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Old 02-08-2024, 04:26 PM   #1
chevrolet
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Default Q-jet problem

Have an 85 chevy 1 ton pickup with 454 and the q jet runs good but,,, it's always ben rich on idle .It will drive you out of the shop. Had the truck since new just never messed with it because dont know enough about them as far as rejecting them plus it runs good with it. Any one know of someplace I could get help with this thing. Its all stock.Ive rebuilt it a couple of times and done the little things I do know.Thanks Much...DR.
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Old 02-09-2024, 12:27 PM   #2
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Default Re: Q-jet problem

Find an old carb man and have the chock checked.
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Old 02-10-2024, 09:26 PM   #3
Mark Yacavone
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Default Re: Q-jet problem

You removed the idle mixture screw seals, right?
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Old 02-11-2024, 06:12 AM   #4
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Default Re: Q-jet problem

fuel leaking out jet well plugs.
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Old 02-11-2024, 02:23 PM   #5
Mark Yacavone
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Default Re: Q-jet problem

Quote:
Originally Posted by Terry Cain View Post
fuel leaking out jet well plugs.
That stopped in the late 60's with a different process to install and seal the plugs.
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Old 02-24-2024, 12:11 PM   #6
REGGIE WINKLES
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Default Re: Q-jet problem

Mark is correct about the base plugs. The later Rochester Q-Jets don’t leak. Try leaning with it with the mixture screws. Also check for a “sunk” float.
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Old 03-08-2024, 03:20 PM   #7
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Default Re: Q-jet problem

Are you sure it's rich & not lean? Eye burning is lean, if not just gassy could be rich.
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Old 03-10-2024, 09:33 AM   #8
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Smile Re: Q-jet problem

Quote:
Originally Posted by chevrolet View Post
Have an 85 chevy 1 ton pickup with 454 and the q jet runs good but,,, it's always ben rich on idle .It will drive you out of the shop. Had the truck since new just never messed with it because dont know enough about them as far as rejecting them plus it runs good with it. Any one know of someplace I could get help with this thing. Its all stock.Ive rebuilt it a couple of times and done the little things I do know.Thanks Much...DR.
Good morning to all,
Maybe you just need to lean the Primary metering rods one or two numbers.
I'm sure the carb can't be that far off metering wise if you've owned this vehicle and someone else didn't get inside and "Fix " something? I'd get it apart and look at the number stamped on the rod, if it's a 41 try a 42 or 43 primary rod.
Does that carb have an Adjustable Part Throttle screw? You can try turning the screw clock wise in small increments and then drive the truck. You might want to check your ignition timing and get a vacuum gauge on this also and monitor what's going.
You've got a couple of things to look at, best of luck on your adventure.

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Old 03-10-2024, 03:03 PM   #9
Mark Ruset
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Default Re: Q-jet problem

Quote:
Originally Posted by chevrolet View Post
Have an 85 chevy 1 ton pickup with 454 and the q jet runs good but,,, it's always ben rich on idle .It will drive you out of the shop. Had the truck since new just never messed with it because dont know enough about them as far as rejecting them plus it runs good with it. Any one know of someplace I could get help with this thing. Its all stock.Ive rebuilt it a couple of times and done the little things I do know.Thanks Much...DR.
It may be possible since you mentioned that the carb has been rebuilt a few times that the overhaul kit used may be incorrect. i would start with a new quality overhaul kit specifically. Designed for your year make and model. Try and locate a Delco overhaul kit. I had good luck using Quadrajetparts.com for all parts and gaskets.
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Old 03-10-2024, 03:24 PM   #10
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Default Re: Q-jet problem

Cliff has good parts too.
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