Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor

Very rich at light throttle and cruising

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Overcamber:
been working long hours/ hoping to get to it wed/thurs this week

thanks guys

Overcamber:
So I checked my vacuum advance and it won't hold a stitch of vacuum so tommmorrow I will be trying to locate one of those .  Today I picked up a new pole piece( ignition pickup) for in the distributor ( it tested ok but it won't last forever so now is the time to change it . ).  Also picked up a new fuel pump at the GM dealer as well .  I need to rule these things out as I proceed troubleshooting this issue .

Please add comments if you feel it will help me .

Thanks in advance .

Cliff Ruggles:
The vacuum advance is a big player here.  It adds timing at light throttle cruise to help burn a lean mixture and provide improved engine efficiency.  Without it performance will be poor and you will have running issues, poor fuel economy, etc.

Also check the mechanical advance to make sure it's working correctly........Cliff

Overcamber:
I'll be doing that today
Thanks again Cliff

Overcamber:
Well its been one hell of a bad/expensive day.    Started doing more t/s today and noticed the BrandNew choke pulloff on my carb is pooched> wont hold a stitch of vacuum> not sure what happenes now?? Cliff? I tested my old one and its still good so I put it on.

anyhow, this is what I've changed today and still have the same results:
new choke pulloff
new cap and rotor
new pickup coil
new vacuum advance
new plug wires
new spark plugs
new msd HEI coil
replaced 8 ft of vacuum line so every connection has a tight fit
tested every vacuum device under the hood to rule out any vacuum leak

$$$$$

was able to set the timing as per my emission decal,  suppose to be 6deg @550rpm in drive with vacuum advance disconnected and plugged... was able to do that but the truck is constantly missing and backfiring..i noticed with the timing light that it hits the timing mark for a couple beats but then the light flashes and the timing mark is gone??? did check the mechanical advance and it is in fact working.

next step is to check for garbage in the carb?..I don't know anymore?  any ideas?

tthanks

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