sbc350 quadrajet idle stuck at 2700 rpm ??? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 12-24-2009, 05:02 PM   #1 (permalink)
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sbc350 quadrajet idle stuck at 2700 rpm ???

seems like a newb question to me. like the title says my idle has gotten stuck at 2700 rpm.. i have a rochester Qjet on it. i'm guessing the problem is the carb somehow as the idle seems excessive for a vacume leak (which i checked for). and i did look at the dizzy weights just in case.... so the carb gets trashed everysummer with the thick dust on the norcal trails rubicon etc. so its due for a good tear down. i've checked all the linkage , return springs etc as best as i can . just wondering if there is anything in a q-jet that could go south enough to cause this.....been doing this stuff for along time and have never had this happen . help??

i searched with no luck so for whoever was thinking it
thanks
glenn
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Old 12-26-2009, 03:08 AM   #2 (permalink)
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Check the linkage on the side where the choke is. I have a older qjet with a Manuel choke and i had to zip tie the weighted part down
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Old 12-26-2009, 06:45 AM   #3 (permalink)
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If you didn't live in california I would say this is a normal problem when it's -30 to -40 degrees, but I can't help now.
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Old 12-26-2009, 11:53 AM   #4 (permalink)
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secondary linkage hung open?
it is spring loaded
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Old 12-26-2009, 02:04 PM   #5 (permalink)
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i opened the flap above the secondaries to see if the the throttle was seated and it looks like it is , but the flaps arent what i would call flat, when they are seated are they at a slight angel ?-- not flat , same plain as the bottom of the throttle body. anyway i'm a two hr drive from my rig so anything i might need to check will have to waite till thurs
thanks again
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Old 12-26-2009, 03:50 PM   #6 (permalink)
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Sounds like the choke is on. If its electric, make sure it is still plugged in and getting 12 volts with the key on.
If its manual, see if some squirrels have been busy packing stuff on the intake.

Get it started, and move the weights as mentioned above downward (yellow arrow pointing to it in the pic)(its a stepped plate/linkage, you'll feel it when you move it. When you press the accelerator down before a cold start your setting the choke and the choke spring will pull this up to whatever high idle setting you have). If the idle drops down you know for sure its choke related.



Alex.
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Old 12-26-2009, 07:29 PM   #7 (permalink)
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thanks alex that is a great description....... thurs when i go back up i'll be checking that out.
never seen a red carb!

btw mine is an electric choke like that one too
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linking the rear
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Last edited by rockthedog; 12-26-2009 at 07:32 PM.
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Old 12-27-2009, 09:32 PM   #8 (permalink)
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There is also an outside chance that you lost one of the butterfly plate
(a.k.a. throttle blade ) screws. with engine off, look down venturis to see
if the throttle plates are centered.
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Old 01-01-2010, 12:06 AM   #9 (permalink)
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Quote:
Originally Posted by GMGuy View Post
Sounds like the choke is on. If its electric, make sure it is still plugged in and getting 12 volts with the key on.
If its manual, see if some squirrels have been busy packing stuff on the intake.

Get it started, and move the weights as mentioned above downward (yellow arrow pointing to it in the pic)(its a stepped plate/linkage, you'll feel it when you move it. When you press the accelerator down before a cold start your setting the choke and the choke spring will pull this up to whatever high idle setting you have). If the idle drops down you know for sure its choke related.



Alex.

that was it! the weight was stuck in the up position. pushed it down and it idles perfect. i will test later to see if the choke is faulty or just out if adjustment.
thanks again
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www.wfoconcepts.com 530-268-9494

tlca# 12281
semi_budget 1ton build
http://www.pirate4x4.com/forum/showthread.php?t=530636

linking the rear
http://www.pirate4x4.com/forum/toyot...king-rear.html
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