Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

My carb...

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Shark Racer:
Could be retarded timing coupled with a significantly lean condition.

Freddiesbuick:
Lean condition perhaps, but the timing is at stock which is 15@BTDC.

Shark Racer:
Are you sure the balancer/timing chain are OK? Otherwise, 15* should be fine.

Cliff Ruggles:
Is your "parts" carb using a Buick turbo main casting and baseplate?.....Cliff

Freddiesbuick:
Those things are rare and I didn't want to spend the ridiculous money on the few left. So I modified the base plate I had of an 82 Buick Electronic carb. It's easy. I wish I could upload pics to show what I did. But there are no issues with the engine or timing since I'm just experimenting by backdating it. As it was before I began fiddling around with this hybrid carb I modded it runs beautifully, (it's a CCC system so it used the ECM controlled carb and HEI).

I backdated it to a vac controlled HEI and a non-CCC carb I got off of an 80 Pontiac. The APT now draws manifold vac not from the plenum but directly from the manifold. A three way check valve protects the APT from boost, (during boost the vac is drawn from the plenum).  8)

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