Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Quadrajet going WOT

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Cliff Ruggles:
I have checked the springs on the secondaries and they all look in tact and function just fine when manually opening the secondaries as well as allowing the engine to pull them open etc.

The double spring arrangement is on the outer portion of the secondary throttle shaft.  It was used to make the secondaries mechanically actuated by the link coming back from the primary side. 

The engine doesn't pull them open, and if it does, the outer spring is broken or not wound correctly.  It gets wound almost a full turn and the free end is help in place by an indent on the linkage at the 1 oclock position.

Don't waste any time or funds on "commercially remanfactured" units, spend it on the one you have now.

The only good sound the late model offshore die cast Holley's make around here, is when they "tink" off the dumpster outside the shop.  The quality on them has dropped to a level so low, we woln't even allow them in the shop......Cliff

ChrisK7und:
Thanks for your time Cliff, I do appreciate it.  I did take the Edelbrock QJet off and put the Holley on and so far it is running WAY better than my QJet ever did new.  It makes me wonder if the QJet was just not modified for any kind of performance engine even though it was sold that way.  The Holley is working well so far.  However, if I have to go a different route, what do you suggest in the way of rebuilding a QJet?  I tried once and was not happy with my work.  I would prefer to have one built by somebody that knows what they are doing and have it built to work with my ZZ4 350.  It has 10:1 compression with a performance camshaft.  The Quadrajet just never felt like it had any kind of pull when getting into it.  The moment I put the Holley on and took it out I was grinning ear to ear as my ZZ4 has never had the stones like it does now.....

Cliff Ruggles:
Unless you had an Edelbrock 1910, it was emission calibrated, like all other q-jets. 

Holley carburetors are NOT emission calibrated, and very generous with idle fuel and fuel curves.  This makes them pretty popular and one will almost always see improvement in power production initially.  After they start acting up, and emptying the wallet with high fuel consumption, the "new" wears off, and the owner usually starts looking for a better set-up.  Those designs simply are NOT very fuel  efficient  at light throttle openings (normal driving range), and tend to use a LOT of fuel.  Having at least a dozen places to leak below the fuel level, they also tend to develope problems early in life. 

I went thru that learning curve back in the 1970's, figured out how to go faster with factory carburetors, and NEVER looked back.

Anyhow, once correctly set-up exactly for the application, the Q-jet will run equally as well as the Holley everywhere, and get better fuel economy as well.....Cliff

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