My issue was the little tube from the accelerator pump was plug.

Great video. On the carbs that have the crossover ports in the primarys could you use them as well?

Olá

how do you properly adjust the set screw for the metering rods ? I also follow your thermoquad group on facebook

Will a international 345 work on a dodge 318?

Would it be easy to make one of these a manual choke?

So I adjusted my air door exactly like you said, exactly how you did. It’s a 318 bored .030 over with a 340 six pack cam and 340 heads. You said if you have cams in them add another 1/4-1/2 turn, which would make it 2 turns in my case. It still stumbles when you go to open the throttle. My choke pull off passes the test. What else could it be? It fires right up and idles good. Just stumbles when you go to open the 4 barrels.

My thermoquad as fitted to '83 dodge truck is losing fuel in bowl after several days sitting - would love to know/see how to tackle how and where this is draining ie known drain leaks-thanks

I just rebuilt the one on my '80's Gran Fury 318 and now it runs better than it ever has. Just hit the key, hot or cold start fires right off. I've always used the 2 screwdriver method too, but I did have that tool somewhere. You have to be really careful though, if you just loosen the jam nut that spring unwinds so fast it'll land in the bowl and you gotta take the top off. I need to adjust mine. It's too tight. Some of those emission era carbs were set at 2 1/2 turns or higher. I had a '79 300 and I think that one ran good at 2 turns. The one on my Fury has the 'tamper proof' choke pull-off box so it's a real late one. I've found the biggest thing with these carbs is the 'X' rings that seal the body to the wells deteriorate, sometimes the epoxied wells crack or get loose and they're really sensitive to the float level. I used to have a ton of these carbs. 10 years ago you could buy these all day long for a song. I bought some NOS ones for under $100. A great carb.

Uh....that's 3/4 turn, not 1-1/2, you're counting a half turn, as a full turn

I just rebuilt my first and now it bogs under a load. Will this tip help in my case? Thanks.

Interesting to see people using the old TQ carb. I worked at Carter till 1980 and was the first assembly line inspector on the TQ. I always thought it was an interesting and very simple design...Funny story, a local parts shop called Carter and asked how much the TQ sold for, as he was offered several for sale. This was before any had even shipped to chrysler, and the "for sale" units had been lowered from the 3rd story assembly line and spirited away by thieves...

Excellent description of operation and basic trouble shooting of the secondaries operation.

loved it....remember the little rubber eraser called TECH

working on one of these. need help!

Just got one 1.5 primary its getting rebuilt by.agood rebilder all American carb throwing all holleys away

You need to open the fuel idle circuit & the air bleed at the same time. If you only open the fuel circuit the carb will run rich. It's kind of a guessing game how much but the air bleed needs to be enlarged a bit more than the fuel circuit.

The thermoquad works very similar to a quadra jet. That spring tension has a factory pre set value that is on the rebuild sheet or in the factory shop manual. The secondary air valve opens at a specific rate depending on the bleed down rate of a vacuum diaphragm on the opposite side of the carb from the pre load spring. The manifold vacuum holds the secondary air valve closed by way of this diaphragm. If you doubt this just try to open the air valve while the engine is idling, provided the diaphragm is not ruptured. You can force the valve open but it is difficult. There is a built in restriction in either the diaphragm itself or in the vacuum port that the diaphragm is connected to. I have several of those thermoquads & some have it one way some another. That method of air valve adjustment will work but it is kind of a quick down & dirty way of doing it. Additionally the extra spring tension will mess up the fuel metering at wide open throttle. A ruptured diaphragm is the most common cause of the bog situation. Simply check it with a vacuum pump & see if it will hold the valve closed. There is a very good instruction manual on the quadra jet by a guy Named Cliff Ruggles & he explains the function quite well. It is worth the cost.

Good stuff. I am learning a lot.

Great info. Thanks for sharing.

I have had a few tq carbs i didnt know they had those adjustments I am going to find one and tinker with it thanks for the vid

Nice timeline !! I had heard of some on IH and Fords but never seen one actually.

There will be more...