Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Marine 454 no throttle response between 3,000- 4,000

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7228Sedan:
It was a few years ago... I don't remember. But I will be sending you this unit in the off season for a professional clean up  8).

I just need to get it good enough for the fall Striper season!

I'm going to change out the primary rods to the 41 that were on the old carb, and check the float. I might pull the air valve spring off of the old carb as well and try it on the new carb for shoots & giggles... The old carb when it was good never had this issue. Who knows what the knuckle head used in the "re manufacturing".

Is there a rule of thumb measurement for the secondary throttle blades to open based on primary angle?

Cliff Ruggles:
I don't work on anything "remanufactured" or the Marine replacement units sold on Ebay.........lessons in humility.

I will work on any original Marine carburetor, and get it running FLAWLESSLY for what you are doing.  I've done thousands of them at this point and have learned to stay away from anything but the original Marine units........Cliff

7228Sedan:
Fair enough I guess... Can you point me in the right direction regarding my question on the secondary throttle blades? I still have the original carb, I'll send you that one for perfection :-)

Cliff Ruggles:
There were two different arms used to apply the secondaries.  Marine units will use the shorter one so they will come in sooner.  There really isn't much adjustment in the linkage as far as when they start.  Never measured it in degrees, but the baseplates that use the taller arm bring it in considerably later, which is beneficial for some applications, such as towing......Cliff

7228Sedan:
Thanks Cliff, I appreciate the expertise... I pulled off the carb and found that the base plate had a different linkage as you mention above, as well as replaced primary throttle plates.
Whomever "re manufactured" this carb was a real piece of work... the primary blades were too big and wouldn't allow them to close all the way. It's no wonder that I couldn't get the idle circuit to adjust. The primaries were open way too far even with the idle adjustment stop backed all the way out. I took the base plate off of my old carb and assembled a Frankenstein unit using parts form the original as well as the newer one.  Looks promising.. I'll keep you all posted.

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