Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Where to start?

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JimC:
The 81 had EEC type chip and distributor.  The thing merely detects engine knock and the retards the timing.  The good thing is that the carb has no solenoids or switches.  I have a Mallory(Summit brand)  distributor an MSD box and MSD Blaster 2 coil now.  I experimented with various configurations of the HEI, but the MSD setup gave me the best fuel economy. 

Everything I have ever read, says the Q-jet works best off-road and on.


Thanks,

Jim

Cliff Ruggles:
Jim, the 1980's Chevrolet carburetors are excellent, and exactly what Edelbrock used as a base-line for their 1910 "850" cfm high performance quadrajet.  The last chapter in our book should be used to custom tune the later non ECM controlled units with the single main airbleed design.

Any of those carburetors will make as much or more power than the Holley carburetors, and be a LOT more reliable in long term service.  They are also a much more efficient design, so expect superior off idle throttle response,  improved fuel economy and overall driveability......Cliff

JimC:
Thanks for all the info.  One thing I have not found yet is what size were the main well plugs tapped?  I found what the smaller plugs were, but not the larger ones.

My Edelbrock 2101 will have to come out of mothballs and be cleaned and setup for the Q-jet.

Thanks again Cliff and others.

Jim

Cliff Ruggles:
Jim, all of the factory bottom plugs were pressed in aluminum or lead.  They did not use threaded plugs.

We recomend the pressure test as outlined in our book, and then tapping the castings and installing screw in plugs if needed.  We have the correct screw in plugs available separetely from our rebuild kits.  The casting will need to be tapped to accept them.....Cliff

JimC:
Thanks Cliff.  I do appreciate it.


Jim

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