Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

high rpm issue on rebuild quadrajet

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rytari:
hi ppl.

i have 17059218 quadrajet on top of edel performer in my 86 camino 305.. idle was poor and exhaust smelled bad, running rich at idle + worn out primary shaft holes in baseplate, it had terrible bogging when warm and off idle stumble when cold...

last week i got some rebuild kit for some local shop here.

all parts were cleaned, i took baseplate, check for straightness and fit bushing to primary shaft.

now when everything is back together and carb fitted back on intake.. but.


cold engine, with choke it runs fine,  raised rpm of course, and when fast idle cam drops it will start to run some decent 7-800 rpm, little unstable maybe, trans in gear it almost dies and after driving some mile or so ill get 1500-200 rpm and wont go down. or road it works fine, not any hesitation, not any stumble, motor is pulling much much better.

i cannot get it lower, than 1000 rpm when hot, idle adjust screw wont even touch the primary shafts lever, mixture screws wont affect nearly anything... without air cleaner i managed to get it running some 7-800 rpm again but idle is very unstable,  it can die any time or just changes rmp constantly.

choking primaries with my hand causes also rpm increase up to 2000 rpm for a moment

-i have tried change float level
- car will run still if idle mixture screws are bottomed
- spraying brake cleaner around the carb and intake wont make big difference
- initial advance adjust wont give me any help. 


i don't have any idea where to start.

 


 

rytari:
it seems that even you guys got nothing to suggest...

429bbf:
if i was to take a EWAG id say you didnt get your primary plate seeded in the bore square when you put bushings in. now your carb is sucking air past the primaries and not pulling fuel. did you look up into the light when you installed the throtte plates? are they about light free?dean

rytari:
i centered both plates to the bore as good as i could, shaft is closing but i didnt use any auxilary light to look trough it, only raised against the sky and try to see trought but for my eyes that way those close well and not any gap between bore and plates could be seen.

Shark Racer:
Are you positive that you don't have vacuum leaks anywhere else?

I would start by capping all the connections on the carb and seeing if that helps.

Also, make sure the manifold is sealing well and that any vacuum ports on the intake are sealed well. I had a problem recently with my car running lean due to an NPT vacuum tee fitting that was not seated well on the 5-7 runner.

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