1968 Deville Convertible - Thundermingo or no go

Trouble shooting running issues with my Amazon carb before the 30 day warranty expires. I'm having trouble getting the secondary's to open and with power at full throttle. Let me know what you think.

[@rosewd2]

For dieseling check the anti-diesel dashpot on the carb, idle, timing and carbon in the combustion chambers - heads have to come off to clean it out. I had a 67 deville 429, and a 72 with a 472.

[@aalabbasi]

Thank you. All good advice. So you think the carb is good?

[@rosewd2]

@@aalabbasi
make sure the throttle shaft isnt bent. back the idle screw in all the way and check that both primary plates close. make sure nothing is leaking from the plugs in the center above the base plate. other than that the carb won't make it desiel. that dashpot thing tends to go bad, check thats its cheap. but hot carbon in the chambers will do it too. Are all the plugs burning clean - light tan ?
use the correct plugs, not one hotter.

[@cav4290]

Top tip: Use a cheap endoscope to see if you have(excessive) carbon build, note "excessive", as it will invariably always have some carbon.
Then, go get ride of carbon, use a very special chemical: H2O. Rev the engine up and spray water into the intake.

[@GamingWerk]

We're you able to permanently fix the secondary problem? I just bought the same carb a few days ago and I'm having the exact same issues

[@aalabbasi]

Unfortunately no, I am sending it back and have just ordered an edelbrock 1411. I'll make an update shortly.

[@aalabbasi]

@Project Thunderbird - I put the 1411 on and it solved all my problems.