Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

carb adjustments

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Old 10-09-2006, 10:39 PM
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Car: 1987 Camaro,'89 firebird
Engine: 305 quadjet, 305 tbi
Transmission: 700r4
Axle/Gears: 2.73. 3.2xs
to make adjustments on the carb.
Old 10-09-2006, 10:50 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
alright so i got a good deal on the carb its just a gas gusler...and what do you mean by give it a shot first?

Last edited by xgtharo86x; 10-09-2006 at 11:04 PM.
Old 10-10-2006, 12:00 AM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
What do you mean by it's just a gas guzler?

You need torx bits to disassemble the q-jet. Chances are you'll need to open it up to rebuild it, or swap in jets/rods, and some point.

Give it a shot. Bolt it onto your engine (the manifold can wait, or you can do both at the same time...), and see how it runs. You'll need to set the idle speed, and probably idle mixture. Then try driving it around town. See if you bog is gone, see how it runs, etc etc.

I'd only do the carb (not the manifold), since you *might* induce a vacuum leak if you screw up on installing the manifold, and you'll spend months chasing a "carb" problem, when it's the manifold. So, one adjustment at a time makes tuning easier.

You'll need a carburetor mixture adjustment tool. It's a handle, with a 2' long flexable neck, then a bit holder. It'll come with about 5 different bits for different carbs, you'll only use the "double D" one for the q-jet. That's how you set your idle mixture, along with a vacuum gauge.
Do a search on the forums here for "setting q-jet mixture", or idle mixture, or... you get the idea. You're probably going to want to learn some stuff about that carb.
Old 10-10-2006, 02:53 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
the carb is set for the high rise intake .....is there a pattern to tighten the intake bolts
Old 10-10-2006, 03:45 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
the carb is set for the high rise intake
I don't know what you mean by this.

Yes, tighten them from center outwards. There's probably a picture in your haynes manual, but go left-right-left-right, from center, outwards. If in doubt, this is always the way to do it.
Old 10-10-2006, 03:54 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
the carb is tuned for high rise intake
Old 10-10-2006, 03:57 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
How or why do you think that? Are we talking about the q-jet still?
Old 10-10-2006, 07:34 PM
  #58  
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
because the Q jet was on the intake it was all off of the same engine
Old 10-10-2006, 07:56 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
That intake (edelbrock performer) isn't a high rise.
And that makes no sense anyway.
Old 10-10-2006, 08:14 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
oo its a lil higher but it was running on that car soo its most likely tuned i hope... so the computer lock up only works when the cars in 4th or overdrive
Old 10-11-2006, 12:18 AM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
I think so. Not my area of expertise, i'd ask for suggestions on the tranny forum as for choices.
Old 10-11-2006, 12:44 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally Posted by xgtharo86x
oo its a lil higher but it was running on that car soo its most likely tuned i hope... so the computer lock up only works when the cars in 4th or overdrive
Mine will lock up in 2nd or 3rd if the vehicle speed is above 41 mph and the engine load is low.

The carb wasn't tuned to the intake manifold, it was tuned to the engine (assuming it actually was tuned).
Old 10-13-2006, 10:37 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
what are the torque specs for the intake manifold and carb
Old 10-13-2006, 11:28 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
intake is around 35ftlbs or so. Go in the pattern like mentioned.
Carb is just snug it up. Not too tight or you'll warp it.
Old 10-15-2006, 10:32 AM
  #65  
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
thanks guys for all your help yesterday i installed the intake and carb and it started rite up....i think it needs 2 be tuned because there is to much fuel getting put in how do i adjust the carb..and it still bogs

Last edited by xgtharo86x; 10-15-2006 at 10:45 AM.
Old 10-15-2006, 11:31 AM
  #66  
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Here's some tuning info.

https://webdisk.ucalgary.ca/~jmknopp...ning_Paper.doc

https://webdisk.ucalgary.ca/~jmknopp...leshooting.doc

https://webdisk.ucalgary.ca/~jmknopp...owerPiston.doc

Have fun.
Old 10-15-2006, 12:54 PM
  #67  
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
thanks man my carb gasket is leaking so i bouht a new 1 and its really thin then the stock 1 is that ok and my idle keeps change on its own and i keep adjusting it to 1
Old 10-16-2006, 12:45 AM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
oh, forgot about this thread.

yea, your idle speed is changing 'cuz you have a vacuum leak.

the carb gasket, you mean the one below the carb? Should be ~1/4" thick, if not, get another one. Might as well get a rebuild kit, $30 or so. It'll have that gasket in it, and a bunch of other parts that you may be needing in the near future.
Old 10-18-2006, 12:47 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
i got a new gasket and tuned the carb and i got a lil more power but not alot and it still bogs i dont no what the bogging could be besides the fuel pump..and what should 1 do next to the motor thanks for all your help
Old 10-18-2006, 06:49 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
You don't do anything to the motor until the carb is running perfectly.

First, what is your timing at idle, and WOT timing? Use a timing light, and find out. Use timing tape. This will give you more power.

2nd - re-set your air valve spring tension first. Post what your secondary rod and hanger combination is. This will probably fix your bog.
Old 10-18-2006, 10:27 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
i dont get the above but if im standing in front of my car and look at my carb at the adjustment screws what 1 is the fuel and what 1 is air
Old 10-18-2006, 10:37 PM
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
It's not that simple, there is no "air screw" and "fuel screw".

So, again, set up your timing.
Then set the air valve tension.
look on the main page of TGO for the how to article.
Old 10-18-2006, 10:48 PM
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Car: 86' Trans am
Engine: 85 LG4-non cc carb(building a 350)
Transmission: Rebuilt 700R4,vette servo,2200stall
Axle/Gears: 2.73 Posi
how much do you think a.shop will charge 2 tune it and i dont get The timing thing i did that already didnt i
----------
o and where is the air valve spring

Last edited by xgtharo86x; 10-18-2006 at 10:52 PM. Reason: Automerged Doublepost
Old 10-19-2006, 01:00 AM
  #74  
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Seriously guy! I can't spoon feed this to you! Check the main page of TGO, and find the TECH ARTICLE called AIR VALVE ADJUSTMENT
It has a picture of how to do it!

I doubt you'll find a shop willing to tune it for you, or else it'll be $200 or so. Maybe $60, who knows, depends on how thorough they are.

I don't remember what you did, but make sure you've checked the timing.
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