quadrajet carb

[Mudgrunt]

I can not get engine (350) to idle down, idles around 1800 and I have the idle screw backed away from the linkage does anyone have ideas.
thanks

[MR. Horsepower]

didi you unhook the throttle linkage to make shur it not hanging up and check the timing does it idle smooth that high or is it missing

[OLD SCHOOL]

check for vaccum leaks, & the secondary's are known to stick open part way grap the secondary linkage near the shaft & try to manually close it & see if it idles down

[old school truck dude]

Yup, also grab hold of the linkage where your throttle cable hooks up and wiggle it. Base plate is probably wore out.. You can get a rebuild kit for the base plate that has new bushings and stuff, if the butterfly shaft is grooved may as well toss it. Its very difficult to get the butterfly blades off the shaft without breakin the screws, so if the base plate has alot of slop to it may as well toss the carb and get another in better shape. The base plate is what kills these carbs. Has this carb ever ran correctly on this motor, or did you just now get it and put it on there..?

[Jjay78]

replace the q-jet with a holley or edelbrock.......fix other future probs that way too

[bigmud44]

short of dominater  properly tuned quadrajet will  perform as good or better than after market carb look @ any stock/super stock nhra-ihra racecar

[old school truck dude]

short of dominater  properly tuned quadrajet will  perform as good or better than after market carb look @ any stock/super stock nhra-ihra racecar

Yup! x2

[Mudgrunt]

thanks for the input carb was ideling around 800rpm's until we bumped the accelator to rev up it revved up and now will not come back down. Could this be because the base plate is bad? secondary are closed all the way. We noticed the primary blades are about half closed could this be caused by the spring on the choke not working properly? Idles smooth just idles high.
thanks again for the help.

[Captn. J]

mine re stuck at high too but check the rear flapper  and spring and stuff    wd40 em or whatever  over n over  they ll be fine unless yours re worn out... i m still wd40ing mine since when i full throttle it it ll get stuck at high throttle  just make sure evverything s not binding... it s easier to take it off and see

[old school truck dude]

thanks for the input carb was ideling around 800rpm's until we bumped the accelator to rev up it revved up and now will not come back down. Could this be because the base plate is bad? secondary are closed all the way. We noticed the primary blades are about half closed could this be caused by the spring on the choke not working properly? Idles smooth just idles high.
thanks again for the help.

Binding because the butterfly shaft bushings in the base plate are worn out, most likely

[72 Bogger]

short of dominater  properly tuned quadrajet will  perform as good or better than after market carb look @ any stock/super stock nhra-ihra racecar

x3

[85cHeavyMetalBogger]

well its my stuff we been talkn bout, just put on holly 600 i thnk, started but didnt have time to tune it. sumtin was wrng wit that q jet. dnt knw jack bout hollys, who knows....

[old school truck dude]

Theyre pretty simple, just a couple adjustments. Can be set up in a number of different ways dependin on what youre tryin to accomplish.. 

[Disturban]

short of dominater  properly tuned quadrajet will  perform as good or better than after market carb look @ any stock/super stock nhra-ihra racecar

x4 and get way better gas mileage!

[Ranger Dave]

a good qjet will work good for ya.   nothing wrong with them.

[Eroq]

choke sticking?

[old school truck dude]

choke sticking?

Could be that or might be idling on the fast idle cam instead of the idle screw

[nope]

short of dominater  properly tuned quadrajet will  perform as good or better than after market carb look @ any stock/super stock nhra-ihra racecar

yes they will but they have to be keep very clean

[redneck ohearn]

mine works good just got to keep it clean look at all the springs my stuck like your to until i played with the springs then it went back to normal