Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Idle problem
Cliff Ruggles:
Is your problem coming off idle at very light throttle openings or going quickly to heavy throttle?
Two different scenarios as "normal" driving doesn't use the accl pump or PP for enrichment.
More bypass air would simply add more air to lower the throttle angle but not add any more fuel anyplace......Cliff
Cliff Ruggles:
Something that just came to mind was that carb every commercially "remanufactured"?.....
dlphil10:
I don't belive it was ever commercially remanufacturered. What would be something to look for to indicate that?
The problem is a bog at practically all off idle. I think it's worse at light throttle. There's a slight grade to climb as I back around in the drive way. When I go to put it in drive to go up the hill it stumbles and I have to give it gas to pick rpms back up.
On the idle bypass I was wondering if I don't have enough off idle enrichment from being far into the transfer slot.
Cliff Ruggles:
Most commercially "remanufactured" carburetors are mixed/matched parts and all the finish typically gone from them.
The mixing/matching is what gets you into troubles.
If and when EVERYTHING inside is correct for what you are doing, and there are still issues, time to look for fundamental problems like the wrong power piston (very common with anything commercially remanufactured). Not using the original top and bottom will also cause running issues.
Arms bent on the power piston causing the metering rods to be too deep in the jets, etc......Cliff
dlphil10:
Do you have a list that shows what number air horn and throttle plate should be with the 7029262 to verify?
I tweaked valve timing and ignition timing and now it idles in drive at 14.5inhg. The plugs are only faintly tan as shown in the attached. This is too light isn't it? This was with the mixture screws out 4 turns. I was thinking maybe I should open the DCRs to 0.055 if that would help.
I also was thinking of changing to the light blue power piston spring to get more gas off idle. What do you think?
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