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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: mountaindrew on May 01, 2010, 08:51:55 am

Title: Quadrajet problems
Post by: mountaindrew on May 01, 2010, 08:51:55 am

I adjusted my idle yesterday with a vacuum gauge and got a good idle and highest vacuum when the idle screws were fully seated.  I was getting about 18.5" on my vacuum gauge and was holding steady.  I sprayed some carb cleaner around the base of the carb and vacuum hoses to try to find a leak.  The only place I found of was when I sprayed some around what looks like the throttle linkage bearing place on the driver side of the carb.  But the engine choked out when I sprayed cleaner there, instead of picking up speed like I thought it would.  I think something's not quite right.  Guidance please?

Title: Re: Quadrajet problems
Post by: Captkaos on May 01, 2010, 11:15:34 pm

It the throttle shaft loose?
you probably need to bushing the shaft.  I would imagine it would be a bad leak if the needles are seated.

Title: Re: Quadrajet problems
Post by: mountaindrew on May 02, 2010, 09:07:47 am

It has some noticeable play in the shaft area.  Do you know if the bushing come in the standard local part store rebuild kit? Also I tried to adjust the idle down from 1000 to around 800.  The screw was backing out but the idle throttle plate wouldn't come back any more.  There was a gap between the  screw and bump stop. Any adjustment for that?

Title: Re: Quadrajet problems
Post by: jaredts on May 02, 2010, 11:21:00 am

Bushing kits can be found online.  I don't think you can get one at a parts store.  You're probably just as well to use it as a core for one that has been rebuilt.  They usually have been bushed and are better than new.  You can do it yourself with a drill press and the kit if you choose.

Title: Re: Quadrajet problems
Post by: mountaindrew on May 02, 2010, 02:21:13 pm

Thanks for the help.  Where do y'all like to get your reman, ready to drive Quadrajets from?  Is there a preferred or recommended vendor?  I am eyeballing this site http://www.guaranteedcarbs.com/?gclid=CMDR_YKbtKECFRRM5Qod0QigAw (http://www.guaranteedcarbs.com/?gclid=CMDR_YKbtKECFRRM5Qod0QigAw) because of the price and the monkey  ;)

Title: Re: Quadrajet problems
Post by: VileZambonie on May 02, 2010, 04:06:56 pm

Find out if the core requires a matching number.

Title: Re: Quadrajet problems
Post by: mountaindrew on May 03, 2010, 12:10:20 am

http://www.guaranteedcarbs.com/cgi-bin/shopper.cgi?preadd=action&key=CTMHT4663   "...During checkout, there will be a section to enter your number and vehicle information when ordering this remanufactured carburetor. Our staff will use this information to ensure you receive the exact carburetor...."

I guess they want MY carb back.  Maybe now would be a good time to install a Weiand peanut port intake!

Title: Re: Quadrajet problems
Post by: Captkaos on May 03, 2010, 10:39:56 am

I would call and verify.  I have picked up rebuilt ones from local parts stores for luck.