Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Idle Problem

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runnerguy:
Thanks for the advise Cliff. I will work on that in the next couple of days when I have time.  I will post again and let you know how it turned out. Your Quadrajet book is great, always learning something new every time I read through it.

Dave

runnerguy:
I had some time today to check out the Secondary throttle plates and they were misaligned slightly. I have about a .026 clearance between the linkage and the secondary lever. After I made the adjustments, the idle quality is better, however I am still having the same problem, high idle after the secondaries are activated.

Out of a little frustration and curiosity I tried a differant set of secondary metering rods I have. With the original BG rods I get high smooth idle around 1200 rpm now. I put in a pair of CP rods and the idle is lower around 950rpm and a little radical.

At this point I am thinking I will have to take the carburetor apart and measure all the restrictions to get a better understanding of what is going on.

Cliff Ruggles:
If secondary metering rods have any effect on idle quality at all, then the secondaries are open far enough to pull in air, and fuel from the nozzles.

Go back and make sure thay are FULLY seated.  Most likely the shaft is twisted slightly, and/or they are out of alignment, or both......Cliff

runnerguy:
Hello, Just wanted to give an update on my idle problem, or lack of one now. After my last post I checked again to make sure secondaries were fully seated, and they appeared to be. But I did notice the the bores and throttle plates were slighty rough and not as smooth as I thought they should be. So I polished both the secondary bores and the edges of the throttle plates with 1000 grit sand paper, and realigned the plates in the bores. I have no more high idle problems now. Just want to thank all you guys for your help.

Dave

Cliff Ruggles:
Good news!....Cliff

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