Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle and Perf Issues
77cruiser:
Just for yucks try about 20 initial.
RMA:
I did try up to about 16 degrees, (eyeball it Pointer stops at 14). Idle got worse. I could try again with a dial back light.
Cliff Ruggles:
Your main problem is the cam selection. Not enough compression for that much duration even in the big 455 engine.
It's going to want a LOT of idle fuel, bypass air and initial timing to be happy.
The exact same engine build at 10.5 to 1 compression would be making a LOT more vacuum and pretty happy with that cam, but even then it wouldn't be making a lot of vacuum at idle speed and still require some help from the carbs idle system to be ideal......
RMA:
Thank you for the feedback. Any suggestions on initial timing? Also, any ideas why the secondaries will not kick in? I have full travel on the throttle linkage. Thanks
RMA:
Bumped the initial timing to 20 she seems happier. Mixture screws out about 6 turns in park Idle is 750 and drive around 600 which is an improvement. Check on vacuum tomorrow. Hoping for better weather and take a drive. I appreciate all the feedback! Thank you.
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