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Old 12-04-2002, 06:54 AM   #1 (permalink)
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More carb prob's

Ok, so which screw on the rochester quadrajet carb is the air/fuel, and which one is the idle speed screw on this 85 wranger 4by. And is the carb screwed if I'm not getting vacuum out of the little one near the bottom front passenger side? and the big one on the driver's side? I have the distrib. advance connected to the little one at the top cuz it has vacuum, maybe it's giving to much? I haven't messed with the screw's again yet but I'm gona try 3.5 outa again see how good she run's. Also is lithium grease good fer in the distributer cap?
where the hell do I hookup the vacuum gauge to check the vacuum, carb or manifold?



thanks again everyone
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Old 12-04-2002, 02:06 PM   #2 (permalink)
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Any idea what year the carb is? Or what it come off of. Some of the last Q-jets didnt allow you to mess with these unless you pulled some plugs out.


Idle screw is on the drivers side of the carb.
Mixture screws, 2 of them, are on the front of the baseplate on out toward the sides. They are at an angle, pointing outboard slightly.
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Old 12-04-2002, 07:22 PM   #3 (permalink)
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OK Great

so the two air/fuel screws on the bottom of the carb pointing outward's are air fuel... which is which or are they both the same? the carb is rochester quadrajet off of a 86 k-5 blazer with a 305 in it. I have it on my 350. I really need to setup this carb I can't even matt the gas peddle or it sound's like the truck is gona DIE... just at regular driving speed's it has no power.... I press the gas and it goes to say 2200rpm, I hold the gas where it was and it will drop to say 2000 or 1900 rpm in like 2 or 3 sec's after I press the peddle. Hmmmmmph I should buy a book on quadrajet's!
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Old 12-04-2002, 07:58 PM   #4 (permalink)
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Check the fuel filter inside the carb, could be gummy. Also check to be sure the choke isn't staying closed. Finally, check your timing, and be sure the timing is hooked up to one of the ports on the bottom of the carb. Not the top. Good Luck. They can be a pain to tune, but once done, nuthin beats a quadrajet! (Except maybe TPI or Ram jet, but ya know....)
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Old 12-04-2002, 09:39 PM   #5 (permalink)
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You have to adjust them both. Alternating between the two. I usually start at 1 1/2-2 turns out. Would take me forever to type all this so go here http://www.corvettefaq.com/c3/myqjet.htm lot of good info. Also try google and type in Quadrajet.
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Old 12-08-2002, 07:40 PM   #6 (permalink)
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carb

the best thing you could do is to go buy a holly and throw that quadrjet as far as you can
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Old 12-08-2002, 07:46 PM   #7 (permalink)
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yeah go buy a holley, you'll be limited to mostly flat ground, but it'll run good on a level road

-scott
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Old 12-08-2002, 08:00 PM   #8 (permalink)
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Re: carb

Quote:
Originally posted by MYNAMESUCKS
the best thing you could do is to go buy a holly and throw that quadrjet as far as you can
Now thats funny !
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Old 12-08-2002, 09:43 PM   #9 (permalink)
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Keep the quadrojet, and use the holley for a doorstop....Holleys and Edelbrock peformers are for street wheelers!
Quadrojets are the Best stock carb there is for offroad, and they are easy to adjust and rebuild. Get a book, it will tell you everything you need to know!
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Old 12-08-2002, 10:26 PM   #10 (permalink)
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Quote:
Originally posted by 6869704x4
You have to adjust them both. Alternating between the two. I usually start at 1 1/2-2 turns out. Would take me forever to type all this so go here http://www.corvettefaq.com/c3/myqjet.htm lot of good info. Also try google and type in Quadrajet.

This place is great for info....
I just changed my engine to a stroker and have not been able to figure out why my idle adjustments suck. and there was some info about that on the page..
Can't wait to break out the drill and fix this problem..
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Old 12-08-2002, 10:41 PM   #11 (permalink)
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now what about the holley truck avenger carb. it only puts out 670 cfm though. and if you have a motor over 400 c.i. it wont work. but it has flood free operation at a 40*incline and 30* side hill maneuvers and nose down desents. also it is pretty much bolt and go. im getting one when i get the cash. also i heard edelbrock has an off road carb out also but i dont know much about it.
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Old 12-11-2002, 12:51 PM   #12 (permalink)
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The Holley Truck Avenger will work fine on a mild 400, I even know someone who used one on a 500 Caddy. But, the q-jet is still better, both Edelbrock and JET Performance sell good ones.
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