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I want to know how to adjust Rochester Quadrojet carb

Just rebuilt but still doesnt run right

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I've always screwed the air flow screws on the bottom plate all the way in,then start screw them out 2 half turns and up them there half turn at a time

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

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SOURCE: 1984 chevy s10 2.8l rochester carberator.

check all the vacuum lines and make sure there are no leaks, i had the same problem an thats all it was

Posted on Jan 08, 2009

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SOURCE: Where is the idle screw on a Rochester Varajet carb?

Its located behind the linkage on carb. left side.it will have a little spring behind it.

Posted on Apr 20, 2009

  • 170 Answers

SOURCE: new rebilt carter yfa installed, but idle at 3k

The 2.5 L engine is the Pontiac Iron Duke sourced from GM since it was still AMC. They came with Rochester carbs, while Ford used Holley 2 brls on their 4 cyl engines and Chrysler used Carter carbs. You might have the wrong carb and the throttle plates are sticking on the intake manifold. You can try using a carb adapter/spacer. If you drive off road I would suggest buying a TBI throttle body injection system from a junkyard, and pick up a electirc fuel pump. Either new from a speed shop or used from a newer Jeep with a 2.5 L TBI engine, you'll need the computer, harness, relay, sending unit and lines as well. But you can pick up everything at a pick your part yard for cheap (some yards have all you can carry in your hands for $50 days).

Posted on Jul 27, 2009

  • 733 Answers

SOURCE: What are the specs for adjusting MC solenoid,lean

typically it's close the screw(s) then open them one and a half turn.

Posted on Sep 15, 2009

daves944
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SOURCE: my 1985 chevy 305 gets 4mi to the gallon

Check your ignition timing at 3500 rpm you should have about 40 degrees of advance If not, something is sticking in the distributor, either the vacuum or mechanical advance. This will cause a big reduction in fuel economy. Also, check your tire pressure. The cfm on a rochester is really not important. The primary bores are so small and they are the only thing allowing the mixture in most of the time.

Posted on Jan 29, 2010

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3 Answers

I have an 81 Chev with a 350w/ q-jet carb. Their are no screws for air/fuel mix. It has only the plugs. Is there a way to adjust the mix w/o having to remove the plugs, tap and install new screws?


How to Adjust Fuel and Air Mixture On A Carburetor By ...

? 5:54
https://www.youtube.com/watch?v=39Wcbp6_yNQ
Feb 23, 2014 - Uploaded by TheWhatisright Hopcorvetteman
It is a standard 350 Chevy with no real modification. .... missing something or can they be in a different location on my carb ( 81vette rochester quadrojet ). ... There are two fuel mixture adjustments on the rochester Carburetor.

Nov 26, 2015 | Chevrolet Cars & Trucks

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89 cadi chokes/floods itself out


have an accredited service shop do a carby check as it could be a float level to high, incorrect mixture adjustment or power valve /pump incorrectly fitted
black smoke is excessive fuel and a rebuilt carby, if done by a DIY, is always suspect

Nov 28, 2017 | 1989 Cadillac Brougham

1 Answer

Just rebuilt the engine and carb and can't seem to find the right adjustment to keep it off high idle


sure its not running on autochoke ,sounds like it to but if you have done a nice job on the engine then you may need to adjust the mixture on idle which for the inspection must be less than 2% it will idle well if this higher as its burning more fuel on idle but this is not allowed for the test ,once it leaves the test station ? This has one of them fish type carbs and havent done one for many a year but the mixture idle is on the base of the carb and they normally have a spring on the screw shank to hold them

Mar 25, 2012 | 1990 Mazda B-Series

1 Answer

Excess fuel consumption


I would like to know what is the running tempreature of the vehicle, if the engine is running cold at all times then the computer will dump gas thinking the engine will die, check the O2 sensors and see if they are in range, also check the fuel pressure and it should be in specs last time to look into is the fuel pressure regulator. I hope the air filter is replaced.

Dec 04, 2011 | Cars & Trucks

1 Answer

My 1985 chevy 305 gets 4mi to the gallon


Check your ignition timing at 3500 rpm you should have about 40 degrees of advance If not, something is sticking in the distributor, either the vacuum or mechanical advance. This will cause a big reduction in fuel economy. Also, check your tire pressure. The cfm on a rochester is really not important. The primary bores are so small and they are the only thing allowing the mixture in most of the time.

Jan 29, 2010 | 1985 Chevrolet C1500

1 Answer

New rebilt carter yfa installed, but idle at 3k all adjustment screws backed out, ? the 2.5 L 4 cylinder came from P O with a jury rigged rochester carb of 77 ford vintage, hard to start so I got the...


The 2.5 L engine is the Pontiac Iron Duke sourced from GM since it was still AMC. They came with Rochester carbs, while Ford used Holley 2 brls on their 4 cyl engines and Chrysler used Carter carbs. You might have the wrong carb and the throttle plates are sticking on the intake manifold. You can try using a carb adapter/spacer. If you drive off road I would suggest buying a TBI throttle body injection system from a junkyard, and pick up a electirc fuel pump. Either new from a speed shop or used from a newer Jeep with a 2.5 L TBI engine, you'll need the computer, harness, relay, sending unit and lines as well. But you can pick up everything at a pick your part yard for cheap (some yards have all you can carry in your hands for $50 days).

Jul 27, 2009 | 1985 Jeep Cherokee

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