out any fuel obstruction.

The choke not fully opening doesn't sound right and with that the bogging is probably due to a rich mixture. Once you get it running, try to prop open the choke and see how she runs.

If the engine had any work done to it, I would suggest loosing the choke completely, with with a stock motor, it's debatable.

Archer